Viewing archive of Saturday, 27 April 2024
Solar activity report
Report of Solar-Geophysical Activity 2024 Apr 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 118 Issued at 2200Z on 27 Apr 2024IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M2 event observed at
27/1235Z from Region 3654 (S08W23). There are currently 9 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares on days one, two, and three (28 Apr, 29 Apr,
30 Apr).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 546 km/s at 27/1001Z. Total IMF reached 16
nT at 27/0612Z. The maximum southward component of Bz reached -9 nT at
26/2141Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 153 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (28 Apr) and quiet to
unsettled levels on days two and three (29 Apr, 30 Apr).
III. Event Probabilities 28 Apr to 30 Apr
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Apr 153 Predicted 28 Apr-30 Apr 140/135/135 90 Day Mean 27 Apr 163
V. Geomagnetic A Indices
Observed Afr/Ap 26 Apr 011/017 Estimated Afr/Ap 27 Apr 013/018 Predicted Afr/Ap 28 Apr-30 Apr 012/015-008/010-008/008
VI. Geomagnetic Activity Probabilities 28 Apr to 30 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 25% | 25% |
| Major-severe storm | 40% | 30% | 25% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/11/06 | X2.39 |
| Last M-flare | 2024/11/20 | M1.1 |
| Last geomagnetic storm | 2024/11/10 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| October 2024 | 166.4 +25 |
| November 2024 | 142.7 -23.8 |
| Last 30 days | 155.2 +4.4 |