Incoherent Solar Radio Emission
Incoherent solar radio radiation comes from the free-free, gyroresonance, and gyrosynchrotron emission mechanisms. Free-free is primarily produced from Coulomb collisions between thermal electrons and ions. Gyroresonance and gyrosynchrotron result from the acceleration of low-energy electrons and mi...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2020-11-01
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| Series: | Frontiers in Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fspas.2020.00057/full |
| _version_ | 1818346232265834496 |
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| author | Alexander Nindos |
| author_facet | Alexander Nindos |
| author_sort | Alexander Nindos |
| collection | DOAJ |
| description | Incoherent solar radio radiation comes from the free-free, gyroresonance, and gyrosynchrotron emission mechanisms. Free-free is primarily produced from Coulomb collisions between thermal electrons and ions. Gyroresonance and gyrosynchrotron result from the acceleration of low-energy electrons and mildly relativistic electrons, respectively, in the presence of a magnetic field. In the non-flaring Sun, free-free is the dominant emission mechanism with the exception of regions of strong magnetic fields which emit gyroresonance at microwaves. Due to its ubiquitous presence, free-free emission can be used to probe the non-flaring solar atmosphere above temperature minimum. Gyroresonance opacity depends strongly on the magnetic field strength and orientation; hence it provides a unique tool for the estimation of coronal magnetic fields. Gyrosynchrotron is the primary emission mechanism in flares at frequencies higher than 1–2 GHz and depends on the properties of both the magnetic field and the accelerated electrons, as well as the properties of the ambient plasma. In this paper we discuss in detail the above mechanisms and their diagnostic potential. |
| first_indexed | 2024-12-13T17:15:00Z |
| format | Article |
| id | doaj.art-ba3d7890e4524eeca903cdf124f186e2 |
| institution | Directory Open Access Journal |
| issn | 2296-987X |
| language | English |
| last_indexed | 2024-12-13T17:15:00Z |
| publishDate | 2020-11-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Astronomy and Space Sciences |
| spelling | doaj.art-ba3d7890e4524eeca903cdf124f186e22022-12-21T23:37:27ZengFrontiers Media S.A.Frontiers in Astronomy and Space Sciences2296-987X2020-11-01710.3389/fspas.2020.00057572227Incoherent Solar Radio EmissionAlexander NindosIncoherent solar radio radiation comes from the free-free, gyroresonance, and gyrosynchrotron emission mechanisms. Free-free is primarily produced from Coulomb collisions between thermal electrons and ions. Gyroresonance and gyrosynchrotron result from the acceleration of low-energy electrons and mildly relativistic electrons, respectively, in the presence of a magnetic field. In the non-flaring Sun, free-free is the dominant emission mechanism with the exception of regions of strong magnetic fields which emit gyroresonance at microwaves. Due to its ubiquitous presence, free-free emission can be used to probe the non-flaring solar atmosphere above temperature minimum. Gyroresonance opacity depends strongly on the magnetic field strength and orientation; hence it provides a unique tool for the estimation of coronal magnetic fields. Gyrosynchrotron is the primary emission mechanism in flares at frequencies higher than 1–2 GHz and depends on the properties of both the magnetic field and the accelerated electrons, as well as the properties of the ambient plasma. In this paper we discuss in detail the above mechanisms and their diagnostic potential.https://www.frontiersin.org/articles/10.3389/fspas.2020.00057/fullSunsolar radio emissionchromospherecoronaquiet Sunactive regions |
| spellingShingle | Alexander Nindos Incoherent Solar Radio Emission Frontiers in Astronomy and Space Sciences Sun solar radio emission chromosphere corona quiet Sun active regions |
| title | Incoherent Solar Radio Emission |
| title_full | Incoherent Solar Radio Emission |
| title_fullStr | Incoherent Solar Radio Emission |
| title_full_unstemmed | Incoherent Solar Radio Emission |
| title_short | Incoherent Solar Radio Emission |
| title_sort | incoherent solar radio emission |
| topic | Sun solar radio emission chromosphere corona quiet Sun active regions |
| url | https://www.frontiersin.org/articles/10.3389/fspas.2020.00057/full |
| work_keys_str_mv | AT alexandernindos incoherentsolarradioemission |