Further Evidences of Multiple Acceleration of Solar Energetic Particles

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Further Evidences of Multiple Acceleration of
Solar Energetic Particles

• A.B. Struminskya,b,c and I.V. Zimovetsa,b
• (a) Space Research Institute, Profsoyuznaya st.,
  84/32, Moscow, 117997, Russia
• (b) Moscow Institute of Physics and Technology,
  Dolgoprudny, Moscow region, Russia
• (c) IZMIRAN, Troitsk, Moscow region, 142092,
  Russia

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INTRODUCTION

• The prolonged neutral emission registered by
  different instruments in June 1991, till the
  solar extreme events (SEE) of October 2003, was a
  sole fact proving existence of gt100 MeV protons
  deep in the Sun during hours.
• This report summarizes further evidences of
  multiple acceleration of protons based on
  observations of SEEs in 2003 and 2005.
• The count rate of the Anti-Coincidence System
  (ACS) of SPectrometer on INTEGRAL (SPI), which is
  sensitive to primary ?-rays above 100 keV as
  well as to charged particles and secondary ?-rays
  from interaction in the telescope and satellite
  structure,
• The ACS count rate was above background for a
  rather long time during the events of 28 October
  2003, 20 January 2005 and 07 September 2005,
  (i.e. does not contradict to the possibility of
  prolonged solar ?-ray emission) possibly
  indicating different acceleration episodes, the
  source of solar energetic particles extended in
  space and time.
• Two episodes of the prolonged neutron production
  might occur in the solar atmosphere on 28 October
  2003.
• The proton intensities time profiles observed on
  20 January 2005 provide evidences for two
  episodes of proton acceleration separated by
  about 30 minutes.
• The ?-ray event of 07 September 2005 (S06E89),
  observed by INTEGRAL well before the solar proton
  onset, clearly shows several ?-ray peaks and
  should be crucial for interpretation of previous
  events.

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ACS counts GOES protons, 07 September 2005
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28 October 2003 07 September 2005
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ACS counts GOES protons,20 January 2005