Journal article
Plasma waves observed during cusp energetic particle events and their correlation with Polar and akebono satellite and ground data
Advances in space research, Vol.24(1), pp.23-33
1999
DOI: 10.1016/S0273-1177(99)00418-4
Abstract
We present Polar plasma wave data during cusp energetic particle (CEP) events at 6–9 R
E. These data suggest the presence of coherent electrostatic structures that are highly localized and that have typical velocities on the order of hundreds to thousands of km/s along the ambient magnetic field. Some of the wave signatures are solitary waves and some are wave packets. The Polar wave instrument also provides evidence that some of the bursts of electromagnetic waves (with frequencies of a few hundred Hz and just below the electron cyclotron frequency around 800 Hz to 1–2 kHz) that are observed are cohenrent and propagating both up and down the field lines. Electron cyclotron harmonic (ECH) waves are oftern detected but their duration is usually short (< 1 s). Low Frequency (<1 kHz), broadband, bursty electromagnetic waves are also present. The Polar wave data results are used to obtain a better understanding of the macro/microphysics during a CEP event that takes place on September 11, 1996, by correlating various Polar (∼ 7.0 R
E) and Akebono (∼ 1.4 R
E) data while both spacecraft are in or near the cusp/cleft region and nearly on the same field line, and magnetometer data from the Canadian Intermagnet and Canopus ground stations, which lie near the base of the magnetic pootprint passing through Polar. Solar wind and magnetic field data from the interplanetary medium and magnetosheath are provided by the Geotail and IMP-8 satellites, respectively. Some of the cusp waves may be indicators of the reconnection process taking place through the cusp, the result of mixing of magnetosheath with magnetospheric plasma, and the consequence of an anisotropic electron population in a depressed magnetic field. The low frequency electromagnetic waves are still under study to determine their role, if any, in the heating and acceleration of the MeV He ions during CEP events.
Details
- Title: Subtitle
- Plasma waves observed during cusp energetic particle events and their correlation with Polar and akebono satellite and ground data
- Creators
- J.S Pickett - University of IowaD.A Gurnett - University of IowaJ.D Menietti - University of IowaM.J LeDocq - University of IowaJ.D Scudder - University of IowaL.A Frank - University of IowaJ.B Sigwarth - University of IowaK.L Ackerson - University of IowaD.D Morgan - University of IowaJ.R Franz - Cornell UniversityP.M Kintner - Cornell UniversityB.T Tsurutani - Jet Propulsion LaboratoryC.M Ho - Jet Propulsion LaboratoryJ Chen - Boston UniversityT.A Fritz - Boston UniversityC.T Russell - University of California, Los AngelesW.K Peterson - Lockheed Martin Palo Alto Research Laboratory, 3251 Hanover St., Palo Alto, CA 94304 USAY Kasahara - Kyoto UniversityI Kimura - Osaka Institute of TechnologyS Watanabe - Tohoku UniversityG.G Arkos - University of CalgaryG Rostoker - University of AlbertaS Kokubun - Nagoya UniversityH Fukunishi - Osaka Institute of TechnologyR.F Pfaff - Goddard Space Flight CenterF.S Mozer - University of California, BerkeleyS.-Y Hsieh - Goddard Space Flight CenterT Mukai - Institute of Space and Astronautical ScienceM.O Chandler - Marshall Space Flight Center
- Resource Type
- Journal article
- Publication Details
- Advances in space research, Vol.24(1), pp.23-33
- DOI
- 10.1016/S0273-1177(99)00418-4
- ISSN
- 0273-1177
- eISSN
- 1879-1948
- Publisher
- Elsevier Ltd
- Language
- English
- Date published
- 1999
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199703102771
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