Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.229..325h&link_type=abstract
Astrophysics and Space Science, Volume 229, Issue 2, pp.325-339
Astronomy and Astrophysics
Astrophysics
8
Scientific paper
From theH αfiltergram observations obtained at Ganyu station, identification and statistic works made for Ellerman bombs, it is found that they often occur in the superpenumbra area of a mature sunspot. We suggest a plasmoid model to account for the basic properties of a typical bomb: lifetime 11 min, diameter ˜ 5 × 107 cm, accompanying jet velocity ˜ 40 km/s, total energy ˜ 1027 erg,Te ˜ 104 K. First, a numerical simulation is made to prove that plasmoids can be lifted from the solar convective zone by magnetic buoyancy. Between the plasmoid and its surroundings a strong current sheet builds up in which a peculiar MHD (with plasma ponderamotive force) - resistive instability takes place. After the magnetic reconnection has begun, a local explosive instability ensues whose growth rate is so high that it allows the exhaustion of the ‘high temperature’ particles from the sheet in a short period. In this way, the temperature of a bomb may be kept unchanged or only rise slightly.
Hu Fu-Min
Li Xue-Qian
Song Mu-Tao
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