Viewing archive of Sunday, 16 May 1999

Solar activity report

Report of Solar-Geophysical Activity 1999 May 16 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 136 Issued at 2200Z on 16 MAY 1999

IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z

SOLAR ACTIVITY HAS BEEN MODERATE. THE MOST SIGNIFICANT ACTIVITY WAS A PAIR OF M1 X-RAY EVENTS AT 16/1346Z AND 16/1720Z. BOTH WERE IMPULSIVE EVENTS ASSOCIATED WITH OPTICAL ACTIVITY IN REGION 8534 (S17W76). THERE HAVE BEEN ONLY MINOR CHANGES IN THE SIZE AND COMPLEXITY OF THE CURRENT ACTIVE REGIONS.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. IIA. GEOPHYSICAL ACTIVITY SUMMARY FROM 15/2100Z TO 16/2100Z: THE GEOMAGNETIC FIELD HAS BEEN QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 17 MAY to 19 MAY
Class M20%20%20%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       16 MAY 152
  Predicted   17 MAY-19 MAY  145/145/140
  90 Day Mean        16 MAY 130
V. Geomagnetic A Indices
OBSERVED AFR/AP 15 MAY  006/009
ESTIMATED AFR/AP 16 MAY  005/007
PREDICTED AFR/AP 17 MAY-19 MAY  012/018-008/012-008/010
VI. Geomagnetic Activity Probabilities 17 MAY to 19 MAY
A. Middle Latitudes
Active10%05%05%
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active10%10%10%
Minor storm05%05%05%
Major-severe storm01%01%01%

<< 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%

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/10/26Kp5 (G1)
Number of spotless days in 2019:242
Current stretch spotless days:15

This day in history*

Solar flares
11999M7.4
22003M4.2
32001M2.8
42002M2.0
52003M1.2
ApG
1200339G1
2200113
3199613
4199912
5201410
*since 1994

Social networks