Viewing archive of Sunday, 9 May 1999

Solar activity report

Report of Solar-Geophysical Activity 1999 May 09 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 129 Issued at 2200Z on 09 MAY 1999

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

SOLAR ACTIVITY WAS HIGH WITH AN M7 XRAY FLARE WHICH OCCURRED AT 09/1807UT. THE PROBABLE REGION AND LOCATION ARE 8537 AND N19W88. ADDITIONALLY, AN M1/1F OCCURRED AT 09/0047UT FROM REGION 8541 (N22E53) AND ANOTHER M1/SF AT 09/1227UT FROM REGION 8525 (N17W60).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE MODERATE. ALTHOUGH REGION 8537 IS ROTATING OFF THE DISK, OTHER ACTIVE REGIONS ARE EXPECTED KEEP ACTIVITY AT MODERATE LEVELS. IIA. GEOPHYSICAL ACTIVITY SUMMARY FROM 08/2100Z TO 09/2100Z: THE GEOMAGNETIC FIELD HAS BEEN QUIET. THE GREATER THAN 2 MEV ELECTRONS AT GEOSYNCHRONOUS ORBIT WERE AT MODERATE TO HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO UNSETTLED THROUGH THE SECOND DAY OF THE PERIOD. ON THE LAST DAY OF THE PERIOD, EFFECTS FROM A DISAPPEARING FILAMENT ARE EXPECTED TO INCREASE ACTIVITY SLIGHTLY.
III. Event Probabilities 10 MAY to 12 MAY
Class M75%75%60%
Class X20%20%15%
Proton05%05%05%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       09 MAY 178
  Predicted   10 MAY-12 MAY  180/180/180
  90 Day Mean        09 MAY 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 08 MAY  004/006
ESTIMATED AFR/AP 09 MAY  004/010
PREDICTED AFR/AP 10 MAY-12 MAY  008/005-008/008-010/010
VI. Geomagnetic Activity Probabilities 10 MAY to 12 MAY
A. Middle Latitudes
Active20%20%30%
Minor storm10%10%15%
Major-severe storm01%01%01%
B. High Latitudes
Active25%30%35%
Minor storm15%15%20%
Major-severe storm01%01%05%

<< Go to daily overview page

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!

64%

Space weather facts

Last X-flare2017/09/10X8.2
Last M-flare2020/05/29M1.1
Last geomagnetic storm2020/04/20Kp5 (G1)
Spotless days
Last 365 days308 days
2020152 days (77%)
Current stretch6 days

This day in history*

Solar flares
12004X3.6
22004X1.3
32004X1.1
42000M5.5
51999M3.1
ApG
1200050G4
2200348G2
3201744G2
4201242G2
5199837G2
*since 1994

Social networks