NASA NTRS · 19690059890
Ion mass spectrometer on Explorer XXXI satellite.
Abstract
Explorer 31 ion mass spectrometer calibrated in flight and compared with Alouette 2 topside electron concentration data
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Hoffman, J. H.. 1969-06-01. Ion mass spectrometer on Explorer XXXI satellite.. https://ntrs.nasa.gov/citations/19690059890
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