Bright ultraviolet knots as possible sources of coherent microwave radiation
A distinctive feature of the September 6, 2012 event was that sources of narrow-band (2–4 GHz) sub-second pulses (SSP) were observed in small areas of flare loops with so-called bright ultraviolet knots with high plasma density up to 1011 10¹¹ cm⁻³. Time profiles of hard X-rays of the flare, althoug...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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INFRA-M
2023-12-01
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| Series: | Solar-Terrestrial Physics |
| Subjects: | |
| Online Access: | https://naukaru.ru/en/nauka/article/65064/view |
| _version_ | 1827388889998819328 |
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| author | Meshalkina N. S. Altyntsev A. T. |
| author_facet | Meshalkina N. S. Altyntsev A. T. |
| author_sort | Meshalkina N. S. |
| collection | DOAJ |
| description | A distinctive feature of the September 6, 2012 event was that sources of narrow-band (2–4 GHz) sub-second pulses (SSP) were observed in small areas of flare loops with so-called bright ultraviolet knots with high plasma density up to 1011 10¹¹ cm⁻³. Time profiles of hard X-rays of the flare, although similar to microwave light curves, do not have structures corresponding to SSP. Analysis of microwave, X-ray, and ultraviolet data has shown that the observable pulses of microwave radiation with a narrow spectral band are coherent in nature and are generated by electrons with energies of several tens of kiloelectronvolt in bright knots at a double plasma frequency. The results of the observations suggest that the appearance of bright knots is associated with local processes of energy release due to interaction of flare loops. |
| first_indexed | 2024-03-08T16:25:20Z |
| format | Article |
| id | doaj.art-52a13dd507ef491f80d0c9c8b24f2790 |
| institution | Directory Open Access Journal |
| issn | 2500-0535 |
| language | English |
| last_indexed | 2024-03-08T16:25:20Z |
| publishDate | 2023-12-01 |
| publisher | INFRA-M |
| record_format | Article |
| series | Solar-Terrestrial Physics |
| spelling | doaj.art-52a13dd507ef491f80d0c9c8b24f27902024-01-07T07:45:15ZengINFRA-MSolar-Terrestrial Physics2500-05352023-12-0194172410.12737/stp-94202302Bright ultraviolet knots as possible sources of coherent microwave radiationMeshalkina N. S.0Altyntsev A. T.1Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, RussiaInstitute of Solar-Terrestrial Physics SB RAS, Irkutsk, RussiaA distinctive feature of the September 6, 2012 event was that sources of narrow-band (2–4 GHz) sub-second pulses (SSP) were observed in small areas of flare loops with so-called bright ultraviolet knots with high plasma density up to 1011 10¹¹ cm⁻³. Time profiles of hard X-rays of the flare, although similar to microwave light curves, do not have structures corresponding to SSP. Analysis of microwave, X-ray, and ultraviolet data has shown that the observable pulses of microwave radiation with a narrow spectral band are coherent in nature and are generated by electrons with energies of several tens of kiloelectronvolt in bright knots at a double plasma frequency. The results of the observations suggest that the appearance of bright knots is associated with local processes of energy release due to interaction of flare loops.https://naukaru.ru/en/nauka/article/65064/viewsunfine temporal structureuv bright knotsmicrowave burstscoherent emission |
| spellingShingle | Meshalkina N. S. Altyntsev A. T. Bright ultraviolet knots as possible sources of coherent microwave radiation Solar-Terrestrial Physics sun fine temporal structure uv bright knots microwave bursts coherent emission |
| title | Bright ultraviolet knots as possible sources of coherent microwave radiation |
| title_full | Bright ultraviolet knots as possible sources of coherent microwave radiation |
| title_fullStr | Bright ultraviolet knots as possible sources of coherent microwave radiation |
| title_full_unstemmed | Bright ultraviolet knots as possible sources of coherent microwave radiation |
| title_short | Bright ultraviolet knots as possible sources of coherent microwave radiation |
| title_sort | bright ultraviolet knots as possible sources of coherent microwave radiation |
| topic | sun fine temporal structure uv bright knots microwave bursts coherent emission |
| url | https://naukaru.ru/en/nauka/article/65064/view |
| work_keys_str_mv | AT meshalkinans brightultravioletknotsaspossiblesourcesofcoherentmicrowaveradiation AT altyntsevat brightultravioletknotsaspossiblesourcesofcoherentmicrowaveradiation |