Solar‐minimum quiet time ion energization and outflow in dynamic boundary related coordinates

W. K Peterson; L Andersson; B. C Callahan; H. L Collin; J. D Scudder; A. W Yau

doi:10.1029/2008JA013059

Back

Solar‐minimum quiet time ion energization and outflow in dynamic boundary related coordinates

Journal article

Open access

Peer reviewed

Solar‐minimum quiet time ion energization and outflow in dynamic boundary related coordinates

W. K Peterson, L Andersson, B. C Callahan, H. L Collin, J. D Scudder and A. W Yau

Journal of Geophysical Research: Space Physics, Vol.113(A7), pp.A07222-n/a

07/2008

DOI: 10.1029/2008JA013059

Files and links (1)

url

https://doi.org/10.1029/2008JA013059View

Published (Version of record) Open Access

Abstract

We report hemispheric average fluxes and energies of outflowing energetic (0.015 < E/q < 33 keV) H+, O+, and He+ ions in dynamic boundary‐related coordinates, from observations obtained by the Polar/TIMAS instrument near 6000 km altitude in the southern hemisphere during quiet geomagnetic intervals at solar minimum. We discuss our observations in terms of known energization and transport processes. We find that only a small fraction of energetic ions escape from the ionosphere directly into the polar cap and at quiet times the characteristic energies of escaping H+ are between 30 and 300 eV in the cusp region and between 30 eV and 1.2 keV in the midnight sector. For O+ we conclude the characteristic energy in the cusp is ∼100 eV and between 150 and 600 eV in the midnight sector. Our data suggest that the relative energization and acceleration of O+ is significantly different in the noon quadrant. The observations and analysis presented here also suggest that O+ has activity dependent transport paths from the ionosphere to the ring current that have not previously been identified.

Ion outflow

magnetosphere/ionosphere coupling

magnetospheric modeling

Details

Title: Subtitle: Solar‐minimum quiet time ion energization and outflow in dynamic boundary related coordinates
Creators: W. K Peterson - University of Colorado Boulder
L Andersson - University of Colorado Boulder
B. C Callahan - University of Colorado Boulder
H. L Collin - Lockheed Martin ATC ADCS Palo Alto California USA
J. D Scudder - University of Iowa
A. W Yau - University of Calgary
Resource Type: Journal article
Publication Details: Journal of Geophysical Research: Space Physics, Vol.113(A7), pp.A07222-n/a
DOI: 10.1029/2008JA013059
ISSN: 0148-0227
eISSN: 2156-2202
Number of pages: 10
Language: English
Date published: 07/2008
Academic Unit: Physics and Astronomy
Record Identifier: 9984199930902771

Metrics

5 Record Views

60 Times Cited - Web of Science