Viewing archive of Thursday, 28 April 2016
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 2016 Apr 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 119 Issued at 2200Z on 28 Apr 2016IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z
Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
28/1251Z from Region 2535 (N07E16). There are currently 6 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a chance for a C-class flares on days one, two, and three (29 Apr,
30 Apr, 01 May).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 498 km/s at 28/0303Z. Total IMF reached 5 nT at
28/0814Z. The maximum southward component of Bz reached -3 nT at
28/1247Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 347 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (29 Apr), unsettled to minor
storm levels on day two (30 Apr) and unsettled to active levels on day
three (01 May).
III. Event Probabilities 29 Apr to 01 May
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Apr 095 Predicted 29 Apr-01 May 095/095/092 90 Day Mean 28 Apr 096
V. Geomagnetic A Indices
Observed Afr/Ap 27 Apr 011/010 Estimated Afr/Ap 28 Apr 006/007 Predicted Afr/Ap 29 Apr-01 May 012/014-018/026-017/020
VI. Geomagnetic Activity Probabilities 29 Apr to 01 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 35% | 40% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 25% | 30% | 25% |
| Major-severe storm | 60% | 55% | 60% |
All times in UTC
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