Atmospheric X-rays at 11 deg S geomagnetic latitude

Computer Science – Sound

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Atmospheric Radiation, Atmospheric Sounding, Balloon Sounding, Cosmic X Rays, Balloon-Borne Instruments, Brazil, Cosmic Ray Showers, Scintillation Counters, Sodium Iodides

Scientific paper

X-ray measurements at balloon altitudes were performed at Sao Jose dos Campos, Brazil (23 deg 12 min. S, 45 deg 51 min. W geographic coordinates, -11 deg S geomagnetic latitude) on December 18, 1981, using an omnidirectional NaI(Tl) scintillation detector. Atmospheric X-rays, namely, secondary X-radiation from cosmic rays, were measured for the energy interval of 30 to 155 MeV and up to an atmospheric depth of 5.5 g/sq cm. A comparison of the flux measured at the Pfotzer maximum during these measurements with those obtained in the post by several research groups, at other latitudes and with similar technique, is also shown. Finally, a comparison of the atmospheric component with that attributed to the diffuse component is also presented and it is concluded that both components are of about the same magnitude at L approximately 5 g/sq cm and at approximately 11 deg S geomagnetic latitude.

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