Viewing archive of Saturday, 18 March 2023
Solar activity report
Report of Solar-Geophysical Activity 2023 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 2023IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z
Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C9 event observed at
18/0716Z from Region 3256 (S22E66). There are currently 3 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares 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 to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 472 km/s at 18/0334Z. Total IMF reached 6
nT at 18/1556Z. The maximum southward component of Bz reached -5 nT at
18/0339Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 198 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (19 Mar) and quiet to
active levels on days two and three (20 Mar, 21 Mar).
III. Event Probabilities 19 Mar to 21 Mar
| Class M | 25% | 25% | 25% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Mar 140 Predicted 19 Mar-21 Mar 138/138/138 90 Day Mean 18 Mar 170
V. Geomagnetic A Indices
Observed Afr/Ap 17 Mar 007/006 Estimated Afr/Ap 18 Mar 008/009 Predicted Afr/Ap 19 Mar-21 Mar 006/005-011/015-015/018
VI. Geomagnetic Activity Probabilities 19 Mar to 21 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 30% | 35% |
| Minor storm | 01% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 30% | 30% |
| Major-severe storm | 20% | 45% | 50% |
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
Rovaniemi, Sodankylä, UtsjokiReykjavik
Kirkenes, Tromsø
Murmansk
Kiruna
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| Last M-flare | 2025/03/27 | M2.0 |
| Last geomagnetic storm | 2025/03/26 | Kp6+ (G2) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
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| Last 30 days | 131.2 -21.8 |