Viewing archive of Thursday, 22 April 1999

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 1999 Apr 22 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 112 Issued at 2200Z on 22 APR 1999

IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z

SOLAR ACTIVITY WAS AT LOW LEVELS. A C4 X-RAY BURST OCCURRED AT 22/0509Z AND WAS LIKELY ASSOCIATED WITH A CORONAL MASS EJECTION OFF THE SW LIMB. REGION 8518 (S15E04) EXHIBITED MINOR GROWTH WITH SEVERAL PLAGE FLUCTUATIONS NOTED LATE IN THE PERIOD. REMAINING REGIONS WERE QUIET.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY LOW TO LOW. REGION 8518 HAS POTENTIAL FOR C-CLASS ACTIVITY.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO REMAIN QUIET.
III. Event Probabilities 23 APR to 25 APR
Class M10%10%10%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       22 APR 100
  Predicted   23 APR-25 APR  105/105/105
  90 Day Mean        22 APR 130
V. Geomagnetic A Indices
OBSERVED AFR/AP 21 APR  009/012
ESTIMATED AFR/AP 22 APR  007/007
PREDICTED AFR/AP 23 APR-25 APR  007/007-007/007-010/010
VI. Geomagnetic Activity Probabilities 23 APR to 25 APR
A. Middle Latitudes
Active10%10%15%
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active15%15%20%
Minor storm05%05%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!

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-flare2024/12/24M1.0
Last geomagnetic storm2024/12/17Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
November 2024152.5 -13.9
December 2024115.2 -37.3
Last 30 days120.1 -38.2

This day in history*

Solar flares
12011M5.77
21998M1.83
32001M1.76
42001M1.41
52011M1.22
DstG
11988-85
21998-57
31978-57G2
42014-49
52002-39
*since 1994

Social networks