Viewing archive of Monday, 29 March 2021
Daily bulletin on solar and geomagnetic activity from the SIDC
Issued: 2021 Mar 29 1241 UTC
SIDC Forecast
Solar flares
Quiet conditions (<50% probability of C-class flares)
Geomagnetism
Quiet (A<20 and K<4)
Solar protons
Quiet
| 10cm flux | Ap | |
|---|---|---|
| 29 Mar 2021 | 076 | 003 |
| 30 Mar 2021 | 076 | 004 |
| 31 Mar 2021 | 076 | 007 |
Bulletin
Solar activity was at low levels over the past 24 hours. The sunspot (Catania 83, NOAA-AR 2812) did not produce any significant flare (above B-class). Solar activity is expected to remain at low levels.
No Earth-directed coronal mass ejections (CMEs) was observed in the available coronagraph imagery.
The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux was below the 1000 pfu threshold in the past 24 hours and is expected to remain so during the next 24 hours. The 24h electron fluence is at normal levels in the last 24 hours and is expected to stay at normal levels for the next 24 hours.
Over the past 24 hours the solar wind parameters (ACE and DSCOVR) showed mostly nominal values: The solar wind speed decreased from 400 to 320 km/s . The interplanetary magnetic field magnitude was below 5 nT, and Bz component varied between -3 nT and 3 nT. The interplanetary magnetic field phi angle had a mostly negative polarity (towards the Sun). Slight enhancement due to the high-speed stream associated with the small patchy equatorial coronal holes (in the south hemisphere, with negative polarity) is possible but not very likely.
Geomagnetic conditions were quiet (Kp and K-Dourbes: 0-2). Mostly quiet geomagnetic conditions are expected for the next 24 hours.
Today's estimated international sunspot number (ISN): 011, based on 23 stations.Solar indices for 28 Mar 2021
| Wolf number Catania | /// |
| 10cm solar flux | 075 |
| AK Chambon La Forêt | 008 |
| AK Wingst | 007 |
| Estimated Ap | 005 |
| Estimated international sunspot number | 011 - Based on 22 stations |
Noticeable events summary
| Day | Begin | Max | End | Loc | Strength | OP | 10cm | Catania/NOAA | Radio burst types | |
|---|---|---|---|---|---|---|---|---|---|---|
| None | ||||||||||
Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive
All times in UTC
Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future
Norilsk, VorkutaLatest news
X1.1 solar flare
Coronal hole faces Earth
Strong G3 geomagnetic storm watch for 23 March
Latest forum messages
Support 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!
Latest alerts
15:15 UTC - Geomagnetic activity
Minor G1 geomagnetic storm (Kp5) Threshold Reached: 14:59 UTC
06:30 UTC - Type II Radio Emission
Begin Time: 08/04/2025 05:53 UTC Estimated Velocity: 456km/sec.
05:15 UTC - Hemispheric Power Index
The OVATION model predicts the Hemispheric Power Index to reach 50GW at 06:02 UTC
00:55 UTC - Coronal hole
A southern hemisphere coronal hole is facing Earth. Enhanced solar wind could arrive in ~3 days
Monday, 7 April 2025
20:45 UTC - Geomagnetic activity
Active geomagnetic conditions (Kp4) Threshold Reached: 20:39 UTC
Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/05 | M1.0 |
| Last geomagnetic storm | 2025/04/06 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2025 | 134.2 -20.4 |
| April 2025 | 151.3 +17.1 |
| Last 30 days | 135.2 -4.5 |