A Scenario for Origin of Global 4 mHz Oscillations in Solar Corona

Li Xue; Cheng-Liang Jiao; Li-Xin Zhang

doi:10.3390/universe11010014

paper

A Scenario for Origin of Global 4 mHz Oscillations in Solar Corona

arXiv:2501.02753 · doi:10.3390/universe11010014

Abstract

We establish a spherically symmetric model of solar atmosphere, which consists of the whole chromosphere and low corona below the $1.25$ solar radius. It is a hydrodynamic model with heating in the chromosphere through an artificial energy flux. We performed a series of simulations with our model and found oscillations with a peak frequency of $\sim$ 4 $mHz$ in the power spectrum. We confirmed that this resulted from the $p$ -mode excited in the transition region and amplified in a resonant cavity situated in the height range $\sim$ $4 \times 1 0^{3}$ -- $2 \times 1 0^{4}$ km. This result is consistent with global observations of Alfvénic waves in corona and can naturally explain the observational ubiquity of $4 mHz$ without the difficulty of the $p$ -mode passing through the acoustic-damping chromosphere. We also confirmed that acoustic shock waves alone cannot heat the corona to the observed temperature, and found mass upflows in the height range $\sim$ $7 \times 1 0^{3}$ -- $7 \times 1 0^{4}$ km in our model, which pumped the dense and cool plasma into the corona and might be the mass supplier for solar prominences.

21 pages, 8 figures

A Scenario for Origin of Global 4 mHz Oscillations in Solar Corona

Abstract

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