Viewing archive of Saturday, 18 June 2011
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 2011 Jun 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 169 Issued at 2200Z on 18 Jun 2011IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity increased to low levels. Region 1234
(S16W61) produced occasional B- and C-class flares during the
period, the largest of which was a C3/Sn at 17/2342Z. Region 1234
showed an increase in interior spots and maintained a simple beta
magnetic configuration. Region 1236 (N17E18) showed a gradual loss
of trailer spots during the period, but maintained a beta-gamma
magnetic configuration. New Region 1237 (S15E53) was numbered early
in the period and was classified as a simple Axx-type. No
Earth-directed coronal mass ejections were observed during the
period.
IB. Solar Activity Forecast
Solar activity is expected to be low
through the period (19 - 21 June). There will also be a chance for
an isolated M-class flare during days 1 - 2 (19 - 20 June).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
Geomagnetic activity was at quiet levels through the period.
IIB. Geophysical Activity Forecast
Geomagnetic activity is
expected to remain at quiet levels on day 1 (19 June). Activity is
expected to increase to quiet to unsettled levels during days 2 - 3
(20 - 21 June), with a chance for brief active periods, due to a
coronal hole high-speed stream.
III. Event Probabilities 19 Jun to 21 Jun
| Class M | 20% | 20% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Jun 099 Predicted 19 Jun-21 Jun 100/100/095 90 Day Mean 18 Jun 104
V. Geomagnetic A Indices
Observed Afr/Ap 17 Jun 008/011 Estimated Afr/Ap 18 Jun 005/007 Predicted Afr/Ap 19 Jun-21 Jun 005/005-007/008-007/008
VI. Geomagnetic Activity Probabilities 19 Jun to 21 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 20% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 25% | 25% |
| Minor storm | 01% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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