Suprathermal ions in solar-wind outflows from coronal holes at 1 AU
- Authors: Zel’dovich M.A.1, Logachev Y.I.1, Surova G.M.1, Kecskemety K.2, Veselovskii I.S.3
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Affiliations:
- D.V. Skobel’tsin Nuclear Physics Research Institute
- Wigner Research Centre for Physics
- Space Research Institute
- Issue: Vol 60, No 7 (2016)
- Pages: 687-693
- Section: Article
- URL: https://journals.rcsi.science/1063-7729/article/view/189990
- DOI: https://doi.org/10.1134/S1063772916070106
- ID: 189990
Cite item
Abstract
The energy spectra and relative abundances of 3He, 4He, C, O, and Fe ions with energies of ~0.04–2 MeV/nucleon are studied using data from the ULEIS instrument on board the ACE spacecraft obtained during quiescent periods in 2006–2012. During the unique, prolonged minimum between cycles 23 and 24, 35 quiescent periods were distnguished, during which solar-wind flows from near-equatorial coronal holes (CHs) were detected. It is shown that the C/O and Fe/O ratios for suprathermal ions correspond to the relative abundances of the corresponding thermal ions in the fast and slow (Maxwellian) solar wind (SWICS/ACE), while the 4He/O ratio exceeds the corresponding ratio in the solar wind by a factor of two. The intensities of the 3He, 4He, C, O, and Fe suprathermal ions in outflows from CHs grow with the speed of the solar wind. This indicates that, in periods ofminimumsolar activity, suprathermal ions from CHs represent a high-temperature “tail” of the solar wind. An additional flux of suprathermal helium ions may also be contributed by other external sources.
About the authors
M. A. Zel’dovich
D.V. Skobel’tsin Nuclear Physics Research Institute
Author for correspondence.
Email: mariya@srd.sinp.msu.ru
Russian Federation, Moscow
Yu. I. Logachev
D.V. Skobel’tsin Nuclear Physics Research Institute
Email: mariya@srd.sinp.msu.ru
Russian Federation, Moscow
G. M. Surova
D.V. Skobel’tsin Nuclear Physics Research Institute
Email: mariya@srd.sinp.msu.ru
Russian Federation, Moscow
K. Kecskemety
Wigner Research Centre for Physics
Email: mariya@srd.sinp.msu.ru
Hungary, Budapest
I. S. Veselovskii
Space Research Institute
Email: mariya@srd.sinp.msu.ru
Russian Federation, Moscow
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