Viewing archive of Tuesday, 28 February 2012

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 2012 Feb 28 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 059 Issued at 2200Z on 28 Feb 2012

IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z

Solar activity was very low during the past 24 hours.
IB. Solar Activity Forecast
Solar activity is expected to be very low for the next three days (29 Feb - 02 Mar) with just a slight chance for an isolated C-class flare.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic field ranged from quiet to active levels with a period of minor storm levels at some observatories during the local nighttime hours. Quiet conditions prevailed from the beginning of the period until about 07Z when a substorm interval began and continued through about 09Z. The planetary activity reached active levels but several individual stations attained minor storm levels during the disturbance. Activity promptly returned to predominantly quiet levels after the substorm and remained quiet for the rest of the period. The disturbance was preceded by about two hours of southward interplanetary magnetic field (IMF) seen at the ACE spacecraft (0510-0702Z, with maximum southward deflection of -11 nT). The IMF was otherwise predominantly northwards during the interval. ACE data also indicated a solar sector boundary crossing at about 1534Z. The greater than 10 MeV protons observed by GOES returned to background levels late on the 27th and remained there through the end of the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet for the first two days (29 Feb - 01 Mar). A slight increase to quiet to unsettled levels is expected on the third day (02 Mar) due to a small but well positioned coronal hole.
III. Event Probabilities 29 Feb to 02 Mar
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       28 Feb 103
  Predicted   29 Feb-02 Mar  105/105/105
  90 Day Mean        28 Feb 128
V. Geomagnetic A Indices
  Observed Afr/Ap 27 Feb  012/019
  Estimated     Afr/Ap 28 Feb  008/009
  Predicted    Afr/Ap 29 Feb-02 Mar  006/005-006/005-007/008
VI. Geomagnetic Activity Probabilities 29 Feb to 02 Mar
A. Middle Latitudes
Active05%05%10%
Minor storm01%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Active15%15%15%
Minor storm10%10%25%
Major-severe storm05%05%15%

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