Viewing archive of måndag, 18 april 2011
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 2011 Apr 18 2200 UTCSkapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com
USAF/NOAA rapport för sol- och geofysisk aktivitet
SDF Nummer 108 publicerat klockan 2200Z på 18 Apr 2011IA. Analys av solfläcksgrupper och solaktivitet från 17-2100Z till 18-2100Z Solar activity has been at low levels for the past 24
hours. Region 1193 (N17E05) has been the most active, producing two
low-level C-class events. Region 1193 has remained rather stable but
continues to grow in sunspot number and magnetic complexity. At
18/0348Z, a C1 flare was observed off the west limb. There was a
non-earth directed CME associated with this event visible in LASCO
C2 imagery at 18/0412Z.
IB. Prognos för solaktivitet
Solar activity is expected to be at
low levels with a chance for M-class events for the next three days
(19-21 April). Region 1190 (N13W68) is expected to rotate off the
visible disk in the next two days, while a new flux Region, visible
in STEREO Behind EIT imagery, is forecast to rotate onto the
southeast limb early on 19 April.
IIA. Sammanfattning av geofysisk aktivitet 17-2100Z till 18-2100Z
The geomagnetic field has been at quiet to unsettled levels for the
past 24 hours. Quiet levels were observed till around 18/0634Z when
a 24 nT Sudden Impulse (SI) was observed by the Boulder
magnetometer. Following the arrival of this shock, mostly unsettled
levels were observed at mid latitudes with isolated active periods
at high latitudes. This increase in activity was due to the arrival
of a slow moving CME, observed lifting off the solar disk on 15
April.
IIB. Prognos för geofysisk aktivitet
The geomagnetic field is
expected to be at quiet levels on day 1 (19 April). An increase to
unsettled geomagnetic levels with a chance for active periods is
expected on days 2 and 3 (20-21 April), due to the forecasted
arrival of a coronal hole high speed stream.
III. Chans för solutbrott från 19 Apr till 21 Apr
| M-klass | 20% | 20% | 20% |
| X-klass | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observerad 18 Apr 111 Prognoserat 19 Apr-21 Apr 115/115/115 90 Day Mean 18 Apr 104
V. Geomagnetiskt A-index
Observerad Afr/Ap 17 Apr 002/005 Förväntat Afr/Ap 18 Apr 007/008 Prognoserat Afr/Ap 19 Apr-21 Apr 005/005-010/010-010/010
VI. Chanser för geomagnetisk aktivitet från 19 Apr till 21 Apr
| A. Medelhöga breddgrader | |||
|---|---|---|---|
| Aktivt | 10% | 35% | 25% |
| Små stormförhållanden | 01% | 10% | 05% |
| Svåra stormförhållanden | 01% | 01% | 01% |
| B. Höga breddgrader | |||
|---|---|---|---|
| Aktivt | 10% | 40% | 30% |
| Små stormförhållanden | 01% | 15% | 10% |
| Svåra stormförhållanden | 01% | 00% | 01% |
All times in UTC
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