skip to main content

Title: ALFVÉNIC WAVE HEATING OF THE UPPER CHROMOSPHERE IN FLARES

We have developed a numerical model of flare heating due to the dissipation of Alfvénic waves propagating from the corona to the chromosphere. With this model, we present an investigation of the key parameters of these waves on the energy transport, heating, and subsequent dynamics. For sufficiently high frequencies and perpendicular wave numbers, the waves dissipate significantly in the upper chromosphere, strongly heating it to flare temperatures. This heating can then drive strong chromospheric evaporation, bringing hot and dense plasma to the corona. We therefore find three important conclusions: (1) Alfvénic waves, propagating from the corona to the chromosphere, are capable of heating the upper chromosphere and the corona, (2) the atmospheric response to heating due to the dissipation of Alfvénic waves can be strikingly similar to heating by an electron beam, and (3) this heating can produce explosive evaporation.
Authors:
 [1] ;  [2]
  1. National Research Council Post-Doc Program, Naval Research Laboratory, Washington, DC 20375 (United States)
  2. Division of Mathematics, University of Dundee, Nethergate, Dundee, DD1 4HN (United Kingdom)
Publication Date:
OSTI Identifier:
22518614
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 818; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALFVEN WAVES; CHROMOSPHERE; EVAPORATION; HEATING; PLASMA; POWER TRANSMISSION; SOLAR CORONA; SOLAR FLARES; SUN; WAVE PROPAGATION