Viewing archive of Thursday, 18 March 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Mar 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 77 Issued at 2200Z on 18 Mar 2021IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z
Solar activity has been at very low levels for the past 24
hours. There is currently 1 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
on days one, two, and three (19 Mar, 20 Mar, 21 Mar).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 350 km/s at 18/0235Z. Total IMF reached 5 nT at
17/2134Z. The maximum southward component of Bz reached -3 nT at
18/0233Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1500 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (19 Mar) and unsettled to
minor storm levels on days two and three (20 Mar, 21 Mar).
III. Event Probabilities 19 Mar to 21 Mar
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Mar 073 Predicted 19 Mar-21 Mar 072/072/072 90 Day Mean 18 Mar 077
V. Geomagnetic A Indices
Observed Afr/Ap 17 Mar 002/004 Estimated Afr/Ap 18 Mar 006/005 Predicted Afr/Ap 19 Mar-21 Mar 008/012-018/024-015/020
VI. Geomagnetic Activity Probabilities 19 Mar to 21 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 40% | 35% |
| Minor storm | 15% | 25% | 15% |
| Major-severe storm | 01% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 15% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 35% | 60% | 25% |
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
Anchorage, AK, Fairbanks, AK, Juneau, AKLatest news
Friday, 28 March 2025
X1.1 solar flare
Monday, 24 March 2025
Coronal hole faces Earth
Saturday, 22 March 2025
Strong G3 geomagnetic storm watch for 23 March
Latest forum messages
Incoming & Unnumbered Active Regions 1661Unspecified geomagnetic activity 2221AR4048 114New satellites - Proba-3, PUNCH, SWFO-L1, GOES-U/19 36Filaments and prominences 750
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!
Latest alerts
10:00 UTC - Hemispheric Power Index
The OVATION model predicts the Hemispheric Power Index to reach 78GW at 10:32 UTC
04:15 UTC - Geomagnetic activity
Minor G1 geomagnetic storm (Kp5) Threshold Reached: 04:05 UTC
03:15 UTC - Geomagnetic activity
Moderate G2 geomagnetic storm (Kp6) Threshold Reached: 02:59 UTC
01:00 UTC - Geomagnetic activity
Minor G1 geomagnetic storm (Kp5) Threshold Reached: 00:51 UTC
Friday, 4 April 2025
23:30 UTC - Geomagnetic activity
Minor G1 geomagnetic storm (Kp5) Threshold Reached: 23:17 UTC
Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/01 | M2.5 |
| Last geomagnetic storm | 2025/04/04 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2025 | 134.2 -20.4 |
| April 2025 | 148 +13.8 |
| Last 30 days | 130.9 -15.2 |