Physics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21630506b&link_type=abstract
American Astronomical Society, AAS Meeting #216, #305.06; Bulletin of the American Astronomical Society, Vol. 41, p.854
Physics
Scientific paper
Observations of the solar corona and transition region reveal persistent red-shifts, which correspond to down-flowing material. The significance of these flows in an impulsively heated corona is two-fold: firstly, they are responsible for a substantial amount of energy loss from the corona during the cooling phase; secondly, the energy transferred from the corona sustains the transition region against its own radiative losses. Thus, the physics of coronal EUV loops can be understood as the interplay between the importance of energy transfer by enthalpy and the energy loss by radiation. Within this framework we demonstrate that many observed properties of coronal loops can be explained, including: the speed of the down-flows and their variation with density; the persistence of transition region emission for longer than the cooling time-scale; the over-density of coronal loops; and the T - n2 scaling law. We also show how a robust new definition for the transition region, in terms of its energy balance rather than its temperature, can be derived.
Bradshaw Stephen
Cargill Peter J.
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