Solar Chromospheric Heating by Magnetohydrodynamic Waves: Dependence on the Inclination of the Magnetic Field
A proposed mechanism for solar chromospheric heating is magnetohydrodynamic waves propagating upward along magnetic field lines and dissipating their energy in the chromosphere. In particular, compressible magnetoacoustic waves may contribute to the heating. Theoretically, the components below the c...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad343f |
| _version_ | 1797204351069978624 |
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| author | Mayu Koyama Toshifumi Shimizu |
| author_facet | Mayu Koyama Toshifumi Shimizu |
| author_sort | Mayu Koyama |
| collection | DOAJ |
| description | A proposed mechanism for solar chromospheric heating is magnetohydrodynamic waves propagating upward along magnetic field lines and dissipating their energy in the chromosphere. In particular, compressible magnetoacoustic waves may contribute to the heating. Theoretically, the components below the cutoff frequency cannot propagate into the chromosphere; however, the cutoff frequency depends on the inclination of the magnetic field lines. In this study, using high-temporal cadence spectral data of IRIS and Hinode Solar Optical Telescope spectropolarimeter in plages, we investigated the dependence of the low-frequency waves on magnetic field properties and quantitatively estimated the amount of energy dissipation in the chromosphere. The following results were obtained: (a) The amount of energy dissipated by the low-frequency component (3–6 mHz) increases with the inclination of the field below 40°, whereas it decreases as a function of the inclination of the field above 40°. (b) The amount of the energy is enhanced toward 10 ^4 W m ^−2 , which is the energy required for heating in the chromospheric plage regions when the magnetic field is higher than 600 G and inclined more than 40°. (c) In the photosphere, the low-frequency component has much more power in the magnetic field inclined more and weaker than 400 G. The results suggest that the observed low-frequency components can bring the energy along the magnetic field lines and that only a specific range of the inclination angles of the field and the strength of the field may allow the low-frequency component to bring a sufficient amount of the energy into the chromosphere. |
| first_indexed | 2024-04-24T08:33:50Z |
| format | Article |
| id | doaj.art-c570139a045a472dbd7198b549e7863a |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-04-24T08:33:50Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-c570139a045a472dbd7198b549e7863a2024-04-16T18:27:24ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01965213610.3847/1538-4357/ad343fSolar Chromospheric Heating by Magnetohydrodynamic Waves: Dependence on the Inclination of the Magnetic FieldMayu Koyama0Toshifumi Shimizu1https://orcid.org/0000-0003-4764-6856Department of Earth and Planetary Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Institute of Space and Astronautical Science , Japan Aerospace Exploration Agency, 3-1-1 Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan ; shimizu@solar.isas.jaxa.jpDepartment of Earth and Planetary Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Institute of Space and Astronautical Science , Japan Aerospace Exploration Agency, 3-1-1 Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan ; shimizu@solar.isas.jaxa.jpA proposed mechanism for solar chromospheric heating is magnetohydrodynamic waves propagating upward along magnetic field lines and dissipating their energy in the chromosphere. In particular, compressible magnetoacoustic waves may contribute to the heating. Theoretically, the components below the cutoff frequency cannot propagate into the chromosphere; however, the cutoff frequency depends on the inclination of the magnetic field lines. In this study, using high-temporal cadence spectral data of IRIS and Hinode Solar Optical Telescope spectropolarimeter in plages, we investigated the dependence of the low-frequency waves on magnetic field properties and quantitatively estimated the amount of energy dissipation in the chromosphere. The following results were obtained: (a) The amount of energy dissipated by the low-frequency component (3–6 mHz) increases with the inclination of the field below 40°, whereas it decreases as a function of the inclination of the field above 40°. (b) The amount of the energy is enhanced toward 10 ^4 W m ^−2 , which is the energy required for heating in the chromospheric plage regions when the magnetic field is higher than 600 G and inclined more than 40°. (c) In the photosphere, the low-frequency component has much more power in the magnetic field inclined more and weaker than 400 G. The results suggest that the observed low-frequency components can bring the energy along the magnetic field lines and that only a specific range of the inclination angles of the field and the strength of the field may allow the low-frequency component to bring a sufficient amount of the energy into the chromosphere.https://doi.org/10.3847/1538-4357/ad343fSolar physics |
| spellingShingle | Mayu Koyama Toshifumi Shimizu Solar Chromospheric Heating by Magnetohydrodynamic Waves: Dependence on the Inclination of the Magnetic Field The Astrophysical Journal Solar physics |
| title | Solar Chromospheric Heating by Magnetohydrodynamic Waves: Dependence on the Inclination of the Magnetic Field |
| title_full | Solar Chromospheric Heating by Magnetohydrodynamic Waves: Dependence on the Inclination of the Magnetic Field |
| title_fullStr | Solar Chromospheric Heating by Magnetohydrodynamic Waves: Dependence on the Inclination of the Magnetic Field |
| title_full_unstemmed | Solar Chromospheric Heating by Magnetohydrodynamic Waves: Dependence on the Inclination of the Magnetic Field |
| title_short | Solar Chromospheric Heating by Magnetohydrodynamic Waves: Dependence on the Inclination of the Magnetic Field |
| title_sort | solar chromospheric heating by magnetohydrodynamic waves dependence on the inclination of the magnetic field |
| topic | Solar physics |
| url | https://doi.org/10.3847/1538-4357/ad343f |
| work_keys_str_mv | AT mayukoyama solarchromosphericheatingbymagnetohydrodynamicwavesdependenceontheinclinationofthemagneticfield AT toshifumishimizu solarchromosphericheatingbymagnetohydrodynamicwavesdependenceontheinclinationofthemagneticfield |