Observation and numerical modeling of chromospheric evaporation during the impulsive phase of a solar flare

DOI PDF 被引用文献13件 参考文献36件
  • Shinsuke Imada
    Nagoya University 1 Institute for Space-Earth Environmental Research, , Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
  • Izumi Murakami
    National Institute for Fusion Science 2 , 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
  • Tetsuya Watanabe
    National Astronomical Observatory of Japan 4 , Mitaka, Tokyo 181-8588, Japan

抄録

<jats:p>We have studied the chromospheric evaporation flow during the impulsive phase of the flare by using the Hinode/EUV Imaging Spectrometer observation and 1D hydrodynamic numerical simulation coupled to the time-dependent ionization. The observation clearly shows that the strong redshift can be observed at the base of the flaring loop only during the impulsive phase. We performed two different numerical simulations to reproduce the strong downflows in FeXII and FeXV during the impulsive phase. By changing the thermal conduction coefficient, we carried out the numerical calculation of chromospheric evaporation in the thermal conduction dominant regime (conductivity coefficient κ0 = classical value) and the enthalpy flux dominant regime (κ0 = 0.1 × classical value). The chromospheric evaporation calculation in the enthalpy flux dominant regime could reproduce the strong redshift at the base of the flare during the impulsive phase. This result might indicate that the thermal conduction can be strongly suppressed in some cases of flare. We also find that time-dependent ionization effect is important to reproduce the strong downflows in Fe XII and Fe XV.</jats:p>

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