Van Allen Probes observations of oxygen cyclotron harmonic waves in the inner magnetosphere

M. E Usanova; D. M Malaspina; A. N Jaynes; R. J Bruder; I. R Mann; J. R Wygant; R. E Ergun

doi:10.1002/2016GL070233

Back

Van Allen Probes observations of oxygen cyclotron harmonic waves in the inner magnetosphere

Journal article

Peer reviewed

Van Allen Probes observations of oxygen cyclotron harmonic waves in the inner magnetosphere

M. E Usanova, D. M Malaspina, A. N Jaynes, R. J Bruder, I. R Mann, J. R Wygant and R. E Ergun

Geophysical research letters, Vol.43(17), pp.8827-8834

09/16/2016

DOI: 10.1002/2016GL070233

Files and links (1)

url

https://doaj.org/article/6cf6c723bc6640afa9156c5d60645e2dView

Open Access

Abstract

Waves with frequencies in the vicinity of the oxygen cyclotron frequency and its harmonics have been regularly observed on the Van Allen Probes satellites during geomagnetic storms. We focus on properties of these waves and present events from the main phase of two storms on 1 November 2012 and 17 March 2013 and associated dropouts of a few MeV electron fluxes. They are electromagnetic, in the frequency range ~0.5 to several Hz, and amplitude ~0.1 to a few nT in magnetic and ~0.1 to a few mV/m in electric field, with both the wave velocity and the Poynting vector directed almost parallel to the background magnetic field. These properties are very similar to those of electromagnetic ion cyclotron waves, which are believed to contribute to loss of ring current ions and radiation belt electrons and therefore can be also important for inner magnetosphere dynamics. Key Points Oxygen cyclotron harmonic waves are often observed during the main phase of geomagnetic storms For the first time, we report observations of parallel propagating oxygen harmonic waves with properties similar to those of EMIC waves These waves can contribute to loss of energetic particles in the ring current and radiation belts

cyclotron harmonic waves

energetic particle loss

geomagnetic storms

inner magnetosphere

oxygen

Van Allen Probes

Details

Title: Subtitle: Van Allen Probes observations of oxygen cyclotron harmonic waves in the inner magnetosphere
Creators: M. E Usanova - University of Colorado Boulder
D. M Malaspina - University of Colorado Boulder
A. N Jaynes - University of Colorado Boulder
R. J Bruder - University of Colorado Boulder
I. R Mann - University of Alberta
J. R Wygant - University of Minnesota
R. E Ergun - University of Colorado Boulder
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.43(17), pp.8827-8834
DOI: 10.1002/2016GL070233
ISSN: 0094-8276
eISSN: 1944-8007
Number of pages: 8
Grant note: NASA (NAS5‐01072; NNX16AF91G)
Language: English
Date published: 09/16/2016
Academic Unit: Physics and Astronomy; University College Courses
Record Identifier: 9984199837502771

Metrics

10 Record Views

37 Times Cited - Web of Science