Viewing archive of Saturday, 21 October 2017
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Reports
Solar activity
Auroral activity
Kp values
Solar wind (Speed, Density), Interplanetary Magnetic Field (IMF) (Bt, Bz)
Aurora Observations
Coronal hole faces Earth
A large southern extension of the northern hemisphere polar coronal hole is facing Earth today.
M1.1 solar flare from behind the east limb
A huge surprise last evening as solar activity unexpectedly reached moderate level thanks to an M1.11 (R1-minor) solar flare that took place behind the east limb. The solar flare peaked at 23:28 UTC on 20 October 2017.
Latest news
Monday, 30 March 2026
X1.5 solar flare
Tuesday, 17 March 2026
M2.7 solar flare, CME arrival possible
Sunday, 1 February 2026
Complex sunspot region 4366
Latest forum messages
X1.5 CME (2026-03-30) 163AR4405 90Space Weather Watch App 6Comet C/2026 A1 (MAPS) for the southern hemisphere 26Photographing auroras 239
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Space weather facts
| Last X-flare | 2026/03/30 | X1.4 |
| Last M-flare | 2026/03/28 | M1.3 |
| Last geomagnetic storm | 2026/03/25 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (3%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2026 | 78.2 -34.3 |
| March 2026 | 88.4 +10.2 |
| Last 30 days | 88.4 +14.9 |
This day in history*
Aurora on this day in history
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