Observation of Six Pre-Flare VLP Pulsations in Solar Corona
Solar flares are sudden bursts in the solar atmosphere, which emit from radio wavelengths to gamma rays, and according to their energy, are classified into different classes (A, B, C, M, and X, respectively). Predicting the time of the flare occurrence and determining its class type can help reduce...
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Damghan university
2023-11-01
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| Series: | Iranian Journal of Astronomy and Astrophysics |
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| Online Access: | https://ijaa.du.ac.ir/article_367_5d3775947e3b50392c789d50c2251261.pdf |
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| author | Malihe Jalalirad Narges Fathalian |
| author_facet | Malihe Jalalirad Narges Fathalian |
| author_sort | Malihe Jalalirad |
| collection | DOAJ |
| description | Solar flares are sudden bursts in the solar atmosphere, which emit from radio wavelengths to gamma rays, and according to their energy, are classified into different classes (A, B, C, M, and X, respectively). Predicting the time of the flare occurrence and determining its class type can help reduce its destructive effects. One of the observable structures that can be seen before a flare occurs are oscillations with very long period pulsations (VLPs) of the order of 8-30 minutes, which occur about one to two hours before the flare onset. In this paper, using GOES data, we observed typical VLPs before flare-onset for six flares in Class C and M. Periodicities that we calculated for the VLPs of these flares are between 14.6 and 28.2 minutes, which is in agreement with the results of Tan et al. (2016). The number of pulses observed in each pre-flare is between 4 and 6. For the other two remaining flares of our selection, no typical pre-flare VLP was observed. |
| format | Article |
| id | doaj-art-2d9878a1ecba45df94625b5749866d0c |
| institution | Kabale University |
| issn | 2322-4924 2383-403X |
| language | English |
| publishDate | 2023-11-01 |
| publisher | Damghan university |
| record_format | Article |
| series | Iranian Journal of Astronomy and Astrophysics |
| spelling | doaj-art-2d9878a1ecba45df94625b5749866d0c2025-01-12T10:07:14ZengDamghan universityIranian Journal of Astronomy and Astrophysics2322-49242383-403X2023-11-0110220122010.22128/ijaa.2023.720.1163367Observation of Six Pre-Flare VLP Pulsations in Solar CoronaMalihe Jalalirad0Narges Fathalian1Department of Physics, Payame Noor University, Tehran, Iran.Department of Physics, Payame Noor University, P.O.Box 19395-3697, Tehran, Iran.Solar flares are sudden bursts in the solar atmosphere, which emit from radio wavelengths to gamma rays, and according to their energy, are classified into different classes (A, B, C, M, and X, respectively). Predicting the time of the flare occurrence and determining its class type can help reduce its destructive effects. One of the observable structures that can be seen before a flare occurs are oscillations with very long period pulsations (VLPs) of the order of 8-30 minutes, which occur about one to two hours before the flare onset. In this paper, using GOES data, we observed typical VLPs before flare-onset for six flares in Class C and M. Periodicities that we calculated for the VLPs of these flares are between 14.6 and 28.2 minutes, which is in agreement with the results of Tan et al. (2016). The number of pulses observed in each pre-flare is between 4 and 6. For the other two remaining flares of our selection, no typical pre-flare VLP was observed.https://ijaa.du.ac.ir/article_367_5d3775947e3b50392c789d50c2251261.pdfsolar coronasolar flarepre-flare very long-period (vlp) pulsationsflare forecast |
| spellingShingle | Malihe Jalalirad Narges Fathalian Observation of Six Pre-Flare VLP Pulsations in Solar Corona Iranian Journal of Astronomy and Astrophysics solar corona solar flare pre-flare very long-period (vlp) pulsations flare forecast |
| title | Observation of Six Pre-Flare VLP Pulsations in Solar Corona |
| title_full | Observation of Six Pre-Flare VLP Pulsations in Solar Corona |
| title_fullStr | Observation of Six Pre-Flare VLP Pulsations in Solar Corona |
| title_full_unstemmed | Observation of Six Pre-Flare VLP Pulsations in Solar Corona |
| title_short | Observation of Six Pre-Flare VLP Pulsations in Solar Corona |
| title_sort | observation of six pre flare vlp pulsations in solar corona |
| topic | solar corona solar flare pre-flare very long-period (vlp) pulsations flare forecast |
| url | https://ijaa.du.ac.ir/article_367_5d3775947e3b50392c789d50c2251261.pdf |
| work_keys_str_mv | AT malihejalalirad observationofsixpreflarevlppulsationsinsolarcorona AT nargesfathalian observationofsixpreflarevlppulsationsinsolarcorona |