Vaata pühapäev, 25 juuli 2004 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 2004 Jul 25 2200 UTC
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Ühine USAF / NOAA päikese- ja geofüüsikaalase aktiivsuse aruanne

SDF number 207 Välja antud 2200Z kuni 25 Jul 2004

IA. Päikese aktiivsete piirkondade ja päikeseaktiivsuse analüüs alates 24-2100Z kuni 25-2100Z

Solar activity reached high levels today. Region 652 (N08W35) produced four M-class events, the largest - an M7/2B flare at 25/0551Z. This flare had associated moderate centimetric bursts, including an 819 sfu Tenflare. A Type IV radio sweep also accompanied this flare. No LASCO imagery was available, but it is likely that an Earth-directed CME was associated with this event. Lower, more impulsive M-class flares were observed at 25/0639Z and 25/1349Z. A long duration M1/1f flare erupted in Region 652 at 25/1514Z. Type II (898 km/s) and IV sweeps, and a greater than 10 MeV proton event accompanied this event. An 1818Z LASCO/C3 image exhibits a full halo CME associated with this long duration flare. Region 652 has shown some decay; however, it remains a large and complex beta-gamma-delta sunspot group with white light area coverage exceeding 1200 millionths. New Region 654 (N08E52) was numbered today.
IB. Päikese aktiivsuse ennustus
Solar activity is expected to be moderate to high. Region 652 has decayed somewhat, but still maintains good potential for a major flare.
IIA. Summaarne geofüüsikaline aktiivsus 24-2100Z kuni 25-2100Z
The geomagnetic field was at active to severe storm levels. The shock observed at the ACE spacecraft on 24/0600Z was followed by a prolonged period of southward IMF Bz that lasted through midway on 25 July. Bz ranged from -10 to -20 nT for much of this period, while solar wind speed was elevated in the 550 to 700 km/s range. Consequently, severe geomagnetic storm levels were observed at all latitudes. It is likely that this activity was associated with the complex series of CMEs observed on 22 July. Late in this period, a discontinuity in the solar wind suggested that transient flow from the multiple CME activity on 23 July had arrived. A greater than 10 MeV proton event accompanied the long duration M1 flare and CME. The proton event began at 25/1855Z, and the peak so far was 41 pfu at 25/2100Z. The greater than 2 MeV electron flux at geosynchronous orbit was at high levels today.
IIB. Geofüüsikalise aktiivsuse ennustus
The geomagnetic field is expected to be at unsettled to severe storm levels. Minor to major storm periods are expected on day one as transient flow from the complex 23 July eruptions are expected to persist through much of 26 July. CMEs associated with today's M7 and long duration M1 flares will likely impact the geomagnetic field on 27 July and produce periods of major storming. Storm levels should subside by 28 July; a return to unsettled to active levels is expected by the end of the period. The greater than 10 MeV proton event in progress now, is expected to end on 26 July.
III. Sündmuste tõenäosus 26 Julkuni 28 Jul
Klass M70%65%60%
Klass X20%15%10%
Prooton90%25%10%
PCAFyellow
IV. Pikklaine 10.7 cm kiirgus
  Vaadeldud       25 Jul 145
  Prognoositud   26 Jul-28 Jul  140/140/135
  90 päeva keskmine        25 Jul 105
V. Geomagneetiline A-indeks
  Vaadeldud Afr/Ap 24 Jul  029/027
  Hinnanguline     Afr/Ap 25 Jul  080/090
  Prognoositud    Afr/Ap 26 Jul-28 Jul  050/075-060/055-030/030
VI. Geomagnetilised aktiivsuse tõenäosused 26 Jul kuni 28 Jul
A. Keskmistel laiuskraadidel
Aktiivne35%25%50%
Väike torm40%45%25%
Suur-tõsine torm25%30%10%
B. Kõrgetel laiuskraadidel
Aktiivne20%25%55%
Väike torm50%50%30%
Suur-tõsine torm30%25%15%

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