Viewing archive of Monday, 9 August 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 Aug 09 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 221 Issued at 2200Z on 09 AUG 1999

IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z

SOLAR ACTIVITY WAS LOW. THE LARGEST EVENT OF THE PERIOD WAS A C4/1F LONG DURATION EVENT FROM REGION 8657 (S30W22) AT 09/0258Z. A FAINT HALO CORONAL MASS EJECTION WAS OBSERVED WITH THIS EVENT. REGION 8662 (S16E21), THE LARGEST REGION ON THE VISIBLE DISK, DOUBLED IN SIZE, NOW AN E-TYPE REGION MEASURING OVER 230 MILLIONTHS OF WHITE LIGHT AREA. FREQUENT FLUCTUATIONS AND MINOR SUBFLARES WERE OBSERVED IN THIS REGION. THE PERIOD ENDED WITH AN OPTICALLY UNCORRELATED LONG DURATION C2 X-RAY ENHANCEMENT. REMAINING REGIONS WERE QUIET.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO CONTINUE AT LOW LEVELS. REGIONS 8657 AND 8662 WILL LIKELY CONTINUE TO PRODUCE OCCASIONAL C-CLASS FLARES.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. AN EXTENDED PERIOD OF PREDOMINANTLY SOUTHWARD BZ DOMINATED MOST OF THE PERIOD, CAUSING ACTIVE CONDITIONS DURING LOCAL NIGHTTIME HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 10 AUG to 12 AUG
Class M15%15%15%
Class X05%05%05%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       09 AUG 138
  Predicted   10 AUG-12 AUG  135/135/135
  90 Day Mean        09 AUG 164
V. Geomagnetic A Indices
OBSERVED AFR/AP 08 AUG  007/007
ESTIMATED AFR/AP 09 AUG  013/028
PREDICTED AFR/AP 10 AUG-12 AUG  008/015-008/008-005/007
VI. Geomagnetic Activity Probabilities 10 AUG to 12 AUG
A. Middle Latitudes
Active15%15%10%
Minor storm05%05%01%
Major-severe storm01%01%01%
B. High Latitudes
Active20%20%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!

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