Viewing archive of fredag, 28 september 2012
Solaktivitetsrapport
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.
Rapport för sol- och geofysisk aktivitet 2012 Sep 28 2200 UTCSkapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com
USAF/NOAA rapport för sol- och geofysisk aktivitet
SDF Nummer 272 publicerat klockan 2200Z på 28 Sep 2012IA. Analys av solfläcksgrupper och solaktivitet från 27-2100Z till 28-2100Z Solar activity was at low levels. Region 1577 (N08W41)
produced a long duration C3/1f flare at 27/2357Z. The event began
with a filament eruption located northwest of and adjacent to the
region with a subsequent dual ribbon flare. Associated with this
event was an Earth-directed, asymmetric, full-halo CME first visible
in SOHO LASCO C2 and C3 imagery at 28/0018Z and 28/0030Z,
respectively. The plane-of-sky speed through both fields averaged
1034 km/s with a computed radial velocity of 872 km/s. Little
change was observed for the remainder of the disk and limb. No
other Earth-directed CMEs were observed.
IB. Prognos för solaktivitet
Solar activity is expected to be at
low levels with a slight chance for M-class activity all three days
of the forecast period (29 - 30 September and 01 October).
IIA. Sammanfattning av geofysisk aktivitet 27-2100Z till 28-2100Z
The geomagnetic field was at quiet levels. ACE satellite
measurements indicated a steady decline in wind velocity from about
400 km/s to near 325 km/s while the Bz component of the
interplanetary magnetic field did not vary much beyond +/- 2 nT.
The greater than 10 MeV proton flux at geosynchronous orbit exceeded
threshold at 28/0300Z, reached a maximum of 28 pfu at 28/0445Z and
decayed below threshold at 28/1040Z. At the time of this report,
flux levels were still elevated at about 5 pfu. This event was
believed to be associated with the C3/1f flare observed late on 27
September.
IIB. Prognos för geofysisk aktivitet
Geomagnetic field activity is
expected to be at predominately quiet levels on day one (29
September) and through midday on day two (30 September). By late
on day two, active levels with a chance for minor to major storm
periods are expected due to the arrival of the Earth-directed CME
observed early on 28 September. On day three (01 October),
continued minor to major storm conditions are expected early in the
day, decreasing to mostly quiet to unsettled levels with isolated
active periods as effects from the CME wane.
III. Chans för solutbrott från 29 Sep till 01 Oct
| M-klass | 10% | 10% | 10% |
| X-klass | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observerad 28 Sep 138 Prognoserat 29 Sep-01 Oct 135/135/130 90 Day Mean 28 Sep 125
V. Geomagnetiskt A-index
Observerad Afr/Ap 27 Sep 003/004 Förväntat Afr/Ap 28 Sep 002/003 Prognoserat Afr/Ap 29 Sep-01 Oct 004/005-018/035-018/025
VI. Chanser för geomagnetisk aktivitet från 29 Sep till 01 Oct
| A. Medelhöga breddgrader | |||
|---|---|---|---|
| Aktivt | 05% | 35% | 35% |
| Små stormförhållanden | 01% | 25% | 30% |
| Svåra stormförhållanden | 01% | 05% | 05% |
| B. Höga breddgrader | |||
|---|---|---|---|
| Aktivt | 15% | 10% | 10% |
| Små stormförhållanden | 15% | 25% | 25% |
| Svåra stormförhållanden | 05% | 50% | 65% |
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