Viewing archive of Sunday, 28 June 2015
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 2015 Jun 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 179 Issued at 2200Z on 28 Jun 2015IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z
Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
28/1714Z from Region 2373 (N15E67). There are currently 3 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 day one (29 Jun) and
expected to be very low with a chance for a C-class flares on days two
and three (30 Jun, 01 Jul).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
565 km/s at 28/0253Z. Total IMF reached 8 nT at 27/2156Z. The maximum
southward component of Bz reached -7 nT at 27/2219Z. Protons greater
than 10 MeV at geosynchronous orbit reached a peak level of 8 pfu at
28/0215Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 6994 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (29 Jun) and quiet levels
on days two and three (30 Jun, 01 Jul). Protons greater than 10 Mev have
a slight chance of crossing threshold on day one (29 Jun) and have a
slight chance of crossing threshold on day two (30 Jun).
III. Event Probabilities 29 Jun to 01 Jul
| Class M | 60% | 05% | 05% |
| Class X | 20% | 01% | 01% |
| Proton | 20% | 10% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Jun 097 Predicted 29 Jun-01 Jul 100/105/105 90 Day Mean 28 Jun 125
V. Geomagnetic A Indices
Observed Afr/Ap 27 Jun 008/008 Estimated Afr/Ap 28 Jun 010/012 Predicted Afr/Ap 29 Jun-01 Jul 009/008-005/005-006/005
VI. Geomagnetic Activity Probabilities 29 Jun to 01 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 10% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 20% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 25% | 10% | 10% |
All times in UTC
Latest 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
AR4048 105Unexplained proton activity 54AR4046 157Temporary Topic - Ongoing Solar Proton Events 17jsoc 108
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
13:03 UTC - Hemispheric Power Index
The OVATION model predicts the Hemispheric Power Index to reach 50GW at 13:56 UTC
Wednesday, 2 April 2025
04:03 UTC - Hemispheric Power Index
The OVATION model predicts the Hemispheric Power Index to reach 50GW at 04:56 UTC
01:45 UTC - Geomagnetic activity
Active geomagnetic conditions (Kp4) Threshold Reached: 01:32 UTC
Tuesday, 1 April 2025
22:51 UTC - Solar flare
Moderate M2.5 flare
22:30 UTC - Radio Blackout
Minor R1 radio blackout in progress (≥M1 - current: M1.45)
Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/01 | M2.5 |
| Last geomagnetic storm | 2025/03/27 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2025 | 154.6 +17.6 |
| April 2025 | 152.5 -2.1 |
| Last 30 days | 130.7 -17.9 |