Parallel-cascade-based mechanisms for heating solar coronal loops: test against observations

Bo Li, Haixia Xie, Xing Li, Li-Dong Xia

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

14 Dyfyniadau(SciVal)
40 Wedi eu Llwytho i Lawr (Pure)


The heating of solar coronal loops is at the center of the problem of coronal heating. Given that the origin of the fast solar wind has been tracked down to atmospheric layers with transition region or even chromospheric temperatures, it is worthy attempting to address whether the mechanisms proposed to provide the basal heating of the solar wind apply to coronal loops as well. We extend the loop studies based on a classical parallel-cascade scenario originally proposed in the solar wind context by considering the effects of loop expansion, and perform a parametric study to directly contrast the computed loop densities and electron temperatures with those measured by TRACE and YOHKOH/SXT. This comparison yields that with the wave amplitudes observationally constrained by SUMER measurements, while the computed loops may account for a significant fraction of SXT loops, they seem too hot when compared with TRACE loops. Lowering the wave amplitudes does not solve this discrepancy, introducing magnetic twist will make the comparison even less desirable. We conclude that the nanoflare heating scenario better explains ultraviolet loops, while turbulence-based steady heating mechanisms may be at work in heating a fraction of soft X-ray loops.
Iaith wreiddiolSaesneg
Tudalennau (o-i)155-155
Nifer y tudalennau1
CyfnodolynAstronomical Society of the Pacific Conference Series
StatwsCyhoeddwyd - 01 Meh 2014
Digwyddiad8th International Conference of Numerical Modeling of Space Pasma Flows (ASTRONUM 2013) - Biarritz, Ffrainc
Hyd: 01 Gorff 201305 Gorff 2013

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