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    • Keywords


      Pulse Height; Pulse Height Spectrum; Isotropic Background; Thermal Radiation Spectrum; Balloon Altitude

    • Abstract


      The observations of omnidirectional X-ray flux at the top of the atmosphere have been extended upto 200 KeV using a balloon-borne NaI (Tl) scintillator detector at Hyderabad, India. The omnidirectional flux at 60 KeV is found to be 0·0066±0·0014 photons/cm.2 sec. ster. KeV. The X-ray flux in the energy range 50–290 KeV can be adequately represented by the spectrum Ke−2.2±0.4. New upper limits to the hard X-ray flux from the quiet sun have also been obtained from the same measurement.

    • Author Affiliations


      U R Rao1 E V Chitnis1 A S Prakasarao1

      1. Physical Research Laboratory, Ahmedabad, India
    • Dates


© 2021-2022 Indian Academy of Sciences, Bengaluru.