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Exploring the Relation Between Magnetic Fields, Starspots, and CMEs

Published online by Cambridge University Press:  23 December 2024

Fabian Menezes Open the ORCID record for Fabian Menezes [Opens in a new window] ,
Adriana Valio ,
Yuri Netto ,
Alexandre Araújo ,
Christina Kay  and
Merav Opher
Fabian Menezes*
Affiliation:
Universidade Presbiteriana Mackenzie, Centro de Rádio Astronomia e Astrofísica Mackenzie (CRAAM), São Paulo, Brazil
Adriana Valio
Affiliation:
Universidade de São Paulo, Instituto de Astronomia, Geofsica e Ciências Atmosféricas (IAG), Departamento de Astronomia, São Paulo, Brazil
Yuri Netto
Affiliation:
Universidade Presbiteriana Mackenzie, Centro de Rádio Astronomia e Astrofísica Mackenzie (CRAAM), São Paulo, Brazil
Alexandre Araújo
Affiliation:
Universidade Presbiteriana Mackenzie, Centro de Rádio Astronomia e Astrofísica Mackenzie (CRAAM), São Paulo, Brazil
Christina Kay
Affiliation:
NASA Goddard Space Flight Center, Heliophysics Science Division, Greenbelt, USA
Merav Opher
Affiliation:
Boston University, Department of Astronomy, Boston, USA
*
email: [email protected]
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Abstract

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Solar-type stars, including the Sun, have magnetic fields that extend from their interiors to the surface and beyond, influencing both the stellar activity and interplanetary medium. Magnetic activity phenomena, such as coronal mass ejections (CMEs), significantly impacts space weather. These CMEs, composed of plasma clouds with magnetic fields ejected from the stellar corona, pose a potential threat to planets by affecting their magnetosphere and atmosphere. Despite advancements in detecting stellar CMEs, detection remains limited. We focus on understanding CME propagation by analyzing key parameters like position, velocities, and the configuration of stellar magnetic fields. Using spot transit mapping, we reconstruct magnetograms for Kepler-63 and Kepler-411, employing the ForeCAT model to simulate CME trajectories from these stars. Results indicate that CME deflections generally decrease with radial velocity and increase with ejection latitude. Additionally, stars with stronger magnetic fields, such as Kepler-63, tend to cause more significant CME deflections.

Keywords

Solar-type starsStarspotsStellar magnetic fieldcoronal mass ejections (CMEs)
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S365: Dynamics of Solar and Stellar Convection Zones and Atmospheres , December 2023 , pp. 426 - 435
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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