A balloon observation of auroral x-ray images in Norway

An equipped stratospheric balloon was launched from Abelver, Norway on 2117 UT 5 July 1985 in order to search the precipitating mechanisms of auroral particles through observations of the bremsstrahlung X rays in relation to the conjugacy of Syowa station, Antarctica. Observations of the X-ray images were carried out by using a horizontal two-dimentional array of Si(Li) semiconductor detectors and a one-dimensional array of eight NaI(Tl) scintillation counters. The Si(Li) detector imager has 5 x 5 pixels of which the central one has an angular resolution of 15 deg, and its total view is 62 deg. The NaI(Tl) imager has pixels of which the central one has a resolution of 15 deg, and its total view is 95 deg. All of them were self-rotated at spin rate of 0.3 rpm to obtain the X-ray images. During the flight an auroral X-ray burst was observed on 2325 UT 6 July. This burst appeared in the northwest sky and it's region was drifted to the southwest of the balloon. From the data analyses, the drift speed of this exent is estimated as about 50 km/min. (author)