Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...648..712h&link_type=abstract
The Astrophysical Journal, Volume 648, Issue 1, pp. 712-721.
Astronomy and Astrophysics
Astronomy
10
Sun: Activity, Sun: Corona, Sun: Flares, Sun: Magnetic Fields
Scientific paper
We have observed two types of coronal bidirectional flows in a flare with a small energy release through a spectroscopic observation of the Fe X emission line at 6374 Å with a ground-based coronagraph at the Norikura Solar Observatory. We find a bidirectional flow of +/-3 km s-1 above the top of a flare loop. Remarkable increases of the line intensity and line width are not observed in the flow. From the loop geometry and sign of the Fe X Doppler velocity we conclude that the bidirectional flow is reconnection inflow above the flare loop. We estimate the reconnection rate to be ~0.003 for this event. The other bidirectional flow is observed along postflare loops with significant increases of the line intensity and Doppler velocity. This flow is interpreted as a cooling upflow having a velocity of ~10 km s-1 along a postflare loop from its lower part. We also find that the increase of the nonthermal line width in the loop-top region starts when the line intensity reaches its peak. This supports the presence of a mechanism to enhance turbulent plasma motions in the loop-top region.
Delaboudinière Jean Pierre
Hara Hirohisa
Ichimoto Kiyoshi
Nishino Yohei
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