Viewing archive of Thursday, 18 February 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Feb 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 49 Issued at 2200Z on 18 Feb 2021IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 1 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
on days one, two, and three (19 Feb, 20 Feb, 21 Feb).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 415 km/s at 17/2321Z. Total IMF reached 5
nT at 17/2355Z. The maximum southward component of Bz reached -4 nT at
18/0616Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 158 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (19 Feb), quiet to unsettled levels on
day two (20 Feb) and unsettled to minor storm levels on day three (21
Feb).
III. Event Probabilities 19 Feb to 21 Feb
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Feb 071 Predicted 19 Feb-21 Feb 071/071/071 90 Day Mean 18 Feb 082
V. Geomagnetic A Indices
Observed Afr/Ap 17 Feb 006/006 Estimated Afr/Ap 18 Feb 005/006 Predicted Afr/Ap 19 Feb-21 Feb 006/005-007/008-015/018
VI. Geomagnetic Activity Probabilities 19 Feb to 21 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 35% |
| Minor storm | 01% | 05% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 20% | 25% | 25% |
| Major-severe storm | 10% | 25% | 50% |
All times in UTC
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