Viewing archive of Tuesday, 19 July 2011

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 2011 Jul 19 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 200 Issued at 2200Z on 19 Jul 2011

IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z

Solar activity was very low. There were seven numbered active regions on the disk today, but all remain quiet and stable. The two most significant, Region 1257 (N20W83) and Region 1254 (S22W04) were classified as Dso Beta groups, producing only a few weak B-class events.
IB. Solar Activity Forecast
Solar activity is expected to be very low to low with a chance for a C-class flare over the next 3 days (20-22 July).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic field was mostly quiet to unsettled with the exception of an isolated period of active conditions at mid latitudes and a minor storm at high latitudes between 19/15Z-19/18Z. This activity was associated with the onset of coronal hole high speed stream effects.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to remain at mostly unsettled to active levels with and isolated minor storm possible on days 1 and 2 (20-21 July) as the result of coronal hole high speed stream effects. Conditions should decrease to primarily unsettled levels with the chance for isolated active periods on day 3 (22 July), as coronal hole effects begin to decline.
III. Event Probabilities 20 Jul to 22 Jul
Class M05%05%05%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       19 Jul 100
  Predicted   20 Jul-22 Jul  100/100/100
  90 Day Mean        19 Jul 097
V. Geomagnetic A Indices
  Observed Afr/Ap 18 Jul  006/008
  Estimated     Afr/Ap 19 Jul  007/010
  Predicted    Afr/Ap 20 Jul-22 Jul  012/012-010/012-010/010
VI. Geomagnetic Activity Probabilities 20 Jul to 22 Jul
A. Middle Latitudes
Active20%30%30%
Minor storm10%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active30%30%30%
Minor storm20%10%10%
Major-severe storm01%01%01%

<< 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!

23%
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/03/28X1.1
Last M-flare2024/03/29M3.2
Last geomagnetic storm2024/03/25Kp5 (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
February 2024124.7 +1.7

This day in history*

Solar flares
12001X2.45
22014X1.45
32023X1.2
42024M3.2
52001M3.13
ApG
1199928G2
2200337G1
3201328G1
4200122G1
5199820G1
*since 1994

Social networks