Viewing archive of torsdag, 17 maj 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 May 17 2200 UTCSkapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com
USAF/NOAA rapport för sol- och geofysisk aktivitet
SDF Nummer 138 publicerat klockan 2200Z på 17 May 2012IA. Analys av solfläcksgrupper och solaktivitet från 16-2100Z till 17-2100Z Solar activity was at high levels due to an M5/1f flare
at 17/0147Z that occurred from Region 1476 (N12W89) as it was
approaching the west limb. Associated with the flare was Type II
(645 km/s) and IV radio sweeps as well as a partial halo CME with an
estimated plane-of-sky speed of approximately 1200 km/s. The
majority of the ejecta was directed off the west limb as seen in
SOHO/LASCO C3 imagery beginning at 17/0206Z, however a shock
enhancement in the interplanetary magnetic field is expected from
the event. Further analysis is pending.
IB. Prognos för solaktivitet
Solar activity is expected to be at
predominantly low levels with a slight chance for M-class activity
for all three days of the period (18 - 20 May).
IIA. Sammanfattning av geofysisk aktivitet 16-2100Z till 17-2100Z
The geomagnetic field was at quiet to active levels. An isolated
active period was observed during the 16/2100Z - 2400Z period due to
a prolonged southward period of the Bz component of the
interplanetary magnetic field. A >10 MeV and >100 MeV proton event
at geosynchronous orbit was observed associated with the M5 flare.
The >10 MeV event began at 17/0210Z, crossed the 100 pfu threshold
(S2) at 17/0245Z, reached a max of 255 pfu at 17/0430Z, and fell
below 100 pfu at 17/0945Z. The greater than 100 MeV proton event
began at 17/0200Z and reached a max of 20.4 pfu. Both events were
still in progress at the time of this report.
IIB. Prognos för geofysisk aktivitet
The geomagnetic field is
expected to be mostly quiet during the first half of day 1 (18 May).
Around mid to late on day 1, a shock arrival is expected from the
partial halo CME associated with the 17 May M5 flare. Active to
minor storm conditions are expected. Early on day 2 (19 May),
unsettled to active conditions are expected, returning to quiet to
unsettled levels by the end of the day. Quiet to unsettled
conditions are expected on day 3 (20 May).
III. Chans för solutbrott från 18 May till 20 May
| M-klass | 20% | 10% | 10% |
| X-klass | 05% | 01% | 01% |
| Proton | 70% | 20% | 05% |
| PCAF | yellow | ||
IV. Penticton 10.7 cm Flux
Observerad 17 May 136 Prognoserat 18 May-20 May 135/135/135 90 Day Mean 17 May 115
V. Geomagnetiskt A-index
Observerad Afr/Ap 16 May 008/009 Förväntat Afr/Ap 17 May 006/006 Prognoserat Afr/Ap 18 May-20 May 011/015-010/008-007/005
VI. Chanser för geomagnetisk aktivitet från 18 May till 20 May
| A. Medelhöga breddgrader | |||
|---|---|---|---|
| Aktivt | 35% | 30% | 10% |
| Små stormförhållanden | 25% | 15% | 05% |
| Svåra stormförhållanden | 10% | 05% | 01% |
| B. Höga breddgrader | |||
|---|---|---|---|
| Aktivt | 35% | 35% | 15% |
| Små stormförhållanden | 40% | 25% | 10% |
| Svåra stormförhållanden | 15% | 10% | 05% |
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Rymdvädersfakta
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