Viewing archive of Monday, 21 May 2007
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 2007 May 21 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 141 Issued at 2200Z on 21 May 2007IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity was very low. Region 956 (N03W32) is
decaying but continues to produce occasional B-class flares.
IB. Solar Activity Forecast
Solar activity is expected to continue
at very low levels. There is slight chance for a C-class flare from
Region 956.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic field was quiet with isolated unsettled periods. The
greater than 2 MeV electron flux at geosynchronous orbit reached
high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to range from quiet to minor storm levels. A weak CME
observed on 19 May may produce isolated unsettled to active periods
on 22 May. A high speed coronal hole stream will rotate into a
geoeffective position on 24 May and produce occasional active to
minor storm periods.
III. Event Probabilities 22 May to 24 May
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 May 073 Predicted 22 May-24 May 075/075/075 90 Day Mean 21 May 074
V. Geomagnetic A Indices
Observed Afr/Ap 20 May 006/006 Estimated Afr/Ap 21 May 005/012 Predicted Afr/Ap 22 May-24 May 005/008-005/005-010/015
VI. Geomagnetic Activity Probabilities 22 May to 24 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 30% |
| Minor storm | 01% | 01% | 10% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 40% |
| Minor storm | 05% | 05% | 20% |
| Major-severe storm | 01% | 01% | 10% |
All times in UTC
Latest news
Monday, 11 November 2024
Coronal hole faces Earth
Friday, 1 November 2024
X2.0 solar flare
Wednesday, 9 October 2024
X1.8 solar flare, severe geomagnetic storm watch
Latest forum messages
Filaments and prominences 477Ask your obscure/"stupid" space weather questions. 55Unspecified geomagnetic activity 1657iOS missing family sharing for in-app purchases 7Incoming & Unnumbered Active Regions 1212
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!
Space weather facts
| Last X-flare | 2024/11/06 | X2.39 |
| Last M-flare | 2024/11/13 | M1.7 |
| 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 | 166 -0.4 |
| Last 30 days | 164 +16.8 |