Viewing archive of Monday, 30 April 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 Apr 30 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 121 Issued at 2200Z on 30 Apr 2012

IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z

Solar activity has been at low levels for the past 24 hours. Before rotating off the west limb of the solar disk, Region 1465 (S18W95) produced a long duration C3 x-ray flare at 30/0738Z. Associated with this event were both a Type II radio sweep (estimated shock velocity of 645 km/s) and a non-Earth directed CME. Region 1471 (S22E45) also produced multiple C-class events and appears to be growing in sunspot area and magnetic complexity as it rotates further into view. No new sunspot regions were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at low levels for the next three days (01 - 03 May).
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speeds, as measured by the ACE spacecraft, remained at nominal levels throughout the summary period.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels for days one and two (01 - 02 May) as a coronal hole high speed stream moves into a geoeffective position. A return to quiet levels is expected on day three (03 May) as the effects of the high speed stream wane.
III. Event Probabilities 01 May to 03 May
Class M10%10%10%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       30 Apr 114
  Predicted   01 May-03 May  115/115/115
  90 Day Mean        30 Apr 112
V. Geomagnetic A Indices
  Observed Afr/Ap 29 Apr  005/005
  Estimated     Afr/Ap 30 Apr  002/003
  Predicted    Afr/Ap 01 May-03 May  007/008-007/008-004/005
VI. Geomagnetic Activity Probabilities 01 May to 03 May
A. Middle Latitudes
Active15%15%10%
Minor storm05%05%01%
Major-severe storm01%01%01%
B. High Latitudes
Active25%25%15%
Minor storm10%10%05%
Major-severe storm01%01%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!

100%
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/11/06X2.39
Last M-flare2024/11/11M1.3
Last geomagnetic storm2024/11/10Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
October 2024166.4 +25
November 2024175.7 +9.3
Last 30 days166.1 +21.7

This day in history*

Solar flares
12012M8.59
22012M4.14
32005M3.59
42012M3.56
52003M2.36
DstG
11960-339G5
21998-131G2
31989-121G1
41999-106G2
51979-92G1
*since 1994

Social networks