MORPHOLOGY OF AVERAGE SOLAR FLARES TIME PROFILES IN MICROWAVE RANGES IN MICROWAVE RANGE
Авторы:
1.
Institute of Solar-Terrestrial Physics of Siberian Branch of Russian Academy of Sciences
2.
Institute of Solar-Terrestrial Physics of Siberian Branch of Russian Academy of Sciences
Тип:
Статья конференции
Опубликовано:
27.12.2024
Классификаторы:
УДК 523.985.3 Вспышки
УДК 52 Астрономия. Геодезия
УДК 53 Физика
УДК 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
УДК 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
УДК 523 Солнечная система
УДК 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
УДК 52-1 Метод изучения
УДК 52-6 Излучение и связанные с ним процессы
ГРНТИ 41.00 АСТРОНОМИЯ
ГРНТИ 29.35 Радиофизика. Физические основы электроники
ГРНТИ 29.31 Оптика
ГРНТИ 29.33 Лазерная физика
ГРНТИ 29.27 Физика плазмы
ГРНТИ 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
ОКСО 03.06.01 Физика и астрономия
ОКСО 03.05.01 Астрономия
ОКСО 03.04.03 Радиофизика
ББК 2 ЕСТЕСТВЕННЫЕ НАУКИ
ББК 223 Физика
ТБК 614 Астрономия
ТБК 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
УДК 52 Астрономия. Геодезия
УДК 53 Физика
УДК 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
УДК 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
УДК 523 Солнечная система
УДК 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
УДК 52-1 Метод изучения
УДК 52-6 Излучение и связанные с ним процессы
ГРНТИ 41.00 АСТРОНОМИЯ
ГРНТИ 29.35 Радиофизика. Физические основы электроники
ГРНТИ 29.31 Оптика
ГРНТИ 29.33 Лазерная физика
ГРНТИ 29.27 Физика плазмы
ГРНТИ 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
ОКСО 03.06.01 Физика и астрономия
ОКСО 03.05.01 Астрономия
ОКСО 03.04.03 Радиофизика
ББК 2 ЕСТЕСТВЕННЫЕ НАУКИ
ББК 223 Физика
ТБК 614 Астрономия
ТБК 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
Язык материала:
английский
Ключевые слова:
Sun: flares; decay phase; microwave emission; average profile
Аннотация (русский):
Average flare time profiles are useful tools for determining energy evolution mechanisms both in the Sun and in stars. The study related to their construction and analysis was done in the visible and ultraviolet spectral ranges. Microwave emission, which is sensitive to various emission mechanisms, was not included in such studies. In this paper, we present the first results of reconstruction and analysis of average time profiles of solar flares using observations with the Siberian Radioheliograph. The events under consideration are flares with simple temporal behavior (without multiple bursts), but emitted in a wide frequency range. The latter feature was necessary to separate the emission of optically thick and optically thin sources. In total, we used 116 events detected during five months of observation in 2023 for the reconstruction. Each profile was normalized to its maximum value and the time scale was transformed into a universal length for all events, by deriving seconds into units equal to half the width of 50 % of the maximum value for each event ($t_{\frac{1}{2}}$). The time profiles of optically thin and optically thick emission sources demonstrate similar behaviour. The pulse phase fits well to a fourth-order polynomial function. The decay phase is fitted by two exponential functions. The emission dominance, fitted by one exponent over another, changes at $t_{\frac{1}{2}}$, which is approximately equal to 1.5.
Average flare time profiles are useful tools for determining energy evolution mechanisms both in the Sun and in stars. The study related to their construction and analysis was done in the visible and ultraviolet spectral ranges. Microwave emission, which is sensitive to various emission mechanisms, was not included in such studies. In this paper, we present the first results of reconstruction and analysis of average time profiles of solar flares using observations with the Siberian Radioheliograph. The events under consideration are flares with simple temporal behavior (without multiple bursts), but emitted in a wide frequency range. The latter feature was necessary to separate the emission of optically thick and optically thin sources. In total, we used 116 events detected during five months of observation in 2023 for the reconstruction. Each profile was normalized to its maximum value and the time scale was transformed into a universal length for all events, by deriving seconds into units equal to half the width of 50 % of the maximum value for each event ($t_{\frac{1}{2}}$). The time profiles of optically thin and optically thick emission sources demonstrate similar behaviour. The pulse phase fits well to a fourth-order polynomial function. The decay phase is fitted by two exponential functions. The emission dominance, fitted by one exponent over another, changes at $t_{\frac{1}{2}}$, which is approximately equal to 1.5.
Ключевые слова:
Sun: flares; decay phase; microwave emission; average profile
Sun: flares; decay phase; microwave emission; average profile
1. Davenport J.R.A., Hawley S.L., Hebb L., et al., 2014, Astrophysical Journal, 797, 2, id. 122
2. Dulk G.A., 1985, Annual Review of Astronomy and Astrophysics, 23, p. 169
3. Kashapova L.K., Broomhall A.M., Larionova A.I., et al., 2021, Monthly Notices of the Royal Astronomical Society, 502, 3, p. 3922
4. Lesovoi S.V. and Kobets V.S., 2017, Solar-Terrestrial Physics, 3, 1, p. 19
5. Rozhkova D.V., Kashapova L.K., Gubin A.V., 2024, Modern Astronomy: from the early Universe to Exsoplanets and Black Holes, Proc. All-Russian Astron. Conf., this Issue
