Viewing archive of måndag, 27 februari 2012


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 Feb 27 2200 UTC
Skapad av NOAA © SWPC och bearbetad av

USAF/NOAA rapport för sol- och geofysisk aktivitet

SDF Nummer 058 publicerat klockan 2200Z på 27 Feb 2012

IA. Analys av solfläcksgrupper och solaktivitet från 26-2100Z till 27-2100Z

Solar activity was low during the past 24 hours. There was one C-class flare, a C2/Sf at 26/2141Z from the spotless plage Region 1421 (N14E62). Region 1423 (N18E15) is the largest group on the disk but is small and unimpressive. A filament eruption was observed over the north-east limb in the SDO AIA 304 imagery at about 27/1433Z and appears to be associated with a CME seen in LASCO imagery over the north pole. Another CME was noted in LASCO at 27/2012Z over the west limb but STEREO-A EUVI images clearly show that the solar source region behind the west limb. Neither of these CMEs are expected to be geoeffective.
IB. Prognos för solaktivitet
Solar activity is expected to be very low. There is, however, a slight chance for an isolated C-class flare.
IIA. Sammanfattning av geofysisk aktivitet 26-2100Z till 27-2100Z
The geomagnetic field ranged from quiet to minor storm levels with an isolated period of major storm levels at high latitude. A weak shock passed the ACE spacecraft at 26/2058Z and was followed by a sudden impulse at Earth at 26/2141Z. Unsettled to active levels prevailed for the subsequent nine hours, followed by about nine hours of mostly quiet levels. However, solar wind data showed a sustained interval of moderately negative Bz from about 1000-1800Z and conditions increased to active levels from 1200-2100Z with a minor storm period during the last three hours of the interval. The timing and solar wind signatures suggest that disturbance is most likely due to passage of the CME that was initiated early on 24 February. The greater than 10 MeV protons continued to be elevated but were on the decline during the day with end-of-period values less than 1 PFU. Further analysis and comparison with ACE EPAM and ACE SIS show that these particles were likely also associated with the 24 February CME.
IIB. Prognos för geofysisk aktivitet
The geomagnetic field is expected to be generally unsettled for the first day (28 February) as effects from the current disturbance persist. Predominantly quiet levels are expected for the second and third days (29 February - 01 March).
III. Chans för solutbrott från 28 Feb till 01 Mar
IV. Penticton 10.7 cm Flux
  Observerad       27 Feb 106
  Prognoserat   28 Feb-01 Mar  105/105/105
  90 Day Mean        27 Feb 128
V. Geomagnetiskt A-index
  Observerad Afr/Ap 26 Feb  007/006
  Förväntat     Afr/Ap 27 Feb  013/016
  Prognoserat    Afr/Ap 28 Feb-01 Mar  009/010-006/005-006/005
VI. Chanser för geomagnetisk aktivitet från 28 Feb till 01 Mar
A. Medelhöga breddgrader
Små stormförhållanden05%01%01%
Svåra stormförhållanden01%01%01%
B. Höga breddgrader
Små stormförhållanden15%10%10%
Svåra stormförhållanden05%05%05%

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