Viewing archive of Wednesday, 21 July 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Jul 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 202 Issued at 2200Z on 21 Jul 2021IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
21/2005Z from Region 2845 (S15W61). There are currently 6 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low on days
one and two (22 Jul, 23 Jul) and expected to be very low with a chance
for a C-class flares on day three (24 Jul).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 543 km/s at 21/0811Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 274 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (22 Jul), quiet to minor
storm levels on day two (23 Jul) and quiet to active levels on day three
(24 Jul).
III. Event Probabilities 22 Jul to 24 Jul
| Class M | 05% | 05% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Jul 094 Predicted 22 Jul-24 Jul 094/092/090 90 Day Mean 21 Jul 078
V. Geomagnetic A Indices
Observed Afr/Ap 20 Jul 009/010 Estimated Afr/Ap 21 Jul 007/007 Predicted Afr/Ap 22 Jul-24 Jul 007/008-013/018-013/016
VI. Geomagnetic Activity Probabilities 22 Jul to 24 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 40% | 35% |
| Minor storm | 05% | 25% | 20% |
| Major-severe storm | 01% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 25% | 60% | 50% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/12/08 | X2.2 |
| Last M-flare | 2024/12/23 | M8.9 |
| Last geomagnetic storm | 2024/12/17 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
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| November 2024 | 152.5 -13.9 |
| December 2024 | 106.6 -45.9 |
| Last 30 days | 114.4 -44.3 |