Viewing archive of Sunday, 12 August 2001

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 2001 Aug 12 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 224 Issued at 2200Z on 12 Aug 2001

IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z

Solar activity was low. Occasional C-class flares were observed through the period. Two new regions were numbered today as Regions 9577 (N16W15) and 9578 (S10W11).
IB. Solar Activity Forecast
Solar activity is expected to be low. An isolated M-class event is possible.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic field was quiet to minor storm conditions. A shock passed the ACE spacecraft at 12/1050 UTC and created a sudden impulse of 23 nt on the Boulder magnetometer at 12/1136 UTC. Solar wind velocity increased from 336 km/s to 406 km/s and density jumped from 6 p/cc to 35 p/cc. This shock is believed related to the partial halo coronal mass ejection observed on 09 August.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be active to minor storm conditions for 13 August due to the CME mentioned in IIA. Quiet to unsettled conditions should prevail on 14 and 15 August.
III. Event Probabilities 13 Aug to 15 Aug
Class M30%30%30%
Class X05%05%05%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       12 Aug 160
  Predicted   13 Aug-15 Aug  155/150/145
  90 Day Mean        12 Aug 151
V. Geomagnetic A Indices
  Observed Afr/Ap 11 Aug  002/006
  Estimated     Afr/Ap 12 Aug  015/020
  Predicted    Afr/Ap 13 Aug-15 Aug  030/030-010/015-010/010
VI. Geomagnetic Activity Probabilities 13 Aug to 15 Aug
A. Middle Latitudes
Active25%15%15%
Minor storm15%05%05%
Major-severe storm10%01%01%
B. High Latitudes
Active30%20%20%
Minor storm20%10%05%
Major-severe storm15%05%01%

All times in UTC

<< Go to daily overview page

Latest news

Support SpaceWeatherLive.com!

A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!

SpaceWeatherLive Pro
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/12/08X2.2
Last M-flare2024/12/22M1.1
Last geomagnetic storm2024/12/17Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
November 2024152.5 -13.9
December 2024103.3 -49.2
Last 30 days114 -43.9

This day in history*

Solar flares
12015M6.75
21998M3.34
32013M2.36
42013M1.97
52001M1.69
DstG
12002-67
22000-62G2
31989-60
42014-57
51982-53G1
*since 1994

Social networks