Viewing archive of Sunday, 1 October 2000

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 2000 Oct 01 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 275 Issued at 2200Z on 01 OCT 2000

IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 01-2100Z

SOLAR ACTIVITY WAS HIGH. TWO OPTICALLY UNCORRELATED X-RAY FLARES, AN X1 AT 30/2321Z AND M5 AT 01/0701Z, ARE BELIEVED TO HAVE BEEN PRODUCED BY REGION 9169 THAT JUST RECENTLY PASSED BEHIND THE WEST LIMB. A 200 SFU TENFLARE ACCOMPANIED THE M5 EVENT. A LONG-DURATION M2 FLARE AT 01/1410Z IS BELIEVED TO HAVE ORIGINATED FROM REGION 9178 (S22E24); THIS REGION ALSO PRODUCED NUMEROUS C-CLASS FLARES. REGION 9176 (S10E15) PRODUCED A C3/SF FLARE WITH AN ASSOCIATED TYPE II RADIO SWEEP (SHOCK SPEED 1100 KM/S). A 12-DEGREE FILAMENT DISAPPEARED OVERNIGHT FROM N22W37. NEW REGION 9180 (S34W21) WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. WHILE REGION 9169, WHICH IS BELIEVED TO HAVE CAUSED THE RECENT MAJOR FLARES, IS NOW WELL BEHIND THE LIMB, BOTH REGIONS 9176 (S09E18) AND 9178 REMAIN CAPABLE OF PRODUCING M-FLARES. IIA. GEOPHYSICAL ACTIVITY SUMMARY 30/2100Z TO 01/2100Z: THE GEOMAGNETIC FIELD RANGED FROM ACTIVE TO QUIET CONDITIONS. ACTIVE CONDITIONS WERE OBSERVED UNTIL APPROXIMATELY 01/06Z, AT WHICH POINT THE SOLAR WIND SPEED AND INTERPLANETARY MAGNETIC FIELD BEGAN TO DROP TO NOMINAL LEVELS. RELATIVISTIC ELECTRONS AT GEO-SYNCHRONOUS ORBIT REACHED MODERATE LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO UNSETTLED FOR THE FIRST DAY, WITH ACTIVITY INCREASING FOR THE SECOND AND THIRD DAYS. A RECURRENT CORONAL HOLE WILL BE GEO-EFFECTIVELY POSITIONED BY DAY TWO. IN ADDITION, EFFECTS FROM ANY OF THE MANY SOLAR EVENTS TODAY COULD IMPACT THE EARTH LATE ON DAY TWO INTO DAY THREE.
III. Event Probabilities 02 OCT to 04 OCT
Class M50%50%50%
Class X05%05%05%
Proton05%05%05%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       01 OCT 202
  Predicted   02 OCT-04 OCT  190/190/185
  90 Day Mean        01 OCT 183
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 SEP  025/045
ESTIMATED AFR/AP 01 OCT  015/015
PREDICTED AFR/AP 02 OCT-04 OCT  010/010-012/012-015/015
VI. Geomagnetic Activity Probabilities 02 OCT to 04 OCT
A. Middle Latitudes
Active15%25%25%
Minor storm05%10%15%
Major-severe storm01%01%05%
B. High Latitudes
Active20%25%25%
Minor storm05%15%20%
Major-severe storm01%05%10%
VII. COMMENTS EFFECTIVE 2 OCT 2000, SEC WILL ISSUE ITS TEXT PRODUCTS IN MIXED CASE VS. ALL UPPER CASE. THIS CHANGE WILL BE VISIBLE ON ALL SEC PRODUCT DELIVERY SYSTEMS EXCEPT FOR TELETYPE CIRCUITS. ONLY THE CASE OF THE TEXT IN EACH PRODUCT WILL CHANGE, NOT THE FORMAT OR SPACING WITHIN THE PRODUCT. FOR DETAILS SEE OUR WEBSITE AT SEC.NOAA.GOV/MIXEDCASE.HTML

All times in UTC

<< 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!

74%
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/05/27X2.9
Last M-flare2024/05/24M1.4
Last geomagnetic storm2024/05/17Kp6 (G2)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
April 2024136.5 +31.6
May 2024147.5 +11
Last 30 days143.3 +6.2

This day in history*

Solar flares
12003X5.17
22011M1.67
31998M1.51
42000M1.24
52011M1.19
ApG
1195063G3
2201749G3
3197045G3
4199444G3
5196755G3
*since 1994

Social networks