Viewing archive of Wednesday, 26 May 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 May 26 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 146 Issued at 2200Z on 26 MAY 1999

IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z

SOLAR ACTIVITY WAS MODERATE. THERE WERE A LARGE NUMBER OF WEAK C-CLASS X-RAY FLARES, TWO OF WHICH WERE LONG DURATION EVENTS. THE FIRST LDE WAS AN OPTICALLY UNCORRELATED C1 AT 25/2137Z, THE SECOND A C2/SF FROM REGION 8550 (S14W12) AT 26/0522Z. IN ADDITION THERE WAS A TYPE II RADIO SWEEP (SPEED 650 KM/S) CORRELATED TO A C2/SF FROM REGION 8554 (N26E26) AT 26/0230Z. FINALLY, THE STRONGEST FLARE WAS AN M1/2N FLARE FROM REGION 8552 (N11E41) AT 26/1932Z. ONE REGION, 8555 (N16E75), WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW WITH A CHANCE OF AN ISOLATED M-CLASS FLARE.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO UNSETTLED WITH A CHANCE FOR ACTIVE CONDITIONS LATE TOMORROW. THE INFLUENCE OF A RECURRENT CORONAL HOLE IS EXPECTED DURING THIS TIME.
III. Event Probabilities 27 MAY to 29 MAY
Class M30%30%30%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       26 MAY 153
  Predicted   27 MAY-29 MAY  150/155/160
  90 Day Mean        26 MAY 129
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 MAY  014/019
ESTIMATED AFR/AP 26 MAY  008/010
PREDICTED AFR/AP 27 MAY-29 MAY  010/010-010/012-010/012
VI. Geomagnetic Activity Probabilities 27 MAY to 29 MAY
A. Middle Latitudes
Active25%20%20%
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active25%25%25%
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-flare2024/12/24M4.1
Last geomagnetic storm2024/12/17Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
November 2024152.5 -13.9
December 2024110.7 -41.8
Last 30 days117.3 -41.4

This day in history*

Solar flares
12001M5
22024M4.7
32024M4.1
42023M2.9
52023M2.6
DstG
11995-65G1
22014-57
32001-55G1
42002-49G1
51990-47
*since 1994

Social networks