Temporal and Spatial Characteristics of Hard X-Ray Sources in a Flare Model with a Vertical Current Sheet
We analyzed changes in the height of the coronal hard X-ray (HXR) source for flares SOL2013-05-13T01:50 and SOL2013-05-13T15:51. Analysis of the Reuven Ramaty High Energy Solar Spectroscopic Imager data revealed the downward motion of the HXR source and the separation of the sources by energy and he...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/acea5e |
| _version_ | 1797697980667527168 |
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| author | Alexander N. Shabalin Evgeniia P. Ovchinnikova Yuri E. Charikov |
| author_facet | Alexander N. Shabalin Evgeniia P. Ovchinnikova Yuri E. Charikov |
| author_sort | Alexander N. Shabalin |
| collection | DOAJ |
| description | We analyzed changes in the height of the coronal hard X-ray (HXR) source for flares SOL2013-05-13T01:50 and SOL2013-05-13T15:51. Analysis of the Reuven Ramaty High Energy Solar Spectroscopic Imager data revealed the downward motion of the HXR source and the separation of the sources by energy and height. In the early stages of the flares, a negative correlation was found between the HXR source area in the corona and HXR flux. For the SOL2013-05-13T15:51 event, an increasing trend in the time delay spectra at the footpoints was obtained. For both events, the spectra of the time delays in the coronal HXR source showed a decreasing trend with energy in certain flare phases. To interpret the observed phenomena, we considered a flare model of collapsing traps and calculated the distribution functions of accelerated electrons along the magnetic loop using a nonstationary relativistic kinetic equation. This approach considers betatron and Fermi first-order acceleration mechanisms. The increasing trend of the time delay spectra at the footpoints was explained by the high mirror ratio in the magnetic loop and betatron acceleration mechanism. The observed features in the spatial and temporal behavior of the HXR sources, such as the negative correlation between the HXR source area and HXR flux, can be interpreted by the collapsing trap model. |
| first_indexed | 2024-03-12T03:47:38Z |
| format | Article |
| id | doaj.art-91dc7e26a0744739a511a8c15435fd19 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:47:38Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-91dc7e26a0744739a511a8c15435fd192023-09-03T12:38:27ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195415810.3847/1538-4357/acea5eTemporal and Spatial Characteristics of Hard X-Ray Sources in a Flare Model with a Vertical Current SheetAlexander N. Shabalin0https://orcid.org/0000-0003-3938-0146Evgeniia P. Ovchinnikova1https://orcid.org/0000-0001-7892-093XYuri E. Charikov2https://orcid.org/0000-0002-6693-5613Ioffe Institute , Russian Academy of Sciences, Saint-Petersburg 194021, RussiaIoffe Institute , Russian Academy of Sciences, Saint-Petersburg 194021, RussiaIoffe Institute , Russian Academy of Sciences, Saint-Petersburg 194021, RussiaWe analyzed changes in the height of the coronal hard X-ray (HXR) source for flares SOL2013-05-13T01:50 and SOL2013-05-13T15:51. Analysis of the Reuven Ramaty High Energy Solar Spectroscopic Imager data revealed the downward motion of the HXR source and the separation of the sources by energy and height. In the early stages of the flares, a negative correlation was found between the HXR source area in the corona and HXR flux. For the SOL2013-05-13T15:51 event, an increasing trend in the time delay spectra at the footpoints was obtained. For both events, the spectra of the time delays in the coronal HXR source showed a decreasing trend with energy in certain flare phases. To interpret the observed phenomena, we considered a flare model of collapsing traps and calculated the distribution functions of accelerated electrons along the magnetic loop using a nonstationary relativistic kinetic equation. This approach considers betatron and Fermi first-order acceleration mechanisms. The increasing trend of the time delay spectra at the footpoints was explained by the high mirror ratio in the magnetic loop and betatron acceleration mechanism. The observed features in the spatial and temporal behavior of the HXR sources, such as the negative correlation between the HXR source area and HXR flux, can be interpreted by the collapsing trap model.https://doi.org/10.3847/1538-4357/acea5eActive solar coronaSolar flaresSolar activitySolar active regionsSolar active region magnetic fieldsSolar energetic particles |
| spellingShingle | Alexander N. Shabalin Evgeniia P. Ovchinnikova Yuri E. Charikov Temporal and Spatial Characteristics of Hard X-Ray Sources in a Flare Model with a Vertical Current Sheet The Astrophysical Journal Active solar corona Solar flares Solar activity Solar active regions Solar active region magnetic fields Solar energetic particles |
| title | Temporal and Spatial Characteristics of Hard X-Ray Sources in a Flare Model with a Vertical Current Sheet |
| title_full | Temporal and Spatial Characteristics of Hard X-Ray Sources in a Flare Model with a Vertical Current Sheet |
| title_fullStr | Temporal and Spatial Characteristics of Hard X-Ray Sources in a Flare Model with a Vertical Current Sheet |
| title_full_unstemmed | Temporal and Spatial Characteristics of Hard X-Ray Sources in a Flare Model with a Vertical Current Sheet |
| title_short | Temporal and Spatial Characteristics of Hard X-Ray Sources in a Flare Model with a Vertical Current Sheet |
| title_sort | temporal and spatial characteristics of hard x ray sources in a flare model with a vertical current sheet |
| topic | Active solar corona Solar flares Solar activity Solar active regions Solar active region magnetic fields Solar energetic particles |
| url | https://doi.org/10.3847/1538-4357/acea5e |
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