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- W2008276405 abstract "This is a preliminary report of the first Polar Patrol Balloon (PPB) observation for auroral X-rays arose widely in the south polar region. The PPB No. 6 was launched from Syowa Station, Antarctica, on 5 January 1993, and flew along one and a half circumpolar paths, covering 6-13 g/cm2 atmospheric depth and 49°-81° invariant latitude. Distinct enhancements of bremsstrahlung X-rays (E=30-120 keV) measured by an omni-directional NaI(Tl) scintillation counter were often observed during the entire flight period of 27 days with low to moderate geomagnetic activity. Ninety-three percent of the enhancements of greater than 3000 counts/30 s, being about twice the atmospheric X-ray background flux, were observed in 60°-70° invariant latitude, and 71 percent in the magnetic local dayside sector. Thirty-four percent of the dayside enhancements occurred at low latitudes below 60°, suggesting a large-scale expansion of the X-ray auroral oval to lower latitudes. Auroral X-ray enhancements observed at >65° invariant latitude exhibit that their energy spectra progressively harden in the time interval from 6 to 18 h MLT, consisting with the statistical summary of Bewersdorff et al. (1966). A double exponent spectrum in which the exponent E0 becomes smaller in the low energy end below 50 keV is also found. Time profiles of the enhancements are well characterized by the systematic E0-flux relation that E0s are held within a definite range during the enhancement, otherwise they vary taking a minimum (or maximum) at the peak flux. These may suggest two different modes of energetic electron precipitations accompanying by stationary or variational spectrum from onset to recovery of the enhancement." @default.
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- W2008276405 date "1995-01-01" @default.
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- W2008276405 title "Circumpolar Observation of Bremsstrahlung X-Rays by a Polar Patrol Balloon over Antarctica." @default.
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- W2008276405 doi "https://doi.org/10.5636/jgg.47.253" @default.
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