short comment: Direct precipitation Trapping

1
short comment Direct precipitation? Trapping?
S. Masuda (STEL, Nagoya Univ.)
Questions How many electrons do directly
precipitate into footpoints? How are physical
parameters of the trapping region? Density S
patial relationship with a SXR flare loop
2
TOF analysis (Aschwanden et al. 1996)
3
High-frequency component direct
precipitation Low-frequency component trap and
precipitation
Trapping region (assuming only collisional
deflection)
Ne 1 - 2 1011 cm-3
Consistent with the peak density derived from
SXT images
?
4
06-Nov-1997 flare
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1sec
1sec
6
HXR source motion
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Interpretations

• without trapping
• It takes a longer time (one second) to
  accelerate higher
• energy electrons.
• with trapping
• This time-lag is due to difference of the
  collisional
• deflation time when electrons are trapped in
  the
• magnetic loop.
• almost no direct precipitation in the H-band
• Higher energy electrons have relatively larger
  pitch
• angles than those of lower energy electrons.