Viewing archive of Sunday, 11 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 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 192 Issued at 2200Z on 11 JUL 1999IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS LOW. THE LARGEST EVENT WAS A C3/1N
FROM REGION 8628 (N18E21) AT 11/0009UT. THIS EVENT WAS ACCOMPANIED
BY MINOR RADIO, INCLUDING A TYPE II SWEEP. REGION 8628 IS GROWING
SLOWLY AND SHOWING SOME MAGNETIC COMPLEXITY. NUMEROUS SUBFLARES
WERE ALSO OBSERVED FROM REGIONS 8626 (S20W70) AND 8615 (S30W55).
NEW REGION 8631 (N10E78) APPEARS TO BE THE RETURN OF REGION 8604
(N12 L-050). REGION 8632 (S20W57) IS SLOWLY EMERGING. ALSO OF NOTE
IS THE EXTENDED REGION 8627 (S14E33).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
C-CLASS FLARE ACTIVITY IS LIKELY FROM REGIONS 8615, 8626, 8627, AND
8628. AN ISOLATED M-CLASS FLARE IS POSSIBLE.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET.
III. Event Probabilities 12 JUL to 14 JUL
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 JUL 153 Predicted 12 JUL-14 JUL 150/149/147 90 Day Mean 11 JUL 151
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 JUL 004/005 ESTIMATED AFR/AP 11 JUL 005/005 PREDICTED AFR/AP 12 JUL-14 JUL 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 12 JUL to 14 JUL
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
Latest news
Thursday, 21 November 2024
Major far side eruption, S1 radiation storm
Monday, 11 November 2024
Coronal hole faces Earth
Friday, 1 November 2024
X2.0 solar flare
Latest forum messages
Double Thread Rules 1Strong far side CME 227Filaments and prominences 536AR 13901 116Incoming & Unnumbered Active Regions 1249
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 | 2024/11/06 | X2.39 |
| Last M-flare | 2024/11/20 | M1.1 |
| Last geomagnetic storm | 2024/11/10 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| October 2024 | 166.4 +25 |
| November 2024 | 142.9 -23.5 |
| Last 30 days | 155.8 +4.5 |