Viewing archive of Wednesday, 23 February 2000

Solar activity report

Report of Solar-Geophysical Activity 2000 Feb 23 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 054 Issued at 2200Z on 23 FEB 2000

IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z

SOLAR ACTIVITY WAS MODERATE DUE TO A SINGLE UNCORRELATED M1 X-RAY FLARE AT 22/2147Z. THE FLARE WAS PROBABLY THE SUPERPOSITION OF THREE EVENTS, A LONG DURATION C9 AND IMPULSIVE M1 AND C7 FLARES, BUT WITHOUT OPTICAL CORRELATION IT IS IMPOSSIBLE TO BE SURE. THE REMAINDER OF THE PERIOD SAW NUMEROUS UNCORRELATED C-CLASS FLARES AMIDST A BACKGROUND X-RAY FLUX AVERAGING NEARLY C2. THREE NEW REGIONS WERE NUMBERED TODAY, 8884 (S11W74), 8885 (N11W43), AND 8886 (S14E31).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE PREDOMINANTLY LOW, WITH ISOLATED M-CLASS FLARES POSSIBLE. SOLAR ACTIVITY IS EXPECTED TO BE ON THE RISE BY THE END OF THE PERIOD. IMAGERY FROM THE YOHKOH SOFT X-RAY TELESCOPE SUGGESTS AT LEAST TWO LARGE ACTIVE REGIONS WILL SOON BE ROTATING ONTO THE DISK. IIA. GEOPHYSICAL ACTIVITY SUMMARY FROM 22/2100Z TO 23/2100Z: THE GEOMAGNETIC FIELD WAS PREDOMINANTLY QUIET TO UNSETTLED. THE FIELD INCREASED TO ACTIVE BETWEEN 15Z AND 18Z DUE TO THE ARRIVAL OF A CO-ROTATING INTERACTION REGION (CIR) SEEN IN ACE DATA. THIS CIR BROUGHT INCREASED SOLAR WIND VELOCITIES AND MAGNETIC FIELD STRENGTH; BZ FLUCTUATED WILDLY BETWEEN -15 AND 10 NT. THE CIR HERALDS THE EXPECTED RETURN OF A HIGH SPEED CORONAL HOLE STREAM.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE UNSETTLED TO ACTIVE IN THE MIDDLE LATITUDES AND UNSETTLED TO MINOR STORM IN THE HIGHER LATITUDES FOR THE FIRST TWO DAYS OF THE FORECAST PERIOD DUE TO THE EFFECTS OF A RECURRENT CORONAL HOLE STREAM. ON THE THIRD DAY ACTIVITY IS EXPECTED TO DIMINISH.
III. Event Probabilities 24 FEB to 26 FEB
Class M 30%30%30%
Class X 05%05%05%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       23 FEB 185
  Predicted    24 FEB-26 FEB  185/185/190
  90 Day Mean        23 FEB 164
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 FEB  005/005
ESTIMATED AFR/AP 23 FEB  010/012
PREDICTED AFR/AP 24 FEB-26 FEB  020/023-020/018-015/015
VI. Geomagnetic Activity Probabilities 24 FEB to 26 FEB
A. Middle Latitudes
Active50%50%35%
Minor storm 15%15%05%
Major-severe storm 01%01%01%
B. High Latitudes
Active60%60%45%
Minor storm 20%20%10%
Major-severe storm 05%05%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%

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/07/10Kp5 (G1)
Number of spotless days in 2019:133
Last spotless day:2019/07/21

This day in history*

Solar flares
12002X4.8
22016M7.6
32016M5.5
42016M5.0
52004M2.2
ApG
1200452G2
2199840G1
3200023G2
4201521G1
5200217G1
*since 1994

Social networks