The EUV flux inferred from AE‐C He+ abundances

M. Oppenheimer, S. Babeu, J. H. Hoffman, E. Breig

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The ionization rate of helium in the thermosphere is inferred from He+ abundances determined by instrumentation on the Atmosphere Explorer‐C satellite. The inferred ionization rate is independent of the particular geophysical parameters of the thermosphere for solar zenith angles less than 80 degrees and altitudes between 280 and 360 km. The ionization rate is consistent with a value calculated from the EUV flux of Hinteregger below 504 Å.

Original languageEnglish (US)
Pages (from-to)773-776
Number of pages4
JournalGeophysical Research Letters
Issue number9
StatePublished - Sep 1978

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences


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