Viewing archive of Saturday, 4 April 2026
Solar activity report
Report of Solar-Geophysical Activity 2026 Apr 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 94 Issued at 2200Z on 04 Apr 2026IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity has been at high levels for the past 24 hours.
There are currently 7 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(05 Apr, 06 Apr, 07 Apr).
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic
field has been at quiet to major storm levels for the past 24 hours.
Solar wind speed reached a peak of 742 km/s at 03/2132Z. Total IMF
reached 6 nT at 03/2107Z. The maximum southward component of Bz reached
-4 nT at 03/2257Z. Protons greater than 10 MeV at geosynchronous orbit
reached a peak level of 3 pfu at 03/2145Z. Electrons greater than 2 MeV
at geosynchronous orbit reached a peak level of 2418 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (05 Apr) and quiet to
unsettled levels on days two and three (06 Apr, 07 Apr). Protons have a
slight chance of crossing threshold on days one, two, and three (05 Apr,
06 Apr, 07 Apr).
III. Event Probabilities 05 Apr to 07 Apr
| Class M | 55% | 55% | 55% |
| Class X | 20% | 20% | 20% |
| Proton | 20% | 20% | 20% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Apr 128 Predicted 05 Apr-07 Apr 125/125/120 90 Day Mean 04 Apr 138
V. Geomagnetic A Indices
Observed Afr/Ap 03 Apr 025/049 Estimated Afr/Ap 04 Apr 019/025 Predicted Afr/Ap 05 Apr-07 Apr 011/015-010/010-008/008
VI. Geomagnetic Activity Probabilities 05 Apr to 07 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 15% | 15% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 25% | 25% |
| Major-severe storm | 40% | 25% | 25% |
All times in UTC
Latest news
Wednesday, 1 July 2026
X1.1 solar flare, G2 watch
Thursday, 4 June 2026
G3 geomagnetic storm watch for 4 and 5 June
Wednesday, 13 May 2026
Coronal hole faces Earth
Latest forum messages
Incoming & Unnumbered Active Regions 557Current Farside Activity 717Filaments and prominences 587GOES-19 Safe Hold 6Space Weather Memes 858
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Solar activity or if there is a chance to see the aurora, but with more traffic comes higher costs to keep the servers online. If you like SpaceWeatherLive and want to support the project you can choose a subscription for an ad-free site or consider a donation. With your help we can keep SpaceWeatherLive online!
Space weather facts
| Last X-flare | 2026/07/04 | X1.3 |
| Last M-flare | 2026/07/12 | M1.19 |
| Last geomagnetic storm | 2026/07/04 | Kp7+ (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| June 2026 | 94.4 -7.1 |
| July 2026 | 74.8 -19.6 |
| Last 30 days | 87 -20.2 |
This day in history*
Aurora on this day in history
No observations submitted for this day in history. If you've observed the aurora and you have some amazing photos to show off, submit your observations now!
Submit your aurora observation