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Charge-equilibration of Fe ions accelerated in a hot plasma

Kovaltsov, G. A. and Barghouty, A. F. and Kocharov, L. and Ostryakov, V. M. and Torsti, J. (2001) Charge-equilibration of Fe ions accelerated in a hot plasma. Astronomy & Astrophysics, 375 (3). pp. 1075-1081. ISSN 0004-6361. https://resolver.caltech.edu/CaltechAUTHORS:20180307-073107509

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Abstract

We examine the energy-dependent rates of charge-changing processes of energetic Fe ions in the hot plasma of the solar corona. For ionization of the Fe-ion projectile in collisions with ambient protons, three different methods of estimating the corresponding ionization cross sections are presented and compared. Proton-impact ionization is found to be significant irrespective of the particular method used. Differences in the proton-impact ionization cross sections' estimates are shown to have little effect in calculating highly nonequilibrium Fe charge states during acceleration, whereas equilibrium charge states are sensitive to such differences. A parametric study of the Fe charge-equilibration comprises (i) impact of the ambient plasma density, and (ii) the energy dependence impact of the acceleration rate upon the charge-energy profiles and upon the estimated values of the density x acceleration-time product. We emphasize potential importance of careful measurements of charge-energy profiles along with ion energy spectra for determining the energy dependence of ion acceleration time and the energy dependence of the leaky-box escape time.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1051/0004-6361:20010877DOIArticle
https://www.aanda.org/articles/aa/abs/2001/33/aah2786/aah2786.htmlPublisherArticle
Additional Information:© 2001 ESO. Article published by EDP Sciences. Received 6 April 2001; Accepted 15 June 2001; Published online 15 September 2001. We thank the Academy of Finland for the financial support. G. K. was supported by the Russian Basic Research Foundation under the grant RFFI-00-02-17031. A. F. B.'s work is supported by the US National Science Foundation grant No. 9810653, and by NASA-JOVE grant No. NAG8-1208 and Nos. NAS5-30704 and NAG5-6912 at Caltech.
Funders:
Funding AgencyGrant Number
Academy of FinlandUNSPECIFIED
Russian Foundation for Basic ResearchRFFI-00-02-17031
NSFAGS-9810653
NASANAG8-1208
NASANAS5-30704
NASANAG5-6912
Subject Keywords:acceleration of particles - atomic processes - Sun: particle emission
Issue or Number:3
Record Number:CaltechAUTHORS:20180307-073107509
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180307-073107509
Official Citation:Charge-equilibration of Fe ions accelerated in a hot plasma. G. A. Kovaltsov, A. F. Barghouty, L. Kocharov, V. M. Ostryakov and J. Torsti. A&A, 375 3 (2001) 1075-1081. DOI: https://doi.org/10.1051/0004-6361:20010877
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85155
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Mar 2018 17:49
Last Modified:03 Oct 2019 19:27

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