Viewing archive of Thursday, 1 May 1997
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 1997 May 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 121 Issued at 2200Z on 01 MAY 1997IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 01-2100Z SOLAR ACTIVITY REMAINED VERY LOW. A SMALL REGION IS
ROTATING ONTO THE DISK NEAR S28E90 BUT NO SPOTS WERE VISIBLE DURING
THE PERIOD.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD REMAIN AT A VERY
LOW LEVEL FOR THE NEXT THREE DAYS.
IIA. Geophysical Activity Summary 30-2100Z to 01-2100Z
THE GEOMAGNETIC FIELD WAS ACTIVE LATE ON 30 APR, THEN BECAME QUIET TO
UNSETTLED UNTIL 01/1500Z. ACTIVE CONDITIONS BEGAN ANEW AFTER THAT
TIME. RECENT SOLAR WIND DATA INDICATE AN INCREASE IN VELOCITY (TO
APPROXIMATELY 475 KM/S) AND DENSITY (47 P/CC) AT ABOUT 01/1200Z. NO
MAGNETIC CLOUD SIGNATURE WAS PRESENT IN BZ. THE SOLAR WIND
PARAMETERS ABOVE POINT TO A CME CAUSE OF THE DISTURBANCE LATE IN THE
PERIOD. A CME WAS OBSERVED BY A SPACE-BASED CORONAGRAPH EARLY ON 27
APR.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT UNSETTLED TO MINOR STORM LEVELS FOR THE REST OF 01
MAY AND THE FIRST HALF OF 02 MAY AS THE CME FINISHES ITS TRANSIT BY
THE EARTH. QUIET TO UNSETTLED CONDITIONS ARE EXPECTED FOR THE
REMAINDER OF THE FORECAST PERIOD.
III. Event Probabilities 02 MAY to 04 MAY
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 01 MAY 072 Predicted 02 MAY-04 MAY 073/075/076 90 Day Mean 01 MAY 074
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 APR 013/011 ESTIMATED AFR/AP 01 MAY 015/012 PREDICTED AFR/AP 02 MAY-04 MAY 015/012-010/008-008/008
VI. Geomagnetic Activity Probabilities 02 MAY to 04 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 15% |
| Minor storm | 10% | 05% | 01% |
| Major-severe storm | 05% | 01% | 01% |
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