MMS Observations of Electrostatic Waves in an Oblique Shock Crossing

High-resolution particle and wave measurements taken during an oblique bow shock crossing by the Magnetospheric Multiscale (MMS) mission are analyzed. Two regions of differing magnetic behavior are identified within the shock, one with active magnetic fluctuations and one with laminar interplanetary...

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Bibliographic Details
Published in:Journal of geophysical research. Space physics 2018-11, Vol.123 (11), p.9430-9442
Main Authors: Goodrich, Katherine A., Ergun, Robert, Schwartz, Steven J., Wilson, Lynn B., III, Newman, David, Wilder, Frederick D., Holmes, Justin, Johlander, Andreas, Burch, James, Torbert, Roy, Khotyaintsev, Yuri, Lindqvist, Per-Arne, Strangeway, Robert, Russell, Christopher, Gershman, Daniel, Giles, Barbara, Andersson, Laila
Format: Article
Language:English
Subjects:
Acoustic waves
Bernstein waves
Charged particles
Deceleration
Electron heating
Electrostatic waves
Interplanetary magnetic field
Ion acoustic waves
Magnetic fields
Magnetic properties
Magnetic variations
Magnetospheres
Multiscale analysis
Solar magnetic field
Solar Physics
Solar wind
Solitary waves
Topology
Wave measurement
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Summary:High-resolution particle and wave measurements taken during an oblique bow shock crossing by the Magnetospheric Multiscale (MMS) mission are analyzed. Two regions of differing magnetic behavior are identified within the shock, one with active magnetic fluctuations and one with laminar interplanetary magnetic field topology. A prominent reflected ion population is observed in both regions. The active magnetic region is characterized by large-amplitude (>100 mV/m) electrostatic solitary waves, electron Bernstein waves, and ion acoustic waves, along with intermittent current activity and localized electron heating. In the region of laminar magnetic field, ion acoustic waves are prominently observed. Solar wind ion deceleration is observed in both regions of active and laminar magnetic field. All observations suggest that solar wind deceleration can occur as a result of multiple independent processes, in this case current and ion-ion instabilities.
ISSN:2169-9380
2169-9402
2169-9402
DOI:10.1029/2018ja025830