Akebono/Suprathermal Mass Spectrometer observations of low-energy ion outflow: Dependence on magnetic activity and solar wind conditions

Details Akebono/Suprathermal Mass Spectrometer observations of low-energy ion outflow: Dependence on magnetic activity and solar wind conditions Akebono/Suprathermal Mass Spectrometer observations of low-energy ion outflow: Dependence on magnetic activity and solar wind conditions

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1093c&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 108, Issue A2, pp. SMP 14-1, CiteID 1093, DOI 10.1029/2001JA009200

Physics

30

Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Convection, Ionosphere: Plasma Convection

Scientific paper

We present observations by the Suprathermal Mass Spectrometer (SMS) on Akebono (EXOS-D) of ion outflow in the energy range from <1 to ~70 eV. These observations cover a unique region of phase space and present an opportunity to ``tie together'' observations from disparate satellites. Variation of the total hemispheric O+ and H+ outflow rates with solar radio flux (monitored by the Penticton F10.7 index), with geomagnetic activity (monitored by the Kp index), and with solar wind parameters is discussed. Comparisons of F10.7 and Kp trends to results from Polar and Dynamics Explorer-1 (DE-1) lead us to conclude that flows of H+ in this low energy range are entirely sufficient to account for higher-energy flows at higher altitudes. On the other hand, we infer a substantial amount of O+ at energies above 70 eV. Both H+ and O+ outflow rates in this range exhibit a strong correlation with the solar wind kinetic pressure, the solar wind electric field, and the variability in the interplanetary magnetic field (IMF) in the hour preceding. While these factors are also associated with increased geomagnetic activity (Kp), a separate, Kp-independent effect is also found, showing a correlation of ion outflow with solar wind density and an anticorrelation with solar wind velocity.

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