First measurement of ~10 keV neutral atoms in the low-latitude ionosphere

Details First measurement of ~10 keV neutral atoms in the low-latitude ionosphere First measurement of ~10 keV neutral atoms in the low-latitude ionosphere

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26...33a&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 1, p. 33-36

Physics

4

Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Ring Current, Ionosphere: Equatorial Ionosphere

Scientific paper

Energetic neutral atoms (ENAs) with energies of 4 to 35 keV were measured at altitudes of 170 to 570 km by a new ENA instrument on board a sounding rocket. The instrument measured particles precipitating into the ionosphere from the equatorial region of the magnetosphere at a magnetic local time of ~1830. The geomagnetic activity was quiet for a prolonged period before the launch. The measured ENA flux was ~102(cm2sstrkeV)-1 at energies of ~10 keV. The energy spectrum is in a good agreement with an expected spectrum of hydrogen atoms originating from the ring current region as reported by Milillo et al. [1996]. The altitude profile is also discussed in terms of collisional interaction of ENAs with upper-atmospheric constituents.

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