Viewing archive of Wednesday, 5 May 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 May 05 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 125 Issued at 2200Z on 05 MAY 1999IA. Analysis of Solar Active Regions and Activity from 04-2100Z to 05-2100Z SOLAR ACTIVITY WAS LOW, PRODUCING ONLY FOUR C1 X-RAY
EVENTS DURING THE PERIOD. ALL FOUR EVENTS WERE OPTICALLY
UNCORRELATED. THE LARGEST REGION ON THE DISK, 8525 (N18W02),
REMAINED STABLE AND SHOWED VERY LITTLE ACTIVITY. THE REST OF THE
REGIONS WERE ALSO STABLE AND MOSTLY QUIET. THREE NEW REGIONS WERE
NUMBERED: 8532 (S40W14), 8533 (N05E74), AND 8534 (S18E74).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW.
IIA. Geophysical Activity Summary 04-2100Z to 05-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. A SUDDEN IMPULSE OF 8
NT WAS OBSERVED AT 05/1542UT BY THE BOULDER USGS MAGNETOMETER. NO
SIGNIFICANT GEOMAGNETIC EFFECT WAS NOTED AS BZ REMAINED
PREDOMINATELY NORTHWARD AFTER THE SUDDEN IMPULSE. THE GREATER THAN 2
MEV ELECTRONS AT GEOSYNCHRONOUS ORBIT WERE AT HIGH LEVELS ALL DAY.
THE GREATER THAN 10 MEV PROTONS AT GEOSYNCHRONOUS ORBIT REACHED
THRESHOLD LEVELS AT 05/1820UT AND REMAINED AT HIGH LEVELS FOR THE
REST OF THE DAY.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET TO UNSETTLED.
III. Event Probabilities 06 MAY to 08 MAY
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 05 MAY 141 Predicted 06 MAY-08 MAY 140/140/135 90 Day Mean 05 MAY 129
V. Geomagnetic A Indices
OBSERVED AFR/AP 04 MAY 003/006 ESTIMATED AFR/AP 05 MAY 006/006 PREDICTED AFR/AP 06 MAY-08 MAY 015/015-015/015-010/010
VI. Geomagnetic Activity Probabilities 06 MAY to 08 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 20% | 20% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 30% |
| Minor storm | 25% | 25% | 20% |
| Major-severe storm | 01% | 01% | 01% |
Latest news
Monday, 22 April 2024
Lot's of sunspots! Big chance for major flare activity?
Saturday, 23 March 2024
X1.1 solar flare with earth-directed CME
Wednesday, 20 March 2024
Sunspot region 3615, G1 watch
Latest forum messages
IMF - BT strength 5What are these long and thin eruptions? 6AR 3637, 3638, 3643 89Unproven theories 341Space Weather Memes 338
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!
Space weather facts
| Last X-flare | 2024/03/28 | X1.1 |
| Last M-flare | 2024/04/25 | M1.3 |
| Last geomagnetic storm | 2024/04/19 | Kp7 (G3) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2024 | 104.9 -19.8 |
| Last 30 days | 135.5 +27.6 |