Viewing archive of Sunday, 15 March 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 Mar 15 2305 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 74 Issued at 2200Z on 15 Mar 2015

IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z

Solar activity has been at moderate levels for the past 24 hours. The largest solar event of the period was a M1 event observed at 15/0940Z from Region 2297 (S18W36). 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 (16 Mar, 17 Mar, 18 Mar).
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
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 352 km/s at 15/0448Z. Total IMF reached 14 nT at 15/1727Z. The maximum southward component of Bz reached -5 nT at 15/1426Z. Protons greater than 10 MeV at geosynchronous orbit reached a peak level of 4 pfu at 15/0930Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on day one (16 Mar), quiet to active levels on day two (17 Mar) and unsettled to minor storm levels on day three (18 Mar). Protons have a chance of crossing threshold on day one (16 Mar), have a chance of crossing threshold on day two (17 Mar) and have a chance of crossing threshold on day three (18 Mar).
III. Event Probabilities 16 Mar to 18 Mar
Class M70%70%70%
Class X20%20%20%
IV. Penticton 10.7 cm Flux
  Observed       15 Mar 114
  Predicted   16 Mar-18 Mar 115/112/110
  90 Day Mean        15 Mar 139

V. Geomagnetic A Indices
  Observed Afr/Ap 14 Mar  005/005
  Estimated     Afr/Ap 15 Mar  010/012
  Predicted    Afr/Ap 16 Mar-18 Mar  008/008-012/015-015/020

VI. Geomagnetic Activity Probabilities 16 Mar to 18 Mar
A. Middle Latitudes
Minor storm05%10%20%
Major-severe storm01%01%05%
B. High Latitudes
Minor storm25%30%25%
Major-severe storm20%40%60%

All times in UTC

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