Viewing archive of Sunday, 13 July 2003

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 2003 Jul 13 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 194 Issued at 2200Z on 13 Jul 2003

IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z

Solar activity was low. Today's activity consisted of a few, low-level C-class subflares. Newly assigned Region 409 (N16E66) rotated more fully into view today and was one of the most active regions. This group is currently the largest on the disk and was the source of recent flare activity observed on and near the northeast limb during the last couple of days. Region 401 (S10W31) showed some development of new spots in the central part of the group but was stable and quiet. Two additional regions were assigned today: Region 408 (N13E23), a small newly emerged group, and Region 410 (S13E63), also a small group that has just rotated into view. A thirteen degree filament located near N26W08 disappeared between 0100-0900 UTC. Post-eruption arcades were visible in SXI and EIT-195 images.
IB. Solar Activity Forecast
Solar activity is expected to be mostly low, but there is a chance for an isolated M-class event over the next three days, with Regions 409 and 401 the most likely sources.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic field was unsettled to active during the past 24 hours. Solar wind speeds remain somewhat elevated today (around 500-600 km/s), but are lower than yesterday and show an overall declining trend. The greater than 2 MeV electron fluxes were at high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be mostly active over the next three days. Some persistence of today's activity is expected to linger into tomorrow. It is possible that transient flow may arrive sometime during the next three days from the M3 flare of 10 July or from any of the recent filament eruptions. However, ACE EPAM data do not indicate the presence of a strong interplanetary shock at this time, making transient drivers seem less probable than previously. The onset of effects from another high speed wind stream are expected on day two or day three as a new coronal hole will be rotating into favorable position.
III. Event Probabilities 14 Jul to 16 Jul
Class M40%40%40%
Class X05%05%05%
Proton05%05%05%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       13 Jul 127
  Predicted   14 Jul-16 Jul  130/130/130
  90 Day Mean        13 Jul 125
V. Geomagnetic A Indices
  Observed Afr/Ap 12 Jul  025/046
  Estimated     Afr/Ap 13 Jul  015/015
  Predicted    Afr/Ap 14 Jul-16 Jul  020/020-020/030-020/025
VI. Geomagnetic Activity Probabilities 14 Jul to 16 Jul
A. Middle Latitudes
Active35%35%35%
Minor storm20%20%20%
Major-severe storm10%10%10%
B. High Latitudes
Active35%35%35%
Minor storm25%25%25%
Major-severe storm15%15%15%

All times in UTC

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