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Hinode and IRIS observations of the magnetohydrodynamic waves propagating from the photosphere to the chromosphere in a sunspot  

Ryuichi Kanoh   Submitted: 2016-08-18 21:34

Magnetohydrodynamic (MHD) waves have been considered as energy sources for heating the solar chromosphere and the corona. Although MHD waves have been observed in the solar atmosphere, there are lack of quantitative estimates on the energy transfer and dissipation in the atmosphere. We performed simultaneous Hinode and IRIS observations of a sunspot umbra to derive the upward energy fluxes at two different atmospheric layers (photosphere and lower transition region) and estimate the energy dissipation. The observations revealed some properties of the observed periodic oscillations in physical quantities, such as their phase relations, temporal behaviors, and power spectra, making a conclusion that standing slow-mode waves are dominant at the photosphere with their high frequency leakage, which is observed as upward waves at the chromosphere and the lower transition region. Our estimate of upward energy fluxes are 2.0x107 erg cm-2 s-1 at the photospheric level and 8.3x104 erg cm-2 s-1 at the lower transition region level. The difference between the energy fluxes is larger than the energy required to maintain the chromosphere in the sunspot umbrae, suggesting that the observed waves can make a crucial contribution to the heating of the chromosphere in the sunspot umbrae. In contrast, the upward energy flux derived at the lower transition region level is smaller than the energy flux required for heating the corona, implying that we may need another heating mechanisms. We should, however, note a possibility that the energy dissipated at the chromosphere might be overestimated because of the opacity effect.

Authors: Ryuichi Kanoh, Toshifumi Shimizu, Shinsuke Imada
Projects: Hinode/SOT,IRIS

Publication Status: accepted for publication in ApJ
Last Modified: 2016-08-23 16:20
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Hinode and IRIS observations of the magnetohydrodynamic waves propagating from the photosphere to the chromosphere in a sunspot

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