Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21632002l&link_type=abstract
American Astronomical Society, AAS Meeting #216, #320.02; Bulletin of the American Astronomical Society, Vol. 41, p.910
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the deflation of EUV coronal loops overlying active regions during different flare phases, i.e., slow shrinkage at about 5 km/s initiating during the flare preheating phase, and fast contraction at about 100 km/s during the flare impulsive as well as gradual phases. The deflation is a manifestation of the release of the free magnetic energy and the consequent decrease of the magnetic pressure in the flaring region, dubbed "coronal implosion” by Hudson. In particular, it is expected to occur in eruptions in which the arcade field is only partially opened up. In that case, free magnetic energy transfers from the core field to the overlying arcade when the confining field lines are pushed upward and aside. The energy transferred is then made available to trapped particles as the stretched field lines that have not reconnected relax in the aftermath of this partial eruption. The trapped particles gain energy from the increase in parallel momentum, due to shortening field lines, and from the increase in perpendicular momentum, due to strengthening magnetic fields at lower altitudes. This particle acceleration mechanism may contribute to late-phase hard X-ray bursts. In addition, coronal implosion is demonstrated to be a new exciter mechanism for coronal loop oscillations.
Liu Rui
Wang Hai-Hong
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