Viewing archive of Monday, 20 May 2013
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 2013 May 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 140 Issued at 2200Z on 20 May 2013IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M1 event observed at
20/0525Z. There are currently 7 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a chance for X-class flares on days one, two, and three (21 May, 22
May, 23 May).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
493 km/s at 19/2257Z. Total IMF reached 14 nT at 19/2256Z. The maximum
southward component of Bz reached -5 nT at 20/1953Z. Protons greater
than 10 MeV at geosynchronous orbit reached a peak level of 4 pfu at
19/2255Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (21 May, 22 May)
and unsettled to active levels on day three (23 May). Protons have a
chance of crossing threshold on days one, two, and three (21 May, 22
May, 23 May).
III. Event Probabilities 21 May to 23 May
| Class M | 65% | 65% | 65% |
| Class X | 25% | 25% | 25% |
| Proton | 25% | 25% | 25% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 May 132 Predicted 21 May-23 May 130/125/125 90 Day Mean 20 May 121
V. Geomagnetic A Indices
Observed Afr/Ap 19 May 011/014 Estimated Afr/Ap 20 May 006/006 Predicted Afr/Ap 21 May-23 May 007/008-011/012-012/015
VI. Geomagnetic Activity Probabilities 21 May to 23 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 30% |
| Minor storm | 01% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 25% | 30% |
| Major-severe storm | 20% | 30% | 40% |
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| Last geomagnetic storm | 2024/04/16 | Kp5 (G1) |
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