An unusual coronal mass ejection: First Solar Wind Electron, Proton, Alpha Monitor (SWEPAM) results from the Advanced Composition Explorer

D. J. McComas; S. J. Bame; P. L. Barker; D. M. Delapp; W. C. Feldman; J. T. Gosling; E. Santiago; R. M. Skoug; R. L. Tokar; P. Riley; J. L. Phillips; J. W. Griffee

doi:10.1029/1998GL900174

An unusual coronal mass ejection: First Solar Wind Electron, Proton, Alpha Monitor (SWEPAM) results from the Advanced Composition Explorer

D. J. McComas, S. J. Bame, P. L. Barker, D. M. Delapp, W. C. Feldman, J. T. Gosling, E. Santiago, R. M. Skoug, R. L. Tokar, P. Riley, J. L. Phillips, J. W. Griffee

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21 Scopus citations

Abstract

This paper reports the first scientific results from the Solar Wind Electron Proton Alpha Monitor (SWEPAM) instrument on board the Advanced Composition Explorer (ACE) spacecraft. We analyzed a coronal mass ejection (CME) observed in the solar wind using data from early February, 1998. This event displayed several of the common signatures of CMEs, such as counterstreaming halo electrons and depressed ion and electron temperatures, as well as some unusual features. During a portion of the CME traversal, SWEPAM measured a very large helium to proton abundance ratio. Other heavy ions, with a set of ionization states consistent with normal (1-2 x 10⁶ K) coronal temperatures, were proportionately enhanced at this time. These observations suggest a source for at least some of the CME material, where heavy ions are initially concentrated relative to hydrogen and then accelerated up into the solar wind, independent of their mass and first ionization potential.

Original language	English (US)
Pages (from-to)	4289-4292
Number of pages	4
Journal	Geophysical Research Letters
Volume	25
Issue number	23
DOIs	https://doi.org/10.1029/1998GL900174
State	Published - Dec 1 1999
Externally published	Yes

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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10.1029/1998GL900174

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McComas, D. J., Bame, S. J., Barker, P. L., Delapp, D. M., Feldman, W. C., Gosling, J. T., Santiago, E., Skoug, R. M., Tokar, R. L., Riley, P., Phillips, J. L., & Griffee, J. W. (1999). An unusual coronal mass ejection: First Solar Wind Electron, Proton, Alpha Monitor (SWEPAM) results from the Advanced Composition Explorer. Geophysical Research Letters, 25(23), 4289-4292. https://doi.org/10.1029/1998GL900174

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title = "An unusual coronal mass ejection: First Solar Wind Electron, Proton, Alpha Monitor (SWEPAM) results from the Advanced Composition Explorer",

abstract = "This paper reports the first scientific results from the Solar Wind Electron Proton Alpha Monitor (SWEPAM) instrument on board the Advanced Composition Explorer (ACE) spacecraft. We analyzed a coronal mass ejection (CME) observed in the solar wind using data from early February, 1998. This event displayed several of the common signatures of CMEs, such as counterstreaming halo electrons and depressed ion and electron temperatures, as well as some unusual features. During a portion of the CME traversal, SWEPAM measured a very large helium to proton abundance ratio. Other heavy ions, with a set of ionization states consistent with normal (1-2 x 106 K) coronal temperatures, were proportionately enhanced at this time. These observations suggest a source for at least some of the CME material, where heavy ions are initially concentrated relative to hydrogen and then accelerated up into the solar wind, independent of their mass and first ionization potential.",

author = "McComas, {D. J.} and Bame, {S. J.} and Barker, {P. L.} and Delapp, {D. M.} and Feldman, {W. C.} and Gosling, {J. T.} and E. Santiago and Skoug, {R. M.} and Tokar, {R. L.} and P. Riley and Phillips, {J. L.} and Griffee, {J. W.}",

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McComas, DJ, Bame, SJ, Barker, PL, Delapp, DM, Feldman, WC, Gosling, JT, Santiago, E, Skoug, RM, Tokar, RL, Riley, P, Phillips, JL & Griffee, JW 1999, 'An unusual coronal mass ejection: First Solar Wind Electron, Proton, Alpha Monitor (SWEPAM) results from the Advanced Composition Explorer', Geophysical Research Letters, vol. 25, no. 23, pp. 4289-4292. https://doi.org/10.1029/1998GL900174

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AU - McComas, D. J.

AU - Bame, S. J.

AU - Barker, P. L.

AU - Delapp, D. M.

AU - Feldman, W. C.

AU - Gosling, J. T.

AU - Santiago, E.

AU - Skoug, R. M.

AU - Tokar, R. L.

AU - Riley, P.

AU - Phillips, J. L.

AU - Griffee, J. W.

PY - 1999/12/1

Y1 - 1999/12/1

N2 - This paper reports the first scientific results from the Solar Wind Electron Proton Alpha Monitor (SWEPAM) instrument on board the Advanced Composition Explorer (ACE) spacecraft. We analyzed a coronal mass ejection (CME) observed in the solar wind using data from early February, 1998. This event displayed several of the common signatures of CMEs, such as counterstreaming halo electrons and depressed ion and electron temperatures, as well as some unusual features. During a portion of the CME traversal, SWEPAM measured a very large helium to proton abundance ratio. Other heavy ions, with a set of ionization states consistent with normal (1-2 x 106 K) coronal temperatures, were proportionately enhanced at this time. These observations suggest a source for at least some of the CME material, where heavy ions are initially concentrated relative to hydrogen and then accelerated up into the solar wind, independent of their mass and first ionization potential.

AB - This paper reports the first scientific results from the Solar Wind Electron Proton Alpha Monitor (SWEPAM) instrument on board the Advanced Composition Explorer (ACE) spacecraft. We analyzed a coronal mass ejection (CME) observed in the solar wind using data from early February, 1998. This event displayed several of the common signatures of CMEs, such as counterstreaming halo electrons and depressed ion and electron temperatures, as well as some unusual features. During a portion of the CME traversal, SWEPAM measured a very large helium to proton abundance ratio. Other heavy ions, with a set of ionization states consistent with normal (1-2 x 106 K) coronal temperatures, were proportionately enhanced at this time. These observations suggest a source for at least some of the CME material, where heavy ions are initially concentrated relative to hydrogen and then accelerated up into the solar wind, independent of their mass and first ionization potential.

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An unusual coronal mass ejection: First Solar Wind Electron, Proton, Alpha Monitor (SWEPAM) results from the Advanced Composition Explorer

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