Viewing archive of Thursday, 18 June 2015
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 2015 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 2015IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M3 event observed at
18/1736Z from Region 2371 (N12E39). There are currently 3 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(19 Jun, 20 Jun, 21 Jun).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
605 km/s at 18/0301Z. Total IMF reached 6 nT at 18/0912Z. The maximum
southward component of Bz reached -4 nT at 18/1136Z. Protons greater
than 10 MeV at geosynchronous orbit reached a peak level of 16 pfu at
18/1445Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 1198 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on days one, two, and three (19 Jun, 20 Jun, 21
Jun). Protons are expected to cross threshold on days one and two (19
Jun, 20 Jun) and are likely to cross threshold on day three (21 Jun).
III. Event Probabilities 19 Jun to 21 Jun
| Class M | 70% | 70% | 60% |
| Class X | 15% | 15% | 10% |
| Proton | 80% | 80% | 60% |
| PCAF | yellow | ||
IV. Penticton 10.7 cm Flux
Observed 18 Jun 151 Predicted 19 Jun-21 Jun 145/147/148 90 Day Mean 18 Jun 127
V. Geomagnetic A Indices
Observed Afr/Ap 17 Jun 014/014 Estimated Afr/Ap 18 Jun 005/005 Predicted Afr/Ap 19 Jun-21 Jun 006/006-006/005-006/005
VI. Geomagnetic Activity Probabilities 19 Jun to 21 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 15% | 15% |
| Major-severe storm | 10% | 10% | 10% |
All times in UTC
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