Catastrophic cooling and cessation of heating in the solar corona

Details Catastrophic cooling and cessation of heating in the solar corona Catastrophic cooling and cessation of heating in the solar corona

2011-12-15

arxiv.org/abs/1112.3667v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Astronomy & Astrophysics, in press, 10 pages, 5 figures

Scientific paper

10.1051/0004-6361/201117889

Condensations in the more than 10^6 K hot corona of the Sun are commonly observed in the extreme ultraviolet (EUV). While their contribution to the total solar EUV radiation is still a matter of debate, these condensations certainly provide a valuable tool for studying the dynamic response of the corona to the heating processes. We investigate different distributions of energy input in time and space to investigate which process is most relevant for understanding these coronal condensations. For a comparison to observations we synthesize EUV emission from a time-dependent, one-dimensional model for coronal loops, where we employ two heating scenarios: simply shutting down the heating and a model where the heating is very concentrated at the loop footpoints, while keeping the total heat input constant. The heating off/on model does not lead to significant EUV count rates that one observes with SDO/AIA. In contrast, the concentration of the heating near the footpoints leads to thermal non-equilibrium near the loop top resulting in the well-known catastrophic cooling. This process gives a good match to observations of coronal condensations. This shows that the corona needs a steady supply of energy to support the coronal plasma, even during coronal condensations. Otherwise the corona would drain very fast, too fast to even form a condensation.

Affiliated with

Also associated with

No associations

Rating

Catastrophic cooling and cessation of heating in the solar corona does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Catastrophic cooling and cessation of heating in the solar corona, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Catastrophic cooling and cessation of heating in the solar corona will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-136134