Viewing archive of Sunday, 26 December 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 Dec 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 360 Issued at 2200Z on 26 DEC 1999IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY CONTINUED AT LOW LEVELS. REGION 8806
(N21W41) REMAINED LARGE AND MAGNETICALLY COMPLEX WITH MINOR GROWTH
REPORTED IN THE TRAILER PORTION OF THE REGION. IT PRODUCED ISOLATED,
LOW-LEVEL C-CLASS SUBFLARES DURING THE PERIOD. REGION 8810 (N36E54)
ALSO PRODUCED ISOLATED SUBFLARES, BUT SHOWED NO SIGNIFICANT CHANGES.
IT REMAINED A MODERATE-SIZED E-TYPE REGION WITH A SIMPLE BIPOLAR
STRUCTURE. NO NEW REGIONS WERE ASSIGNED DURING THE PERIOD.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. THERE CONTINUES TO BE A FAIR CHANCE FOR AN ISOLATED
M-CLASS FLARE FROM REGION 8806, AND A SLIGHT CHANCE FOR A MAJOR
FLARE OR PROTON-PRODUCING FLARE.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT MOSTLY QUIET LEVELS THROUGH THE PERIOD.
III. Event Probabilities 27 DEC to 29 DEC
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 DEC 177 Predicted 27 DEC-29 DEC 175/170/170 90 Day Mean 26 DEC 175
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 DEC 010/010 ESTIMATED AFR/AP 26 DEC 003/005 PREDICTED AFR/AP 27 DEC-29 DEC 007/010-007/007-007/007
VI. Geomagnetic Activity Probabilities 27 DEC to 29 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
Latest news
Monday, 11 November 2024
Coronal hole faces Earth
Friday, 1 November 2024
X2.0 solar flare
Wednesday, 9 October 2024
X1.8 solar flare, severe geomagnetic storm watch
Latest forum messages
Unspecified geomagnetic activity 1643Space Weather Memes 571sun goes blank 75AR13883 2024/11/04 CME 45Incoming & Unnumbered Active Regions 1209
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 | 2024/11/13 | M1.7 |
| 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 | 166 -0.4 |
| Last 30 days | 163.2 +18.4 |