Viewing archive of Friday, 18 December 1998
Geophysical 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.
Solar and Geophysical Activity Summary 1998 Dec 18 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 352 Issued at 0245Z on 18 DEC 1998 This report is compiled from data received at SWO on 17 DECA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0740 0745 0749 8409 S27W46 M3.2 1N 6500 200 II 1412 1418 1422 8409 S28W51 C7.2 SN 610 96 II 1458 1458 1458 130 1746 1753 1757 8415 N17E70 C6.4 1F 110 31 1809 1815 1837 8408 S16W66 C4.5 SF 190
B. Proton Events
None
C. Geomagnetic Activity Summary
QUIET
D. Stratwarm
STRATWARM ALERT/THURSDAY/STRATWARM EXISTS.
MAJOR WARMING EXISTS.
A STRONG ANTICYCLONE AND A VERY INTENSE WARMING OVER THE SI-
BERIAN/CANADIAN ARCTIC DOMINATE THE POLAR REGION AND DISPLA-
CE THE VORTEX CENTRE TO THE CENTRAL URAL AREA. MEAN ZONAL
WIND AT 60N IS FROM EAST AT 10HPA AND ABOVE IN THE UPPER
STRATOSPHERE AND THE TEMPERATURE GRADIENT REVERSED BETWEEN
60N AND THE POLE IN THE WHOLE STRATOSPHERE.
E. Daily Indices: (real-time preliminary/estimated values)
10 CM 146 SSN 093 AFR/AP 000/002 X-RAY BACKGROUND B5.8 DAILY PROTON FLUENCE (FLUX ACCUMULATION OVER 24 HRS) GT 1 MEV 1.7E+05 GT 10 MEV 1.6E+04 P/(CM2-STER-DAY) (GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES) DAILY ELECTRON FLUENCE GT 2 MEV 1.00E+07 E/(CM2-STER-DAY) (GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES) 3 HOUR K-INDICES: BOULDER 0 0 1 0 0 1 0 0 PLANETARY 0 0 0 0 0 1 1 0
F. Comments
None
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
sun goes blank 43AR13889 136AR13883 2024/11/04 CME 43Incoming & Unnumbered Active Regions 1204AR 3878 176
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 | 2024/11/11 | M1.3 |
| 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 | 175.7 +9.3 |
| Last 30 days | 166.1 +21.7 |