Viewing archive of Saturday, 24 February 2018
Solar activity report
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 2018 Feb 24 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 55 Issued at 2200Z on 24 Feb 2018IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z
Solar activity has been at very low levels for the past 24
hours. There are currently 0 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
on days one, two, and three (25 Feb, 26 Feb, 27 Feb).
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 550 km/s at 23/2316Z. Total IMF reached 7
nT at 23/2256Z. The maximum southward component of Bz reached -6 nT at
23/2253Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 2614 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (25 Feb), unsettled to minor
storm levels on day two (26 Feb) and quiet to unsettled levels on day
three (27 Feb).
III. Event Probabilities 25 Feb to 27 Feb
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 24 Feb 068 Predicted 25 Feb-27 Feb 068/068/068 90 Day Mean 24 Feb 071
V. Geomagnetic A Indices
Observed Afr/Ap 23 Feb 011/015 Estimated Afr/Ap 24 Feb 009/010 Predicted Afr/Ap 25 Feb-27 Feb 011/014-018/024-009/008
VI. Geomagnetic Activity Probabilities 25 Feb to 27 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 35% | 20% |
| Minor storm | 15% | 25% | 05% |
| Major-severe storm | 01% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 25% | 20% | 25% |
| Major-severe storm | 50% | 65% | 20% |
All times in UTC
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| Last M-flare | 2025/04/01 | M5.6 |
| Last geomagnetic storm | 2025/03/27 | Kp5 (G1) |
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