Viewing archive of Tuesday, 4 April 2017
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 2017 Apr 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 94 Issued at 2200Z on 04 Apr 2017IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C3 event observed at
04/0712Z from Region 2644 (N13W92). There are currently 4 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low with a
chance for M-class flares and a slight chance for an X-class flare on
day one (05 Apr) and expected to be very low with a chance for a C-class
flares and a slight chance for an M-class flare on days two and three
(06 Apr, 07 Apr).
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 488 km/s at 04/1548Z. Total IMF
reached 16 nT at 04/1035Z. The maximum southward component of Bz reached
-13 nT at 04/0932Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 18021 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and three (05 Apr, 07 Apr)
and quiet to unsettled levels on day two (06 Apr). Protons have a slight
chance of crossing threshold on day one (05 Apr), have a slight chance
of crossing threshold on day two (06 Apr) and have a slight chance of
crossing threshold on day three (07 Apr).
III. Event Probabilities 05 Apr to 07 Apr
| Class M | 35% | 20% | 10% |
| Class X | 15% | 05% | 05% |
| Proton | 20% | 15% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Apr 094 Predicted 05 Apr-07 Apr 090/086/082 90 Day Mean 04 Apr 078
V. Geomagnetic A Indices
Observed Afr/Ap 03 Apr 004/005 Estimated Afr/Ap 04 Apr 015/020 Predicted Afr/Ap 05 Apr-07 Apr 009/012-007/008-010/012
VI. Geomagnetic Activity Probabilities 05 Apr to 07 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 20% | 20% | 15% |
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