Viewing archive of Sunday, 11 April 2010
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 2010 Apr 11 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 101 Issued at 2200Z on 11 Apr 2010IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z
Solar activity was very low. No flares occurred during
the past 24 hours. The solar disk was generally void of spots,
although there was some evidence late in the period for emerging
flux and possible new spot formation near S18E07.
IB. Solar Activity Forecast
Solar activity is expected to be very
low for the next three days (12-14 April).
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
The geomagnetic field was initially quiet but became unsettled at
mid-latitudes and active with some isolated storm periods at high
latitudes after a sudden impulse at 1305Z (5 nT in Boulder). The
sudden impulse followed observation of a weak shock at the ACE
spacecraft at 1215Z; velocity jumped from 380 km/s to about 450
km/s, and the total magnetic field increased from 4 nT to about 10
nT. The shock was followed by moderately enhanced southward field Bz
with values ranging between -3 nT to -8 nT. The shock was most
likely a result of the halo CME that was observed on 08 April. The
greater than 2 MeV electron flux at geosynchronous orbit reached
very high levels.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet with some unsettled periods for the first day
(12 April) as the current disturbance subsides. Activity is expected
to be quiet for the second and third days (13-14 April).
III. Event Probabilities 12 Apr to 14 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 11 Apr 075 Predicted 12 Apr-14 Apr 075/075/075 90 Day Mean 11 Apr 083
V. Geomagnetic A Indices
Observed Afr/Ap 10 Apr 003/003 Estimated Afr/Ap 11 Apr 007/010 Predicted Afr/Ap 12 Apr-14 Apr 007/007-005/005-005/005
VI. Geomagnetic Activity Probabilities 12 Apr to 14 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 10% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 05% | 01% | 01% |
All times in UTC
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