Viewing archive of Tuesday, 27 April 1999
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 1999 Apr 27 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 117 Issued at 0245Z on 27 APR 1999 This report is compiled from data received at SWO on 26 APRA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0416 0416 0417 130
B. Proton Events
None
C. Geomagnetic Activity Summary
THE GEOMAGNETIC FIELD WAS QUIET
UNTIL 26/1000Z. ACTIVITY INCREASED SLIGHTLY DURING THE REMAINDER OF
THE DAY WITH BRIEF, INTERMITTENT ACTIVE TO MINOR STORM PERIODS (THE
MINOR STORM PERIODS WERE LIMITED TO HIGH LATITUDES).
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 CM 105 SSN 069 AFR/AP 006/008 X-RAY BACKGROUND A9.1 DAILY PROTON FLUENCE (FLUX ACCUMULATION OVER 24 HRS) GT 1 MEV 1.3E+06 GT 10 MEV 1.1E+05 P/(CM2-STER-DAY) (GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES) DAILY ELECTRON FLUENCE GT 2 MEV 2.00E+07 E/(CM2-STER-DAY) (GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES) 3 HOUR K-INDICES: BOULDER 1 0 1 3 3 2 2 1 PLANETARY 1 0 1 3 3 3 2 1
F. Comments
None
All times in UTC
Latest news
Thursday, 16 January 2025
Coronal hole faces Earth
Saturday, 4 January 2025
Sunspot region 3947, X-class solar flares
Monday, 30 December 2024
Two earth-directed coronal mass ejections
Latest forum messages
Filaments and prominences 623Strong far side CME 368Unexplained proton activity 46Comet C/2024 G3 (ATLAS) in LASCO C3 27Space Weather Memes 655
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 | 2025/01/04 | X1.85 |
| Last M-flare | 2025/01/22 | M1.3 |
| Last geomagnetic storm | 2025/01/04 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| December 2024 | 154.5 +2 |
| January 2025 | 145.2 -9.3 |
| Last 30 days | 163.2 +45.8 |