Viewing archive of Friday, 2 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 02 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.comJoint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 183 Issued at 2200Z on 02 JUL 1999
IA. Analysis of Solar Active Regions and Activity from 01-2100Z to 02-2100Z
SOLAR ACTIVITY RETURNED TO MODERATE LEVELS. REGION 8598
(N23W80) CONTINUED TO SLOWLY DECAY AS IT NEARED THE WEST LIMB, BUT
WAS ABLE TO PRODUCE AN IMPULSIVE M1/1F FLARE AT 01/2143Z ASSOCIATED
WITH MINOR RADIO EMISSION. REGION 8603 (S14W37) DISPLAYED LITTLE
CHANGE AND REMAINED MODERATE IN SIZE AND MAGNETIC COMPLEXITY. IT
PRODUCED AN M1/1N FLARE AT 01/2331Z AND A FEW SUBFLARES, NONE OF
WHICH WERE ASSOCIATED WITH SIGNIFICANT RADIO EMISSION. REGION 8611
(S25W06) RETAINED MODERATE MAGNETIC COMPLEXITY AND WAS THE LARGEST
(APPROX. AREA 400 MILLIONTHS) AND MOST ACTIVE OF THE VISIBLE
REGIONS. IT PRODUCED TWO M-CLASS FLARES: AN M2/1B AT 02/0138Z AND AN
M1/SF 02/1520Z, BOTH OF WHICH WERE ACCOMPANIED BY MINOR RADIO
EMISSION. NEW REGIONS 8616 (N30W73) AND 8617 (N14W28) WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
MODERATE WITH A GOOD CHANCE FOR ISOLATED, LOW-LEVEL M-CLASS FLARES.
IIA. Geophysical Activity Summary 01-2100Z to 02-2100Z
GEOMAGNETIC FIELD ACTIVITY RANGED FROM QUIET TO MINOR STORM LEVELS.
THE ACE SPACECRAFT DETECTED AN INTERPLANETARY SHOCK PASSAGE AT L1 AT
02/0024Z FOLLOWED BY A SUDDEN IMPULSE AT EARTH AT 02/0101Z (48 NT,
AS MEASURED BY THE BOULDER USGS MAGNETOMETER). UNSETTLED TO ACTIVE
LEVELS OCCURRED DURING THE REMAINDER OF THE PERIOD WITH A BRIEF
INCREASE TO MINOR STORM LEVELS DURING THE 02/1500-1800Z INTERVAL.
THE SOURCE OF THIS ACTIVITY WAS LIKELY A HALO-CME OBSERVED ON 30
JUNE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT QUIET TO ACTIVE LEVELS DURING THE FIRST DAY, THEN
DECREASE TO QUIET TO UNSETTLED LEVELS FOR THE BALANCE OF THE PERIOD.
III. Event Probabilities 03 JUL to 05 JUL
Class M | 60% | 60% | 60% |
Class X | 10% | 10% | 10% |
Proton | 10% | 10% | 10% |
PCAF | GREEN
|
IV. Penticton 10.7 cm Flux
Observed 02 JUL 187
Predicted 03 JUL-05 JUL 180/175/165
90 Day Mean 02 JUL 148
V. Geomagnetic A Indices
OBSERVED AFR/AP 01 JUL 006/009
ESTIMATED AFR/AP 02 JUL 022/024
PREDICTED AFR/AP 03 JUL-05 JUL 012/015-008/012-008/012
VI. Geomagnetic Activity Probabilities 03 JUL to 05 JUL
A. Middle Latitudes |
Active | 20% | 15% | 15% |
Minor storm | 10% | 05% | 05% |
Major-severe storm | 01% | 01% | 01% |
B. High Latitudes |
Active | 25% | 20% | 20% |
Minor storm | 15% | 10% | 10% |
Major-severe storm | 01% | 01% | 01% |
All times in UTC
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