Hiss or equatorial noise? Ambiguities in analyzing suprathermal ion plasma wave resonance

0472221 - ÚFA 2017 RIV US eng J - Journal Article
Sarno-Smith, L. K. - Liemohn, M. W. - Skoug, R. M. - Santolík, Ondřej - Morley, S. K. - Breneman, A. - Larsen, B. A. - Reeves, G. - Wygant, J. R. - Hospodarsky, G. - Kletzing, C. - Moldwin, M. B. - Katus, R. M. - Zou, S.
Hiss or equatorial noise? Ambiguities in analyzing suprathermal ion plasma wave resonance.
Journal of Geophysical Research-Space Physics. Roč. 121, č. 10 (2016), s. 9619-9631. ISSN 2169-9380. E-ISSN 2169-9402
R&D Projects: GA MŠMT(CZ) LH15304
Grant - others:AV ČR(CZ) AP1401
Program: Akademická prémie - Praemium Academiae
Institutional support: RVO:68378289
Keywords : equatorial noise * low-energy ions * plasma waves * plasmasphere * plasmaspheric hiss
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.733, year: 2016
http://onlinelibrary.wiley.com/doi/10.1002/2016JA022975/abstract

Previous studies have shown that low-energy ion heating occurs in the magnetosphere due to strong equatorial noise emission. Observations from the Van Allen Probes Helium Oxygen Proton Electron (HOPE) instrument recently determined that there was a depletion in the 1–10 eV ion population in the postmidnight sector of Earth during quiet times at L < 3. The diurnal variation of equatorially mirroring 1–10 eV H+ ions at 2 < L < 3 is connected with similar diurnal variation in the electric field component of plasma waves ranging between 150 and 600 Hz. Measurements from the Van Allen Probes Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) data set are used to analyze waves of this frequency in near-Earth space. However, when we examine the polarization of the waves in the 150 to 600 Hz range in the equatorial plane, the majority are right-hand polarized plasmaspheric hiss waves. The 1–10 eV H+ equatorially mirroring population does not interact with right-hand waves, despite a strong statistical relationship suggesting that the two are linked. We present evidence supporting the relationship, both in our own work and the literature, but we ultimately conclude that the 1–10 eV H+ heating is not related to the strong enhancement of 150 to 600 Hz waves.
Permanent Link: http://hdl.handle.net/11104/0269656