Ion depletion zones in the polar wind - EXOS D suprathermal ion mass spectrometer observations in the polar cap

Details Ion depletion zones in the polar wind - EXOS D suprathermal ion mass spectrometer observations in the polar cap Ion depletion zones in the polar wind - EXOS D suprathermal ion mass spectrometer observations in the polar cap

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811439h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,439-11,448.

Physics

14

Exos-D Satellite, Ion Distribution, Ionospheric Ion Density, Molecular Ions, Polar Caps, Wind Velocity, Hydrogen Ions, Mass Spectrometers, Oxygen Ions

Scientific paper

In the high-altitude polar cap the suprathermal ion mass spectrometer (SMS) on the EXOS D (Akebono) satellite frequently 'observed' ion depletion zones (IDZ) in which the thermal-energy ion flux was below the detection limit of SMS, corresponding to thermal-energy ion densities less than 0.01/cu cm. These IDZ are located primarily in the nightside region of the magnetosphere at invariant latitudes above 70 deg and at altitudes preferentially near apogee and between 8000 and 10,000 km (EXOS-D apogee) but extending down to 3000 km. In contrast, outside the IDZ, the SMS regularly observed outflowing H(+), He(+), O(+), and O(2+) polar wind ions with energies typically less than 10 eV in the polar cap. Also, at sufficiently low altitudes below the IDZ the SMS instrument always observed H(+), He(+), O(+), and O(2+) ions that were stationary in the Earth's corotating frame, i.e., ions observed in the spacecraft ram direction.

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