Viewing archive of Friday, 8 May 1998
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 1998 May 08 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.comJoint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 128 Issued at 2200Z on 08 MAY 1998
IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z
SOLAR ACTIVITY WAS MODERATE. THREE M-CLASS EVENTS
OCCURRED OVER THE LAST 24 HOURS: AN M3 AT 0204Z (WITH TYPE II/IV
SWEEPS), AND M1 AT 0608Z (WITH TYPE II/IV), AND AN M1 AT 1415Z. NO
H-ALPHA FLARES WERE OBSERVED WITH THESE X-RAY EVENTS, BUT
SUPPLEMENTAL DATA (EIT AND LASCO) INDICATE THAT REGION 8210, WHICH
HAS ROTATED AROUND WEST LIMB, WAS THE MOST LIKELY SOURCE. REGION
8214 (N28W61) WAS ABLE TO MUSTER A C5/1N FLARE AT 1306Z. THE REGION
APPEARS TO BE DECAYING AND SIMPLIFYING, ALTHOUGH THE PROXIMITY TO
THE LIMB MAKES ANALYSIS MORE DIFFICULT. A NEW B-TYPE GROUP NEAR
N26E53 WAS ASSIGNED TODAY AS 8219. REGION 8218 (S20E48) APPEARS TO
BE GROWING, BUT WAS FAIRLY STABLE. X-RAY IMAGES INDICATE THAT THERE
IS A REGION BEHIND THE NORTHEAST LIMB WHICH SHOULD ROTATE INTO VIEW
SOMETIME IN THE NEXT FEW DAYS.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE. THERE IS A FAIR CHANCE FOR AN ISOLATED M-CLASS EVENT FROM
EITHER REGION 8214 OR 8218.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
THE GEOMAGNETIC FIELD WAS PREDOMINANTLY ACTIVE DURING THE PAST 24
HOURS. THERE WERE SOME PERIODS OF MINOR STORM LEVELS AT HIGH
LATITUDES, PARTICULARLY AROUND 07/2100-08/0200Z AND FROM
08/1500-08/1700Z.THE DISTURBANCE BEGAN GRADUALLY: THERE WAS NO CLEAR
INDICATOR OF THE ARRIVAL OF A SHOCK AT L1 OR EARTH. THE GREATER THAN
2 MEV ELECTRON FLUXES WERE AT MODERATE TO HIGH LEVELS DURING THE
DAY.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE FOR THE NEXT 24 HOURS.
PERSISTENCE FROM THE CURRENT DISTURBANCE MAY CAUSE SOME LOCAL
NIGHTTIME SUBSTORM EFFECTS. PREDOMINANTLY UNSETTLED LEVELS ARE
EXPECTED FOR THE SECOND AND THIRD DAYS.
III. Event Probabilities 09 MAY to 11 MAY
Class M | 55% | 55% | 55% |
Class X | 05% | 05% | 05% |
Proton | 05% | 05% | 05% |
PCAF | GREEN
|
IV. Penticton 10.7 cm Flux
Observed 08 MAY 118
Predicted 09 MAY-11 MAY 115/110/105
90 Day Mean 08 MAY 107
V. Geomagnetic A Indices
OBSERVED AFR/AP 07 MAY 010/013
ESTIMATED AFR/AP 08 MAY 025/020
PREDICTED AFR/AP 09 MAY-11 MAY 015/015-010/015-010/015
VI. Geomagnetic Activity Probabilities 09 MAY to 11 MAY
A. Middle Latitudes |
Active | 50% | 10% | 10% |
Minor storm | 15% | 05% | 05% |
Major-severe storm | 05% | 05% | 05% |
B. High Latitudes |
Active | 50% | 10% | 10% |
Minor storm | 20% | 05% | 05% |
Major-severe storm | 15% | 05% | 05% |
All times in UTC
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