A Scenario for Origin of Global 4 mHz Oscillations in Solar Corona
We establish a spherically symmetric model of solar atmosphere, which consists of the whole chromosphere and low corona below the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>1.25</mn>&l...
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| author | Li Xue Chengliang Jiao Lixin Zhang |
| author_facet | Li Xue Chengliang Jiao Lixin Zhang |
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| description | We establish a spherically symmetric model of solar atmosphere, which consists of the whole chromosphere and low corona below the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>1.25</mn></mrow></semantics></math></inline-formula> 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 ∼4 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>mHz</mi></semantics></math></inline-formula> in the power spectrum. We confirmed that this resulted from the <i>p</i>-mode excited in the transition region and amplified in a resonant cavity situated in the height range ∼<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>4</mn><mo>×</mo><msup><mn>10</mn><mn>3</mn></msup></mrow></semantics></math></inline-formula>–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>2</mn><mo>×</mo><msup><mn>10</mn><mn>4</mn></msup></mrow></semantics></math></inline-formula> km. This result is consistent with global observations of Alfvénic waves in corona and can naturally explain the observational ubiquity of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>4</mn><mspace width="2pt"></mspace><mi>mHz</mi></mrow></semantics></math></inline-formula> without the difficulty of the <i>p</i>-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 ∼<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>7</mn><mo>×</mo><msup><mn>10</mn><mn>3</mn></msup></mrow></semantics></math></inline-formula>–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>7</mn><mo>×</mo><msup><mn>10</mn><mn>4</mn></msup></mrow></semantics></math></inline-formula> km in our model, which pumped the dense and cool plasma into the corona and might be the mass supplier for solar prominences. |
| format | Article |
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| spelling | doaj-art-4cdaa987c95c4e9c9731e448d8e8d0cd2025-01-24T13:51:29ZengMDPI AGUniverse2218-19972025-01-011111410.3390/universe11010014A Scenario for Origin of Global 4 mHz Oscillations in Solar CoronaLi Xue0Chengliang Jiao1Lixin Zhang2Department of Astronomy, Xiamen Univesity, Xiamen 361005, ChinaYunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, ChinaDepartment of Astronomy, Xiamen Univesity, Xiamen 361005, ChinaWe establish a spherically symmetric model of solar atmosphere, which consists of the whole chromosphere and low corona below the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>1.25</mn></mrow></semantics></math></inline-formula> 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 ∼4 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>mHz</mi></semantics></math></inline-formula> in the power spectrum. We confirmed that this resulted from the <i>p</i>-mode excited in the transition region and amplified in a resonant cavity situated in the height range ∼<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>4</mn><mo>×</mo><msup><mn>10</mn><mn>3</mn></msup></mrow></semantics></math></inline-formula>–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>2</mn><mo>×</mo><msup><mn>10</mn><mn>4</mn></msup></mrow></semantics></math></inline-formula> km. This result is consistent with global observations of Alfvénic waves in corona and can naturally explain the observational ubiquity of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>4</mn><mspace width="2pt"></mspace><mi>mHz</mi></mrow></semantics></math></inline-formula> without the difficulty of the <i>p</i>-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 ∼<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>7</mn><mo>×</mo><msup><mn>10</mn><mn>3</mn></msup></mrow></semantics></math></inline-formula>–<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>7</mn><mo>×</mo><msup><mn>10</mn><mn>4</mn></msup></mrow></semantics></math></inline-formula> km in our model, which pumped the dense and cool plasma into the corona and might be the mass supplier for solar prominences.https://www.mdpi.com/2218-1997/11/1/14hydrodynamicsmethods: numericalsun: atmospheresun: corona |
| spellingShingle | Li Xue Chengliang Jiao Lixin Zhang A Scenario for Origin of Global 4 mHz Oscillations in Solar Corona Universe hydrodynamics methods: numerical sun: atmosphere sun: corona |
| title | A Scenario for Origin of Global 4 mHz Oscillations in Solar Corona |
| title_full | A Scenario for Origin of Global 4 mHz Oscillations in Solar Corona |
| title_fullStr | A Scenario for Origin of Global 4 mHz Oscillations in Solar Corona |
| title_full_unstemmed | A Scenario for Origin of Global 4 mHz Oscillations in Solar Corona |
| title_short | A Scenario for Origin of Global 4 mHz Oscillations in Solar Corona |
| title_sort | scenario for origin of global 4 mhz oscillations in solar corona |
| topic | hydrodynamics methods: numerical sun: atmosphere sun: corona |
| url | https://www.mdpi.com/2218-1997/11/1/14 |
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