Viewing archive of Thursday, 29 July 1999
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 1999 Jul 29 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 210 Issued at 2200Z on 29 JUL 1999IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z SOLAR ACTIVITY WAS HIGH. REGION 8651 (N24E49) PRODUCED
A VERY IMPULSIVE M5/1N FLARE AT 29/1936Z WITH SMALL CENTIMETRIC
BURSTS. THIS REGION EXHIBITED GROWTH IN BOTH WHITE LIGHT AND H-ALPHA
IMAGERY AND PLAGE COVERAGE WAS NEAR FLARE INTENSITY DURING THE
LATTER STAGES OF THE PERIOD. REGION 8645 (S24E10) PRODUCED AN M1/2N
FLARE AT 29/1656Z. THIS REGION HAS CONTINUED TO DEVELOP, COVERING
590 MILLIONTHS OF WHITE LIGHT AREA IN AN F-TYPE GROUP WITH
MODERATE MAGNETIC COMPLEXITY. REGION 8649 (S15W16) CONTINUES TO
PRODUCE FREQUENT SMALL FLARES BUT NO SUBSTANTIAL GROWTH WAS
OBSERVED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE. REGIONS 8645 AND 8651 WILL LIKELY PRODUCE FURTHER M-CLASS
ACTIVITY WITH AN OUTSIDE CHANCE OF AN X-CLASS EVENT. REGIONS 8647
(S18E11), 8649, AND 8636 (N20W82) HAVE SMALLER POTENTIAL FOR AN
M-CLASS.
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN AT QUIET TO UNSETTLED CONDITIONS FOR DAY ONE.
OCCASIONAL ACTIVE CONDITIONS ARE POSSIBLE ON DAYS TWO AND THREE IN
RESPONSE TO THE M-CLASS/CME EVENTS IN REGION 8649 ON EARLY 28 JUL.
III. Event Probabilities 30 JUL to 01 AUG
| Class M | 80% | 80% | 80% |
| Class X | 15% | 15% | 15% |
| Proton | 15% | 15% | 15% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 29 JUL 202 Predicted 30 JUL-01 AUG 200/190/180 90 Day Mean 29 JUL 160
V. Geomagnetic A Indices
OBSERVED AFR/AP 28 JUL 007/009 ESTIMATED AFR/AP 29 JUL 010/008 PREDICTED AFR/AP 30 JUL-01 AUG 010/010-012/010-005/010
VI. Geomagnetic Activity Probabilities 30 JUL to 01 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 35% | 25% |
| Minor storm | 05% | 10% | 05% |
| Major-severe storm | 01% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 40% | 30% |
| Minor storm | 10% | 15% | 10% |
| Major-severe storm | 05% | 10% | 05% |
All times in UTC
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