ALFVENIC WAVE HEATING OF THE UPPER CHROMOSPHERE IN FLARE

作者：Reep J W; Russell A J B

来源：Astrophysical Journal Letters, 2016, 818(1): L20.

DOI：10.3847/2041-8205/818/1/L20

• Sun: atmosphere
• Sun: chromosphere
• Sun: corona
• Sun: flares
• Sun: transition region
• waves

We have developed a numerical model of flare heating due to the dissipation of Alfvenic 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) Alfvenic 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 Alfvenic waves can be strikingly similar to heating by an electron beam, and (3) this heating can produce explosive evaporation.

• 出版日期2016-2-10