Study of Alpha Particle Properties Across Rarefaction Regions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10440085" target="_blank" >RIV/00216208:11320/21:10440085 - isvavai.cz</a>
Result on the web
<a href="https://www.mff.cuni.cz/veda/konference/wds/proc/pdf21/WDS21_04_f2_Durovcova.pdf" target="_blank" >https://www.mff.cuni.cz/veda/konference/wds/proc/pdf21/WDS21_04_f2_Durovcova.pdf</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Study of Alpha Particle Properties Across Rarefaction Regions
Original language description
CRRs are characterized by a monotonic decrease of the solar wind speed and are associated with the regions of a small longitudinal extent on the Sun. Differences between properties of protons and alpha particles (the two most abundant ionic components of the solar wind) are often used to identify the source regions of solar wind streams. However, stream interactions can change alpha-proton relations. In our study, we use near-Earth measurements and focus on the behavior of alpha particles in CRRs. We observed large variations of the alpha particle relative abundance nα/np in these regions which are usually not connected with the solar wind speed and alpha-proton relative drift changes. We perform a superposed epoch analysis of the collected CRRs with a motivation to determine the global profile of alpha particle parameters across CRRs. We find that CRRs exhibit a continuous transition of the alpha particle characteristics from fast to slow streams. For a large part of the CRR, nα/np corresponds to values usually observed in the fast solar wind. We suggest that either a majority of the wind streams in the CRR originate from a coronal hole, or that an additional process altering the alpha parameters occurs in the CRR.
Czech name
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Czech description
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Project
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Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
WDS'21 Proceedings of Contributed Papers — Physics
ISBN
978-80-7378-455-3
ISSN
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e-ISSN
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Number of pages
7
Pages from-to
27-33
Publisher name
Matfyzpress
Place of publication
Praha
Event location
Praha/ZOOM
Event date
Jun 15, 2021
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
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