Vaata laupäev, 28 aprill 2001 arhiivi
Päikese aktiivsuse aruanne
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.
Päikese ja geofüüsikalise aktiivsuse aruanne 2001 Apr 28 2200 UTCValminud NOAA © SWPC ja töödeldud SpaceWeatherLive.com-iga
Ühine USAF / NOAA päikese- ja geofüüsikaalase aktiivsuse aruanne
SDF number 118 Välja antud 2200Z kuni 28 Apr 2001IA. Päikese aktiivsete piirkondade ja päikeseaktiivsuse analüüs alates 27-2100Z kuni 28-2100Z Solar activity dropped to low levels. Region 9433
(N17W50) produced isolated C-class flares, the largest of which was
a C7/1f at 28/0934 UTC. Gradual decay continued in the leading and
intermediate portions of this region. However, no decay was evident
within its trailing spots, where a strong magnetic delta
configuration remained. Region 9441 (N07E23) continued a gradual
growth phase that began on 27 April, but the region remained a
moderate-sized, simply-structured bipole. New Regions 9444 (S11E67)
and 9445 (N23E76) were assigned.
IB. Päikese aktiivsuse ennustus
Solar activity is expected to be at
moderate to high levels. Region 9433 is expected to produce isolated
M-class flares. This region could also produce an isolated major
flare during the period.
IIA. Summaarne geofüüsikaline aktiivsus 27-2100Z kuni 28-2100Z
Geomagnetic field activity ranged from quiet to minor storm levels.
An interplanetary shock at the leading edge of a CME passed the ACE
spacecraft at 28/0432 UTC, followed by a sudden impulse (SI) at
28/0520 UTC (76 nT, as measured by the Boulder USGS magnetometer).
The source for the CME was an M7/2b flare on 26 April. Field
activity increased to unsettled to minor storm levels following the
SI. The greater than 10 MeV proton flux at geosynchronous orbit
briefly crossed event threshold in response to the shock passage.
The greater than 10 MeV event began at 28/0430 UTC, reached a
maximum of 57 PFU at 28/0500 UTC, then ended at 28/0520 UTC. Proton
fluxes had decreased to near background levels by the close of the
period.
IIB. Geofüüsikalise aktiivsuse ennustus
Geomagnetic field activity is
expected to be at unsettled to active levels through midday, 29
April as the disturbance gradually subsides. Quiet to unsettled
levels are expected for the remainder of the period. Region 9433
could produce another proton flare before it crosses the west limb
on 02 May. The greater than 2 MeV electron flux at geosynchronous
orbit may reach high levels during the first half of the period.
III. Sündmuste tõenäosus 29 Aprkuni 01 May
| Klass M | 75% | 75% | 75% |
| Klass X | 20% | 20% | 20% |
| Prooton | 20% | 20% | 20% |
| PCAF | yellow | ||
IV. Pikklaine 10.7 cm kiirgus
Vaadeldud 28 Apr 188 Prognoositud 29 Apr-01 May 185/180/175 90 päeva keskmine 28 Apr 167
V. Geomagneetiline A-indeks
Vaadeldud Afr/Ap 27 Apr 003/006 Hinnanguline Afr/Ap 28 Apr 026/028 Prognoositud Afr/Ap 29 Apr-01 May 015/015-012/010-010/010
VI. Geomagnetilised aktiivsuse tõenäosused 29 Apr kuni 01 May
| A. Keskmistel laiuskraadidel | |||
|---|---|---|---|
| Aktiivne | 30% | 25% | 20% |
| Väike torm | 15% | 10% | 10% |
| Suur-tõsine torm | 10% | 05% | 01% |
| B. Kõrgetel laiuskraadidel | |||
|---|---|---|---|
| Aktiivne | 35% | 30% | 25% |
| Väike torm | 20% | 15% | 10% |
| Suur-tõsine torm | 15% | 10% | 05% |
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