Editing Explorer 7 (section)

=== Trapped Radiation and Solar Protons ===
Two omnidirectional [[Geiger counter]]s (Anton 302 and 112) were used to conduct a comprehensive spatial and temporal monitoring of total cosmic-ray intensity, geomagnetically trapped corpuscular radiation, and [[Solar particle event|solar protons]]. The detector was sensitive to protons (E >20 MeV) and electrons (E >30 keV). The experiment operated satisfactorily from launch until 28 February 1961, except for a brief period in September and October 1960.<ref name="Instrument4">{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1959-009A-04|title=Experiment: Trapped Radiation and Solar Protons|publisher=NASA |date=28 October 2021|access-date=2 November 2021}} {{PD-notice}}</ref>