FAST satellite wave observations in the AKR source region

R. E. Ergun; C. W. Carlson; J. P. McFadden; F. S. Mozer; G. T. Delory; W. Peria; C. C. Chaston; M. Temerin; R. Elphic; R. Strangeway; R. Pfaff; Cynthia A Cattell; D. Klumpar; E. Shelly; W. Peterson; E. Moebius; L. Kistler

doi:10.1029/98GL00570

FAST satellite wave observations in the AKR source region

R. E. Ergun, C. W. Carlson, J. P. McFadden, F. S. Mozer, G. T. Delory, W. Peria, C. C. Chaston, M. Temerin, R. Elphic, R. Strangeway, R. Pfaff, Cynthia A Cattell, D. Klumpar, E. Shelly, W. Peterson, E. Moebius, L. Kistler

Physics and Astronomy (Twin Cities)

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183 Scopus citations

Abstract

The Fast Auroral SnapshoT (FAST) satellite has made observations in the Auroral Kilometric Radiation (AKR) source region with unprecedented frequency and time resolution. We confirm the AKR source is in a density depleted cavity and present examples in which cold electrons appeared to have been nearly evacuated (n_hot>n_cold). Electron distributions were depleted at low-energies and up-going ion beams were always present. Source region amplitudes were far greater than previously reported, reaching 2×10^-4 (V/m)²/Hz (300 mV/m) in short bursts with bandwidths generally < 1 kHz. Intense emissions were often at the edge of the density cavity. Emissions were near or below the cold plasma electron cyclotron frequency in the source region, and were almost entirely electromagnetic. The |E|/|B| ratio was constant as a function of frequency and rarely displayed any features that would identify a cold plasma cutoff or resonance.

Original language	English (US)
Pages (from-to)	2061-2064
Number of pages	4
Journal	Geophysical Research Letters
Volume	25
Issue number	12
DOIs	https://doi.org/10.1029/98GL00570
State	Published - 1998

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Ergun, R. E., Carlson, C. W., McFadden, J. P., Mozer, F. S., Delory, G. T., Peria, W., Chaston, C. C., Temerin, M., Elphic, R., Strangeway, R., Pfaff, R., Cattell, C. A., Klumpar, D., Shelly, E., Peterson, W., Moebius, E., & Kistler, L. (1998). FAST satellite wave observations in the AKR source region. Geophysical Research Letters, 25(12), 2061-2064. https://doi.org/10.1029/98GL00570

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title = "FAST satellite wave observations in the AKR source region",

abstract = "The Fast Auroral SnapshoT (FAST) satellite has made observations in the Auroral Kilometric Radiation (AKR) source region with unprecedented frequency and time resolution. We confirm the AKR source is in a density depleted cavity and present examples in which cold electrons appeared to have been nearly evacuated (nhot>ncold). Electron distributions were depleted at low-energies and up-going ion beams were always present. Source region amplitudes were far greater than previously reported, reaching 2×10-4 (V/m)2/Hz (300 mV/m) in short bursts with bandwidths generally < 1 kHz. Intense emissions were often at the edge of the density cavity. Emissions were near or below the cold plasma electron cyclotron frequency in the source region, and were almost entirely electromagnetic. The |E|/|B| ratio was constant as a function of frequency and rarely displayed any features that would identify a cold plasma cutoff or resonance.",

author = "Ergun, {R. E.} and Carlson, {C. W.} and McFadden, {J. P.} and Mozer, {F. S.} and Delory, {G. T.} and W. Peria and Chaston, {C. C.} and M. Temerin and R. Elphic and R. Strangeway and R. Pfaff and Cattell, {Cynthia A} and D. Klumpar and E. Shelly and W. Peterson and E. Moebius and L. Kistler",

year = "1998",

doi = "10.1029/98GL00570",

language = "English (US)",

volume = "25",

pages = "2061--2064",

journal = "Geophysical Research Letters",

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T1 - FAST satellite wave observations in the AKR source region

AU - Ergun, R. E.

AU - Carlson, C. W.

AU - McFadden, J. P.

AU - Mozer, F. S.

AU - Delory, G. T.

AU - Peria, W.

AU - Chaston, C. C.

AU - Temerin, M.

AU - Elphic, R.

AU - Strangeway, R.

AU - Pfaff, R.

AU - Cattell, Cynthia A

AU - Klumpar, D.

AU - Shelly, E.

AU - Peterson, W.

AU - Moebius, E.

AU - Kistler, L.

PY - 1998

Y1 - 1998

N2 - The Fast Auroral SnapshoT (FAST) satellite has made observations in the Auroral Kilometric Radiation (AKR) source region with unprecedented frequency and time resolution. We confirm the AKR source is in a density depleted cavity and present examples in which cold electrons appeared to have been nearly evacuated (nhot>ncold). Electron distributions were depleted at low-energies and up-going ion beams were always present. Source region amplitudes were far greater than previously reported, reaching 2×10-4 (V/m)2/Hz (300 mV/m) in short bursts with bandwidths generally < 1 kHz. Intense emissions were often at the edge of the density cavity. Emissions were near or below the cold plasma electron cyclotron frequency in the source region, and were almost entirely electromagnetic. The |E|/|B| ratio was constant as a function of frequency and rarely displayed any features that would identify a cold plasma cutoff or resonance.

AB - The Fast Auroral SnapshoT (FAST) satellite has made observations in the Auroral Kilometric Radiation (AKR) source region with unprecedented frequency and time resolution. We confirm the AKR source is in a density depleted cavity and present examples in which cold electrons appeared to have been nearly evacuated (nhot>ncold). Electron distributions were depleted at low-energies and up-going ion beams were always present. Source region amplitudes were far greater than previously reported, reaching 2×10-4 (V/m)2/Hz (300 mV/m) in short bursts with bandwidths generally < 1 kHz. Intense emissions were often at the edge of the density cavity. Emissions were near or below the cold plasma electron cyclotron frequency in the source region, and were almost entirely electromagnetic. The |E|/|B| ratio was constant as a function of frequency and rarely displayed any features that would identify a cold plasma cutoff or resonance.

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DO - 10.1029/98GL00570

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SP - 2061

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JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 12

ER -

FAST satellite wave observations in the AKR source region

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