Solar Cycle Variation of Axial Orientations and Favorable Locations of Eruptive MFRs
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913637730353152 |
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| author | Xie, Hong Gopalswamy, Nat Akiyama, Sachiko Makela, Pertti Yashiro, Seiji |
| author_facet | Xie, Hong Gopalswamy, Nat Akiyama, Sachiko Makela, Pertti Yashiro, Seiji |
| contents | Using multi-viewpoint observations from STEREO and SOHO during three solar cycles from 23 to 25, we study the magnetic flux rope (MFR) structures of coronal mass ejections (CMEs) near the Sun and magnetic clouds (MCs) at 1au. The study aims to investigate two phenomena: 1) the occurrence rate of CMEs near Hale sector boundaries (HBs) and 2) solar-cycle variation of MFR axial orientations in CMEs and MCs. Our preliminary results include: 1) the axes of MFRs in cycle 25 present a systematic northward orientation, which is the same as in cycle 23 but opposite to cycle 24; 2) the majority of the MFRs occurred near HBs (within 30 degrees) and some exceptional events occurred at non-HBs; 3) the axial fields in MCs present a similar north-south orientation, which changes from cycle to cycle. We discuss the implication of solar cycle variations of MFR axial orientations for space weather forecasts. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_03346 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Solar Cycle Variation of Axial Orientations and Favorable Locations of Eruptive MFRs Xie, Hong Gopalswamy, Nat Akiyama, Sachiko Makela, Pertti Yashiro, Seiji Solar and Stellar Astrophysics Using multi-viewpoint observations from STEREO and SOHO during three solar cycles from 23 to 25, we study the magnetic flux rope (MFR) structures of coronal mass ejections (CMEs) near the Sun and magnetic clouds (MCs) at 1au. The study aims to investigate two phenomena: 1) the occurrence rate of CMEs near Hale sector boundaries (HBs) and 2) solar-cycle variation of MFR axial orientations in CMEs and MCs. Our preliminary results include: 1) the axes of MFRs in cycle 25 present a systematic northward orientation, which is the same as in cycle 23 but opposite to cycle 24; 2) the majority of the MFRs occurred near HBs (within 30 degrees) and some exceptional events occurred at non-HBs; 3) the axial fields in MCs present a similar north-south orientation, which changes from cycle to cycle. We discuss the implication of solar cycle variations of MFR axial orientations for space weather forecasts. |
| title | Solar Cycle Variation of Axial Orientations and Favorable Locations of Eruptive MFRs |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2501.03346 |