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Title: ANATOMY OF DEPLETED INTERPLANETARY CORONAL MASS EJECTIONS

Abstract

We report a subset of interplanetary coronal mass ejections (ICMEs) containing distinct periods of anomalous heavy-ion charge state composition and peculiar ion thermal properties measured by ACE /SWICS from 1998 to 2011. We label them “depleted ICMEs,” identified by the presence of intervals where C{sup 6+}/C{sup 5+} and O{sup 7+}/O{sup 6+} depart from the direct correlation expected after their freeze-in heights. These anomalous intervals within the depleted ICMEs are referred to as “Depletion Regions.” We find that a depleted ICME would be indistinguishable from all other ICMEs in the absence of the Depletion Region, which has the defining property of significantly low abundances of fully charged species of helium, carbon, oxygen, and nitrogen. Similar anomalies in the slow solar wind were discussed by Zhao et al. We explore two possibilities for the source of the Depletion Region associated with magnetic reconnection in the tail of a CME, using CME simulations of the evolution of two Earth-bound CMEs described by Manchester et al.

Authors:
; ; ; ;  [1]
  1. Department of Climate and Space Sciences and Engineering, University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109-2143 (United States)
Publication Date:
OSTI Identifier:
22661357
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 834; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON; CARBON IONS; CHARGE STATES; CORRELATIONS; HELIOSPHERE; HELIUM; MAGNETIC RECONNECTION; MASS; MULTICHARGED IONS; NITROGEN; OXYGEN; OXYGEN IONS; SOLAR CORONA; SOLAR WIND; SUN; THERMODYNAMIC PROPERTIES

Citation Formats

Kocher, M., Lepri, S. T., Landi, E., Zhao, L., and Manchester, W. B. IV, E-mail: mkocher@umich.edu. ANATOMY OF DEPLETED INTERPLANETARY CORONAL MASS EJECTIONS. United States: N. p., 2017. Web. doi:10.3847/1538-4357/834/2/147.
Kocher, M., Lepri, S. T., Landi, E., Zhao, L., & Manchester, W. B. IV, E-mail: mkocher@umich.edu. ANATOMY OF DEPLETED INTERPLANETARY CORONAL MASS EJECTIONS. United States. doi:10.3847/1538-4357/834/2/147.
Kocher, M., Lepri, S. T., Landi, E., Zhao, L., and Manchester, W. B. IV, E-mail: mkocher@umich.edu. Tue . "ANATOMY OF DEPLETED INTERPLANETARY CORONAL MASS EJECTIONS". United States. doi:10.3847/1538-4357/834/2/147.
@article{osti_22661357,
title = {ANATOMY OF DEPLETED INTERPLANETARY CORONAL MASS EJECTIONS},
author = {Kocher, M. and Lepri, S. T. and Landi, E. and Zhao, L. and Manchester, W. B. IV, E-mail: mkocher@umich.edu},
abstractNote = {We report a subset of interplanetary coronal mass ejections (ICMEs) containing distinct periods of anomalous heavy-ion charge state composition and peculiar ion thermal properties measured by ACE /SWICS from 1998 to 2011. We label them “depleted ICMEs,” identified by the presence of intervals where C{sup 6+}/C{sup 5+} and O{sup 7+}/O{sup 6+} depart from the direct correlation expected after their freeze-in heights. These anomalous intervals within the depleted ICMEs are referred to as “Depletion Regions.” We find that a depleted ICME would be indistinguishable from all other ICMEs in the absence of the Depletion Region, which has the defining property of significantly low abundances of fully charged species of helium, carbon, oxygen, and nitrogen. Similar anomalies in the slow solar wind were discussed by Zhao et al. We explore two possibilities for the source of the Depletion Region associated with magnetic reconnection in the tail of a CME, using CME simulations of the evolution of two Earth-bound CMEs described by Manchester et al.},
doi = {10.3847/1538-4357/834/2/147},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 834,
place = {United States},
year = {2017},
month = {1}
}