Viewing archive of Tuesday, 21 June 2005

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 2005 Jun 21 2210 UTC
# Prepared jointly by the U.S. Dept. of Commerce, NOAA, #Space Environment Center and the U.S. Air Force. #

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 172 Issued at 2200Z on 21 Jun 2005

IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z

Solar activity was low. Region 780 (S07E12) produced an impulsive C2.1/Sf at 1804 UTC. No significant development was observed on active regions and no new regions were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be very low to low. Regions 779 (S16W71) and 780 may produce C-class flares.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic field was quiet. The greater than 2 MeV electron flux at geosynchronous orbit remained above high levels throughout the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet for the next two days. Active and isolated minor storm conditions are possible on day three (24 June) as a coronal hole high speed solar wind stream becomes geoeffective.
III. Event Probabilities 22 Jun to 24 Jun
Class M10%10%05%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       21 Jun 083
  Predicted   22 Jun-24 Jun  085/085/080
  90 Day Mean        21 Jun 093
V. Geomagnetic A Indices
  Observed Afr/Ap 20 Jun  002/005
  Estimated     Afr/Ap 21 Jun  003/004
  Predicted    Afr/Ap 22 Jun-24 Jun  003/005-005/005-010/010
VI. Geomagnetic Activity Probabilities 22 Jun to 24 Jun
A. Middle Latitudes
Active10%15%20%
Minor storm05%05%10%
Major-severe storm01%01%01%
B. High Latitudes
Active15%15%25%
Minor storm10%10%20%
Major-severe storm01%01%05%

All times in UTC

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G1 - Minor geomagnetic storm

Observed Kp: 5
Threshold reached: 23:35 UTC

Current data suggests there is a high possibility for aurora to appear at the following high latitude regions in the near future

Iqaluit, NU
Nuuk
Oulu, Rovaniemi, Sodankylä, Utsjoki
Reykjavik
Kirkenes, Tromsø
Murmansk
Kiruna, Luleå

Current data suggests there is a moderate possibility for aurora to appear at the following high latitude regions in the near future

Tórshavn
Trondheim
Arkhangelsk
Sundsvall, Umeå

Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future

Kuopio
Bergen

Current data suggests there is a slight possibility for aurora to appear at the following middle latitude regions in the near future

Tampere
Petrozavodsk
The solar wind speed is currently moderately high (512.9 km/sec.)
The strength of the interplanetary magnetic field is moderate (18.45nT), the direction is slightly South (-8.88nT).

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