Affichage des archives de lundi, 4 mai 1998
Rapport d'activité solaire
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.
Rapport d'activité solaire et géophysique 1998 May 04 2200 UTCFait par le NOAA © SWPC et adapté par SpaceWeatherLive.com
Rapport de l'USAF/NOAA sur l'activité solaire et géophysique
:::::::::: CORRECTED COPY :::::::::: SDF numéro 124 publié à 2200Z le 04 MAY 1998IA. Analyse des régions solaires actives et activité du 03-2100Z au 04-2100Z SOLAR ACTIVITY HAS BEEN MODERATE FOR THE PAST 24 HOURS.
AT 03/2129Z AN M1/1B TENFLARE (810 FLUX UNITS, 8 MINUTES DURATION)
ACCOMPANIED
BY A MAJOR TYPE IV SWEEP, WAS ASSOCIATED WITH A 1B FLARE IN REGION
8210 (S17W50) AND A SIMULTANEOUS SUBFAINT FLARE IN REGION 8214
(N27E18). SYMPATHETIC FLARING HAS BEEN A CHARACTERISTIC OF THESE TWO
WIDELY SEPARATED REGIONS FOR THE PAST SEVERAL DAYS. REGION 8210 HAS
FRAGMENTED AND SHOWN CONSIDERABLE DECAY, BUT REGION 8214 IS STILL
GROWING IN WHITE LIGHT ALTHOUGH IT HAS NOT DEVELOPED THE MAGNETIC
COMPLEXITY USUALLY ASSOCIATED WITH ENERGETIC EVENTS. AN ACTIVE
PROMINENCE ON THE SOUTHEAST LIMB WAS OBSERVED, BUT THE REMAINDER OF
THE DISK AND LIMBS WERE QUIET.
IB. Prévisions d'activité solaire
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE BASED ON THE COMBINED FLARE POTENTIAL IN REGIONS 8210 AND
8214. THE PROBABILITY OF X-CLASS ACTIVITY HAS LESSENED WITH THE
RECENT SIMPLIFICATION OF REGION 8210, BUT ADDITIONAL GROWTH IN
REGION 8214 COULD BE A PRECURSOR TO NEW MAJOR EVENTS.
IIA. Résumé de l'activité géophysique du 03-2100Z au 04-2100Z
GEOMAGNETIC ACTIVITY HAS RANGED FROM UNSETTLED TO SEVERE STORM LEVELS
FOR THE PAST 24 HOURS. THIS DISTURBANCE IS ASSUMED TO BE RELATED TO
COMPLEX SOLAR WIND STRUCTURES ASSOCIATED WITH A SERIES OF ENERGETIC
SOLAR EVENTS BEGINNING ON 29 APRIL, AND ESPECIALLY AN X1 X-RAY EVENT
THAT REACHED MAXIMUM 02/1342 UT. A SHOCK PASSED THE ACE SPACECRAFT
AT APPROXIMATELY 04/0229 UT THAT WAS OBSERVED AT EARTH APPROXIMATELY
30 MINUTES LATER. THEREAFTER, A TWO-HOUR PERIOD OF VERY STRONG
(ABOUT 40 NT) SOUTHWARD SOLAR WIND MAGNETIC FIELD WAS OBSERVED,
RESULTING IN K INDICES OF 8 IN BOULDER BETWEEN 03-09 UT AND REPORTS
OF AURORAL SIGHTINGS IN THE NORTHERN UNITED STATES. THE ENERGETIC
PROTON EVENT THAT BEGAN ON 02/1405 ENDED 04/0310 UT.
IIB. Prévision de l'activité géophysique
GEOMAGNETIC ACTIVITY IS
EXPECTED TO EXPERIENCE PERIODS AT STORM LEVELS FOR THE NEXT 24
HOURS. WHILE IT IS CLEAR THAT THE LEADING PORTION OF THE CORONAL
MASS EJECTION ASSOCIATED WITH THE X1 FLARE HAS ARRIVED, IT IS NOT
CERTAIN WHETHER THE CORE OF THE EJECTION WILL YET ARRIVE. THEREFORE,
STORM LEVEL WARNINGS ARE ADVISED THROUGH 5 MAY. THE DISTURBANCE IS
EXPECTED TO END BY 7 MAY UNLESS NEW SOLAR EVENTS OCCUR.
III. Probabilité d'éruption solaire du 05 MAY au 07 MAY
| Classe M | 50% | 50% | 50% |
| Classe X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | YELLOW | ||
IV. Flux Penticton 10.7 cm
Observé 04 MAY 121 Prévisionnel 05 MAY-07 MAY 135/140/145 Moyenne des 90 derniers jours 04 MAY 105
V. Indice géomagnetique A
OBSERVED AFR/AP 03 MAY 037/057 ESTIMATED AFR/AP 04 MAY 086/100 PREDICTED AFR/AP 05 MAY-07 MAY 050/060-025/045-010/025
VI. Probabilités d'activité géomagnétique du 05 MAY au 07 MAY
| A. Latitudes moyennes | |||
|---|---|---|---|
| Actif | 10% | 30% | 20% |
| Tempête mineure | 20% | 25% | 05% |
| Tempête majeure/sévère | 60% | 20% | 01% |
| B. Hautes latitudes | |||
|---|---|---|---|
| Actif | 10% | 30% | 50% |
| Tempête mineure | 25% | 30% | 20% |
| Tempête majeure/sévère | 65% | 20% | 05% |
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