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Hiss or equatorial noise? Ambiguities in analyzing suprathermal ion plasma wave resonance
- Source :
- Journal of Geophysical Research: Space Physics. 121:9619-9631
- Publication Year :
- 2016
- Publisher :
- American Geophysical Union (AGU), 2016.
-
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.
- Subjects :
- Physics
education.field_of_study
Hiss
010504 meteorology & atmospheric sciences
Waves in plasmas
Population
Magnetosphere
Polarization (waves)
01 natural sciences
Magnetic field
Geophysics
Space and Planetary Science
Electric field
Physics::Space Physics
0103 physical sciences
Van Allen Probes
Atomic physics
education
010303 astronomy & astrophysics
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 21699402 and 21699380
- Volume :
- 121
- Database :
- OpenAIRE
- Journal :
- Journal of Geophysical Research: Space Physics
- Accession number :
- edsair.doi...........e3430afbc764203f375210f8977b98b6