A prolonged He+ enhancement within a coronal mass ejection in the solar wind

R. M. Skoug; S. J. Bame; W. C. Feldman; J. T. Gosling; D. J. McComas; J. T. Steinberg; R. L. Tokar; P. Riley; L. F. Burlaga; N. F. Ness; C. W. Smith

doi:10.1029/1998GL900207

A prolonged He⁺ enhancement within a coronal mass ejection in the solar wind

R. M. Skoug, S. J. Bame, W. C. Feldman, J. T. Gosling, D. J. McComas, J. T. Steinberg, R. L. Tokar, P. Riley, L. F. Burlaga, N. F. Ness, C. W. Smith

Astrophysical Sciences

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Abstract

A coronal mass ejection and magnetic cloud containing an unusually large enhancement of He⁺ was observed in the solar wind by the plasma and magnetic field instruments on the Advanced Composition Explorer (ACE) spacecraft on May 2-4, 1998. The He⁺/He⁺⁺ ratio during this event exceeded 0.5% for a period of more than 24 hours, and reached values as high as 100%. The high He⁺/He⁺⁺ ratio indicates the presence of prominence material, and in fact a disappearing filament and prominence were observed at the Sun in association with this event. The prolonged observation of He⁺ indicates that prominence material extended through much of this CME, the first such observation in a CME in the solar wind.

Original language	English (US)
Pages (from-to)	161-164
Number of pages	4
Journal	Geophysical Research Letters
Volume	26
Issue number	2
DOIs	https://doi.org/10.1029/1998GL900207
State	Published - Jan 15 1999

All Science Journal Classification (ASJC) codes

Geophysics
Earth and Planetary Sciences(all)

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10.1029/1998GL900207

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title = "A prolonged He+ enhancement within a coronal mass ejection in the solar wind",

abstract = "A coronal mass ejection and magnetic cloud containing an unusually large enhancement of He+ was observed in the solar wind by the plasma and magnetic field instruments on the Advanced Composition Explorer (ACE) spacecraft on May 2-4, 1998. The He+/He++ ratio during this event exceeded 0.5% for a period of more than 24 hours, and reached values as high as 100%. The high He+/He++ ratio indicates the presence of prominence material, and in fact a disappearing filament and prominence were observed at the Sun in association with this event. The prolonged observation of He+ indicates that prominence material extended through much of this CME, the first such observation in a CME in the solar wind.",

author = "Skoug, {R. M.} and Bame, {S. J.} and Feldman, {W. C.} and Gosling, {J. T.} and McComas, {D. J.} and Steinberg, {J. T.} and Tokar, {R. L.} and P. Riley and Burlaga, {L. F.} and Ness, {N. F.} and Smith, {C. W.}",

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AU - Skoug, R. M.

AU - Bame, S. J.

AU - Feldman, W. C.

AU - Gosling, J. T.

AU - McComas, D. J.

AU - Steinberg, J. T.

AU - Tokar, R. L.

AU - Riley, P.

AU - Burlaga, L. F.

AU - Ness, N. F.

AU - Smith, C. W.

PY - 1999/1/15

Y1 - 1999/1/15

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AB - A coronal mass ejection and magnetic cloud containing an unusually large enhancement of He+ was observed in the solar wind by the plasma and magnetic field instruments on the Advanced Composition Explorer (ACE) spacecraft on May 2-4, 1998. The He+/He++ ratio during this event exceeded 0.5% for a period of more than 24 hours, and reached values as high as 100%. The high He+/He++ ratio indicates the presence of prominence material, and in fact a disappearing filament and prominence were observed at the Sun in association with this event. The prolonged observation of He+ indicates that prominence material extended through much of this CME, the first such observation in a CME in the solar wind.

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A prolonged He⁺ enhancement within a coronal mass ejection in the solar wind

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