Viewing archive of Thursday, 27 May 2004
Solar activity report
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 2004 May 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 148 Issued at 2200Z on 27 May 2004IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z
Solar activity was at low levels today. Region 618
(S10W27) produced a C1/Sf flare that occurred at 27/0027Z. This
region continued to show decay in magnetic complexity and sunspot
area during the period. The delta structure near region center
remains intact. Region 619 (S09W89) managed to produce a C1 flare
just before the sunspots vanished in white light. No new regions
were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
low levels. Region 618 continues to exhibit the potential for
producing isolated M-class flares.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic field was at quiet to unsettled levels.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet to unsettled levels. NOTE: The ACE
spacecraft orbit will bring ACE nearly in line with the Sun from
about May 30 to June 2, 2004. During that time solar radio noise is
expected to interfere with spacecraft telemetry resulting in the
loss of solar wind plasma, magnetic field, and particle data.
III. Event Probabilities 28 May to 30 May
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 May 102 Predicted 28 May-30 May 100/100/105 90 Day Mean 27 May 105
V. Geomagnetic A Indices
Observed Afr/Ap 26 May 003/006 Estimated Afr/Ap 27 May 004/008 Predicted Afr/Ap 28 May-30 May 004/010-004/010-008/012
VI. Geomagnetic Activity Probabilities 28 May to 30 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 05% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 25% |
| Minor storm | 10% | 10% | 15% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
Latest news
Wednesday, 14 May 2025
Another X-flare! Potent sunspot region 4087!
Tuesday, 13 May 2025
X1.1 solar flare from sunspot region 4086
Tuesday, 15 April 2025
CME arrival, G3 storm watch
Latest forum messages
AR14097 1AR4087 214Growth of Cycle 25 900Incoming & Unnumbered Active Regions 1904Upper atmosphere phenomena Red sprites and Blue jets 25
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!
Space weather facts
| Last X-flare | 2025/05/14 | X2.7 |
| Last M-flare | 2025/05/21 | M1.2 |
| Last geomagnetic storm | 2025/05/17 | Kp6+ (G2) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2025 | 140.6 +6.4 |
| May 2025 | 69.6 -71 |
| Last 30 days | 85.3 -28.3 |