Effect of Newtonian Cooling on Waves in a Magnetized Isothermal Atmosphere

Banerjee, Dipankar ; Hasan, S. S. ; Christensen-Dalsgaard, J. (1997) Effect of Newtonian Cooling on Waves in a Magnetized Isothermal Atmosphere Solar Physics, 172 (1/2). pp. 53-60. ISSN 0038-0938

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Official URL: http://doi.org/10.1023/A:1004934624358

Related URL: http://dx.doi.org/10.1023/A:1004934624358


We examine the influence of nonadiabatic effects on the modes of an isothermal stratified magnetic atmosphere. The present investigation is a continuation of earlier work by Hasan and Christensen-Dalsgaard (1992) and Banerjee, Hasan, and Christensen-Dalsgaard (1995, 1996), where the interaction of various elementary modes in a stratified magnetized atmosphere was studied in the purely adiabatic limit. The inclusion of radiative dissipation based on Newton's law of cooling demonstrates the importance of this effect in the study of magnetoatmospheric waves. We analyze the physical nature of magnetoacoustic gravity (or MAG) oscillations in the presence of Newtonian cooling and find that the eigenfrequency curves in the diagnostic diagram, as in the previous analysis, undergo avoided crossings. However, the qualitative nature of the mode interaction is strongly influenced by radiative dissipation, which leads to strong mode damping in the avoided-crossing regions. We demonstrate this effect for the interaction between the Lamb mode and a magnetic mode. Our results could be important in the analysis of waves in flux tubes on the Sun.

Item Type:Article
Source:Copyright of this article belongs to Springer Nature Switzerland AG.
Keywords:Atmosphere; Previous Analysis; Elementary Mode; Physical Nature; Mode Interaction.
ID Code:115831
Deposited On:18 Mar 2021 05:35
Last Modified:18 Mar 2021 05:35

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