Solar activity report

Viewing archive of Wednesday, 11 August 1999

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 Aug 11 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 223 Issued at 2200Z on 11 AUG 1999

IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z

SOLAR ACTIVITY WAS LOW. REGION 8662 (S14E11) PRODUCED A C1/SF AT 10/2208Z. THIS REGION APPEARS TO HAVE STABILIZED, PRODUCING ONLY MINOR FLUCTUATIONS FOR MOST OF THE PERIOD. NEW REGION 8665 (S26E66) WAS NUMBERED TODAY. REMAINING REGIONS WERE QUIET.

IB. Solar Activity Forecast

SOLAR ACTIVITY IS EXPECTED TO REMAIN LOW. REGION 8662 IS THE ONLY REGION LIKELY TO PRODUCE C-CLASS FLARES AND HAS A SLIGHT CHANCE OF AN M-CLASS EVENT.

IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z

THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.

IIB. Geophysical Activity Forecast

THE GEOMAGNETIC FIELD IS EXPECTED TO REMAIN AT QUIET TO UNSETTLED LEVELS.

III. Event Probabilities 12 AUG to 14 AUG

Class M	10%	05%	05%
Class X	01%	01%	01%
Proton	01%	01%	01%
PCAF	GREEN

IV. Penticton 10.7 cm Flux

  Observed       11 AUG 128
  Predicted   12 AUG-14 AUG  130/135/140
  90 Day Mean        11 AUG 164

V. Geomagnetic A Indices

OBSERVED AFR/AP 10 AUG  005/007
ESTIMATED AFR/AP 11 AUG  007/007
PREDICTED AFR/AP 12 AUG-14 AUG  005/007-005/007-005/007

VI. Geomagnetic Activity Probabilities 12 AUG to 14 AUG

A. Middle Latitudes
Active	15%	10%	10%
Minor storm	01%	01%	01%
Major-severe storm	01%	01%	01%

B. High Latitudes
Active	20%	15%	15%
Minor storm	05%	05%	05%
Major-severe storm	01%	01%	01%

All times in UTC

Previous rotation Previous day Calendar

Next day Next rotation

<< Go to daily overview page

The strength of the interplanetary magnetic field is moderate (15.37nT), the direction is North (7.84nT).

The Disturbance Storm Time index predicts moderate storm conditions right now (-92nT)

Latest news

Tuesday, 15 April 2025

CME arrival, G3 storm watch

Friday, 28 March 2025

X1.1 solar flare

Monday, 24 March 2025

Coronal hole faces Earth

More news

Latest forum messages

2025/04/12-13 Filament CMEs 2025/04/16 G3 Watch 458 Power Grid Reclosers 1 AR4062 36 Incoming & Unnumbered Active Regions 1741 AR4064 8

Support 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!

Donate SpaceWeatherLive Pro