In January 1990, the Long Duration Exposure Facility (LDEF) spacecraft was retrieved after nearly 6 years in space in a 28.4 deg orbit at a mean altitude of 476 km. Onboard LDEF was NRL's Heavy Ions In Space (HIIS) experiment, comprising large thick stacks of plastic track detectors with a total collecting power of 2.0 sq m-sr. We report preliminary results on the observation of stopping Fe-group ions at energies far below the geomagnetic cutoff for fully-ionized galactic cosmic rays.
Below-cutoff ions in the heavy ions in space experiment
Advances in Space Research ; 15 , 1
1995-01-01
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Englisch
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