Meteorologia spaziale

Velocità del vento solare Vento solare dei campi magnetici Apice radioflusso a 10.7 cm
Bt Bz

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ALERT
Geomagnetic K-index of 4
Issued: 25.06.2017 08.13 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Jun 25 0813 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Issued: 25.06.2017 08.08 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Jun 25 0808 UTC
Valid To: 2017 Jun 25 1500 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 21.06.2017 06.52 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2610
Begin Time: 2017 Jun 19 1125 UTC
Yesterday Maximum 2MeV Flux: 2737 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: 20.06.2017 08.36 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2609
Begin Time: 2017 Jun 19 1125 UTC
Yesterday Maximum 2MeV Flux: 2735 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: 19.06.2017 11.40 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Jun 19 1125 UTC
Station: GOES13


Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: 18.06.2017 02.35 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3236
Valid From: 2017 Jun 17 2051 UTC
Now Valid Until: 2017 Jun 18 1400 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 4
Emesso: 17.06.2017 20.55 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Jun 17 2055 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Emesso: 17.06.2017 20.51 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Jun 17 2051 UTC
Valid To: 2017 Jun 18 0300 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Emesso: 16.06.2017 23.21 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Jun 16 2320 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: 16.06.2017 21.28 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3234
Valid From: 2017 Jun 16 0323 UTC
Now Valid Until: 2017 Jun 17 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Emesso: 16.06.2017 21.17 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1360
Valid From: 2017 Jun 16 0843 UTC
Now Valid Until: 2017 Jun 17 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Emesso: 16.06.2017 15.00 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Jun 16 1458 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: 16.06.2017 14.56 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3233
Valid From: 2017 Jun 16 0323 UTC
Now Valid Until: 2017 Jun 16 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Emesso: 16.06.2017 14.56 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1359
Valid From: 2017 Jun 16 0843 UTC
Now Valid Until: 2017 Jun 16 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Emesso: 16.06.2017 08.44 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Jun 16 0844 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Emesso: 16.06.2017 08.43 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Jun 16 0843 UTC
Valid To: 2017 Jun 16 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 4 expected
Emesso: 16.06.2017 03.24 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Jun 16 0323 UTC
Valid To: 2017 Jun 16 2100 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Emesso: 15.06.2017 19.34 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 16: G1 (Minor) Jun 17: None (Below G1) Jun 18: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: 12.06.2017 05.44 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3231
Valid From: 2017 Jun 11 1434 UTC
Now Valid Until: 2017 Jun 12 1400 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: 11.06.2017 20.27 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3230
Valid From: 2017 Jun 11 1434 UTC
Now Valid Until: 2017 Jun 12 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Emesso: 11.06.2017 18.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Jun 11 1759 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Emesso: 11.06.2017 17.35 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Jun 11 1733 UTC
Valid To: 2017 Jun 11 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Emesso: 11.06.2017 16.52 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Jun 11 1650 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Emesso: 11.06.2017 14.34 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Jun 11 1434 UTC
Valid To: 2017 Jun 11 2100 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CANCEL WATCH
Geomagnetic Storm Category G1 Predicted
Emesso: 04.06.2017 10.10 UTC
Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 786
Original Issue Time: 2017 Jun 03 1844 UTC

Comment: A decrease in solar wind enhancement has deminished the potential for G1 (Minor) geomagnetic storms.

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WATCH
Geomagnetic Storm Category G1 Predicted
Emesso: 03.06.2017 18.44 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 04: G1 (Minor) Jun 05: None (Below G1) Jun 06: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Emesso: 03.06.2017 16.46 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Jun 03 1645 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Emesso: 03.06.2017 13.32 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Jun 03 1330 UTC
Valid To: 2017 Jun 03 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: 03.06.2017 13.32 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3228
Valid From: 2017 Jun 03 1210 UTC
Now Valid Until: 2017 Jun 04 0300 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Emesso: 03.06.2017 12.08 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Jun 03 1210 UTC
Valid To: 2017 Jun 03 1800 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Type II Radio Emission
Emesso: 01.06.2017 02.15 UTC
Type II Radio Emission
Begin Time: 2017 Jun 01 0144 UTC
Estimated Velocity: 1459 km/s

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

ALERT
Geomagnetic K-index of 4
Emesso: 30.05.2017 06.01 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 May 30 0559 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Emesso: 30.05.2017 03.30 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 May 30 0330 UTC
Valid To: 2017 May 30 0900 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 4
Emesso: 29.05.2017 13.52 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 May 29 1348 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Emesso: 29.05.2017 13.21 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 May 29 1322 UTC
Valid To: 2017 May 29 2100 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Table

Data Radio flux 10.7 cm SESC Numero di macchie solari Zona macchie solari 10E-6 Nuove regioni GOES15 X-ray Bkgd flux Brillamenti
X-ray Ottica
C M X S 1 2 3
29.05.2017 76 16 180 0 B1.0 0 0 0 0 0 0 0
30.05.2017 74 0 0 0 A8.7 0 0 0 0 0 0 0
31.05.2017 74 11 30 1 B1.2 3 0 0 3 0 0 0
01.06.2017 76 18 60 0 B2.7 7 0 0 8 0 0 0
02.06.2017 78 19 200 0 B1.9 3 0 0 10 0 0 0
03.06.2017 78 22 180 0 A8.8 3 0 0 1 0 0 0
04.06.2017 78 23 130 0 A7.3 0 0 0 0 0 0 0
05.06.2017 79 22 170 0 A9.0 2 0 0 19 0 0 0
06.06.2017 75 18 130 0 A9.2 0 0 0 1 0 0 0
07.06.2017 76 13 40 0 A8.1 2 0 0 1 0 0 0
08.06.2017 74 12 10 0 A6.0 0 0 0 1 0 0 0
09.06.2017 74 0 0 0 A5.8 0 0 0 0 0 0 0
10.06.2017 75 0 0 0 A6.6 0 0 0 0 0 0 0
11.06.2017 74 0 0 0 A6.6 0 0 0 0 0 0 0
12.06.2017 75 0 0 0 A7.2 0 0 0 0 0 0 0
13.06.2017 75 11 170 1 A6.2 0 0 0 0 0 0 0
14.06.2017 74 11 160 0 A6.3 0 0 0 0 0 0 0
15.06.2017 77 28 150 1 A7.0 0 0 0 1 0 0 0
16.06.2017 74 28 140 0 A5.5 0 0 0 0 0 0 0
17.06.2017 75 28 170 0 A5.6 0 0 0 0 0 0 0
18.06.2017 75 27 160 0 A5.9 0 0 0 1 0 0 0
19.06.2017 74 26 140 0 A5.8 0 0 0 0 0 0 0
20.06.2017 74 34 170 1 A6.4 0 0 0 0 0 0 0
21.06.2017 74 35 120 0 A5.9 0 0 0 0 0 0 0
22.06.2017 74 23 80 0 A5.2 0 0 0 0 0 0 0
23.06.2017 74 22 90 0 A5.1 0 0 0 0 0 0 0
24.06.2017 74 28 80 0 A4.5 0 0 0 0 0 0 0
25.06.2017 74 20 90 0 A4.6 0 0 0 0 0 0 0
26.06.2017 74 19 90 0 A5.2 0 0 0 0 0 0 0
27.06.2017 74 17 100 0 A5.3 0 0 0 2 0 0 0
Media/Totale 75 18 101 4 20 0 0 48 0 0 0

Grafico riassuntivo

Brillamenti

Solar wind

Solar Wind

The solar wind is a stream of plasma released from the upper atmosphere of the Sun. It consists of mostly electrons, protons and alpha particles with energies usually between 1.5 and 10 keV. The stream of particles varies in density, temperature, and speed over time and over solar longitude. These particles can escape the Sun's gravity because of their high energy, from the high temperature of the corona and magnetic, electrical and electromagnetic phenomena in it.

The solar wind is divided into two components, respectively termed the slow solar wind and the fast solar wind. The slow solar wind has a velocity of about 400 km/s, a temperature of 1.4–1.6×10e6 K and a composition that is a close match to the corona. By contrast, the fast solar wind has a typical velocity of 750 km/s, a temperature of 8×10e5 K and it nearly matches the composition of the Sun's photosphere. The slow solar wind is twice as dense and more variable in intensity than the fast solar wind. The slow wind also has a more complex structure, with turbulent regions and large-scale structures.

Solar radio flux at 10.7 cm

Solar radio flux at 10.7 cm

The solar radio flux at 10.7 cm (2800 MHz) is an excellent indicator of solar activity. Often called the F10.7 index, it is one of the longest running records of solar activity. The F10.7 radio emissions originates high in the chromosphere and low in the corona of the solar atmosphere. The F10.7 correlates well with the sunspot number as well as a number of UltraViolet (UV) and visible solar irradiance records. Reported in “solar flux units”, (s.f.u.), the F10.7 can vary from below 50 s.f.u., to above 300 s.f.u., over the course of a solar cycle.

Flares

Flares

A solar flare is a sudden flash of brightness observed over the Sun's surface or the solar limb, which is interpreted as a large energy release of up to 6 × 10e25 joules of energy. They are often, but not always, followed by a colossal coronal mass ejection. The flare ejects clouds of electrons, ions, and atoms through the corona of the sun into space. These clouds typically reach Earth a day or two after the event.

Solar flares affect all layers of the solar atmosphere (photosphere, chromosphere, and corona), when the plasma medium is heated to tens of millions of kelvin, while the electrons, protons, and heavier ions are accelerated to near the speed of light. They produce radiation across the electromagnetic spectrum at all wavelengths, from radio waves to gamma rays, although most of the energy is spread over frequencies outside the visual range and for this reason the majority of the flares are not visible to the naked eye and must be observed with special instruments. Flares occur in active regions around sunspots, where intense magnetic fields penetrate the photosphere to link the corona to the solar interior. Flares are powered by the sudden (timescales of minutes to tens of minutes) release of magnetic energy stored in the corona. The same energy releases may produce coronal mass ejections (CME), although the relation between CMEs and flares is still not well established.

The frequency of occurrence of solar flares varies, from several per day when the Sun is particularly "active" to less than one every week when the Sun is "quiet", following the 11-year cycle (the solar cycle). Large flares are less frequent than smaller ones.

Classification

Solar flares are classified as A, B, C, M or X according to the peak flux (in watts per square metre, W/m2) of 100 to 800 picometre X-rays near Earth, as measured on the GOES spacecraft.

Classification Peak Flux Range at 100-800 picometer
W/m2
A < 10e-7
B 10e-7 to 10e-6
C 10e-6 to 10e-5
M 10e-5 to 10e-4
X 10e-4 to 10e-3
Z > 10e-3

An earlier flare classification is based on Hα spectral observations. The scheme uses both the intensity and emitting surface. The classification in intensity is qualitative, referring to the flares as: (f)aint, (n)ormal or (b)rilliant. The emitting surface is measured in terms of millionths of the hemisphere and is described below. (The total hemisphere area AH = 6.2 × 1012 km2.)

Classification Corrected area
(millionths of hemisphere)
S < 100
1 100 - 250
2 250 - 600
3 600 - 1200
4 > 1200

Sunspot number

Sunspots

Sunspots are temporary phenomena on the photosphere of the Sun that appear visibly as dark spots compared to surrounding regions. They correspond to concentrations of magnetic field that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere. Sunspots usually appear in pairs, with pair members of opposite magnetic polarity. The number of sunspots varies according to the approximately 11-year solar cycle.

Sunspot populations quickly rise and more slowly fall on an irregular cycle of 11 years, although significant variations in the number of sunspots attending the 11-year period are known over longer spans of time. For example, from 1900 to the 1960s, the solar maxima trend of sunspot count has been upward; from the 1960s to the present, it has diminished somewhat. Over the last decades the Sun has had a markedly high average level of sunspot activity; it was last similarly active over 8,000 years ago.

The number of sunspots correlates with the intensity of solar radiation over the period since 1979, when satellite measurements of absolute radiative flux became available. Since sunspots are darker than the surrounding photosphere it might be expected that more sunspots would lead to less solar radiation and a decreased solar constant. However, the surrounding margins of sunspots are brighter than the average, and so are hotter; overall, more sunspots increase the Sun's solar constant or brightness. The variation caused by the sunspot cycle to solar output is relatively small, on the order of 0.1% of the solar constant (a peak-to-trough range of 1.3 W/m2 compared to 1366 W/m2 for the average solar constant).

Indici K



Oggi


0h
UTC
3h
UTC
6h
UTC
9h
UTC
12h
UTC
15h
UTC
18h
UTC
21h
UTC
1



Data


Estimated Planetary

Estimated Planetary

Data A Indici K (UTC)
0h 3h 6h 9h 12h 15h 18h 21h
30.05.2017 7 2 4 2 1 1 1 1 1
31.05.2017 4 1 2 1 0 2 0 1 2
01.06.2017 7 1 1 1 1 1 3 2 3
02.06.2017 5 2 2 1 1 1 1 1 1
03.06.2017 9 0 1 2 2 3 4 2 1
04.06.2017 3 1 1 1 0 1 0 0 1
05.06.2017 5 1 2 1 1 2 1 1 2
06.06.2017 5 2 2 1 1 2 1 1 1
07.06.2017 5 1 2 2 1 1 1 0 2
08.06.2017 4 1 0 1 1 2 1 1 1
09.06.2017 5 3 1 1 1 1 1 1 1
10.06.2017 4 1 1 1 1 1 1 1 1
11.06.2017 17 1 2 3 2 3 5 4 3
12.06.2017 8 2 2 2 1 2 2 2 3
13.06.2017 8 3 2 1 3 1 2 2 1
14.06.2017 5 0 1 2 2 2 2 1 1
15.06.2017 4 2 1 1 1 1 1 1 0
16.06.2017 25 1 2 4 3 5 4 3 5
17.06.2017 15 4 4 2 2 2 2 4 3
18.06.2017 10 3 3 2 2 3 2 2 2
19.06.2017 5 1 2 2 2 1 1 0 1
20.06.2017 3 1 1 1 1 1 1 0 0
21.06.2017 4 1 1 1 1 1 1 2 2
22.06.2017 6 3 2 1 1 1 1 3 2
23.06.2017 5 1 1 1 2 1 1 2 2
24.06.2017 9 2 1 2 3 2 2 3 3
25.06.2017 11 2 2 4 3 2 2 2 2
26.06.2017 7 3 2 1 2 2 1 2 2
27.06.2017 5 2 2 1 1 1 1 0 1
28.06.2017 5 1

Middle Latitude

Data A Indici K
30.05.2017 6 2 3 2 1 2 1 1 0
31.05.2017 5 1 2 0 0 3 1 1 2
01.06.2017 6 1 1 1 1 2 2 2 3
02.06.2017 6 2 2 1 2 2 2 2 1
03.06.2017 9 0 1 2 2 4 3 2 2
04.06.2017 3 1 1 0 1 2 1 1 1
05.06.2017 5 0 1 1 1 3 1 2 1
06.06.2017 5 2 3 1 1 1 1 1 1
07.06.2017 5 1 2 2 1 1 2 1 2
08.06.2017 5 1 0 0 1 2 2 3 1
09.06.2017 6 2 1 0 2 3 2 2 0
10.06.2017 5 1 1 1 1 2 2 2 1
11.06.2017 14 1 2 3 2 3 4 4 2
12.06.2017 6 1 1 1 1 3 2 2 2
13.06.2017 6 2 2 1 3 2 1 1 1
14.06.2017 6 1 1 2 2 2 2 1 2
15.06.2017 5 2 1 1 2 2 2 1 0
16.06.2017 18 2 2 4 3 4 3 3 4
17.06.2017 12 3 4 1 2 2 2 3 3
18.06.2017 9 3 2 1 2 3 2 2 2
19.06.2017 7 2 3 2 2 2 1 1 1
20.06.2017 3 0 1 0 1 2 2 1 0
21.06.2017 3 0 0 0 1 2 1 2 2
22.06.2017 8 3 2 1 1 2 1 3 2
23.06.2017 6 1 1 1 1 3 2 2 2
24.06.2017 8 2 1 2 2 2 2 2 3
25.06.2017 11 2 2 4 2 2 2 3 2
26.06.2017 9 3 2 1 3 2 2 2 2
27.06.2017 5 1 1 1 2 2 2 1 1
28.06.2017 1

High Latitude

Data A Indici K
30.05.2017 4 2 3 1 1 1 0 1 0
31.05.2017 2 0 2 0 0 1 0 1 1
01.06.2017 3 0 1 0 0 1 2 2 2
02.06.2017 3 1 1 1 2 0 0 1 1
03.06.2017 20 0 0 1 3 5 6 2 1
04.06.2017 1 1 0 1 0 0 0 1 0
05.06.2017 3 0 1 0 1 2 2 1 1
06.06.2017 5 2 2 1 0 3 1 0 1
07.06.2017 5 2 2 2 2 1 1 0 1
08.06.2017 1 1 1 0 0 0 0 0 1
09.06.2017 1 1 1 0 1 0 0 0 0
10.06.2017 2 1 1 1 1 0 0 0 0
11.06.2017 9 1 2 2 1 2 4 3 1
12.06.2017 9 1 2 1 1 4 3 2 2
13.06.2017 7 2 1 1 4 1 2 1 1
14.06.2017 7 0 2 1 3 4 1 0 0
15.06.2017 3 1 1 0 2 0 0 2 0
16.06.2017 30 0 2 4 5 6 5 3 3
17.06.2017 17 4 4 2 3 4 3 2 2
18.06.2017 20 4 4 3 5 4 2 1 2
19.06.2017 12 2 2 2 5 4 1 0 0
20.06.2017 1 0 1 1 1 0 0 0 0
21.06.2017 1 0 0 0 0 0 0 1 1
22.06.2017 5 2 3 2 1 0 1 1 0
23.06.2017 7 2 1 0 4 1 0 2 2
24.06.2017 11 1 2 3 4 2 3 2 1
25.06.2017 24 3 4 6 4 4 2 1 1
26.06.2017 14 3 2 2 5 3 2 1 2
27.06.2017 5 2 1 1 2 3 1 1 0
28.06.2017 2

About

The K-index quantifies disturbances in the horizontal component of earth's magnetic field with an integer in the range 0–9 with 1 being calm and 5 or more indicating a geomagnetic storm. It is derived from the maximum fluctuations of horizontal components observed on a magnetometer during a three-hour interval. The label K comes from the German word Kennziffer meaning “characteristic digit”. The K-index was introduced by Julius Bartels in 1938.

The Estimated 3-hour Planetary Kp-index is derived at the NOAA Space Weather Prediction Center using data from the following ground-based magnetometers:

  • Sitka, Alaska
  • Meanook, Canada
  • Ottawa, Canada
  • Fredericksburg, Virginia
  • Hartland, UK
  • Wingst, Germany
  • Niemegk, Germany
  • Canberra, Australia

These data are made available thanks to the cooperative efforts between SWPC and data providers around the world, which currently includes the U.S. Geological Survey, Natural Resources Canada (NRCAN), the British Geological Survey, the German Research Centre for Geosciences (GFZ), and Geoscience Australia. Important magnetometer observations are also contributed by the Institut de Physique du Globe de Paris and the Korean Space Weather Center K-index Watches are issued when the highest predicted NOAA estimated Kp-indices for a day are K = 5, 6, 7, or >= 8 and is reported in terms of the NOAA G scale. K-index Warnings are issued when NOAA estimated Kp-indices of 4, 5, 6, and 7 or greater are expected. K-index Alerts are issued when the NOAA estimated Kp-indices reach 4, 5, 6, 7, 8, or 9.


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