Viewing archive of Thursday, 30 September 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 Sep 30 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 273 Issued at 2200Z on 30 SEP 1999

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

SOLAR ACTIVITY WAS LOW. ONE MINOR C-CLASS EVENT OCCURRED AT 30/0507Z WITH NO OPTICAL CORRELATION. NEW REGION 8715 (N11E42) WAS NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO MINOR STORM CONDITIONS DUE TO A HIGH SPEED CORONAL HOLE STREAM IMPACTING THE EARTH. THE GREATER THAN 2 MEV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT DROPPED BELOW HIGH LEVELS BUT REMAINED ENHANCED DURING THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO ACTIVE. ISOLATED MINOR STORM CONDITIONS ARE POSSIBLE IN THE HIGHER LATITUDES DURING THE FIRST DAY OF THE PERIOD.
III. Event Probabilities 01 OCT to 03 OCT
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       30 SEP 125
  Predicted   01 OCT-03 OCT  122/125/125
  90 Day Mean        30 SEP 157
V. Geomagnetic A Indices
OBSERVED AFR/AP 29 SEP  022/019
ESTIMATED AFR/AP 30 SEP  024/025
PREDICTED AFR/AP 01 OCT-03 OCT  014/020-010/015-008/015
VI. Geomagnetic Activity Probabilities 01 OCT to 03 OCT
A. Middle Latitudes
Active20%15%15%
Minor storm15%10%10%
Major-severe storm01%01%01%
B. High Latitudes
Active35%20%20%
Minor storm20%15%15%
Major-severe storm05%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-flare2024/12/23M1.0
Last geomagnetic storm2024/12/17Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
November 2024152.5 -13.9
December 2024106.6 -45.9
Last 30 days116.1 -41.8

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