[en] The first part of the balloon campaign of 1971 was planned mainly to measure X-rays with newly developed payloads; part two had the aim to measure simultaneously X-rays and auroral emissions. A short description of the payloads and counting rate versus time plots obtained during the flights is given

[en] Complete text of publication follows. For the aurora of 1808 Humboldt has been described the relation between it and magnetic disturbances. The importance of the auroras of 1808-1810 will be demonstrated in relation to Humboldt's observations.

[en] This is the fourth of a series of data reports in support of the International Magnetospheric Study (IMS) and includes selected geomagnetic variation data for April 1976. Included are analog records from eight auroral zone stations; preliminary AE indices based on these data; and various related tables, graphs, and statistics

No abstract available

[en] This is the second of a series of data reports in support of the International Magnetospheric Study (IMS) and includes selected geomagnetic variation data for February 1976; the first (UAG-60) gave similar data for January 1976. Included herein are analog records from seven auroral zone stations, preliminary AE indices based on these data and various related tables, graphs and statistics. It is expected that this series will continue on an increasingly timely schedule and with data from additional stations which may be processed in time for publication

[en] Published in summary form only

[en] Some results of balloon measurements of the electric field in the auroral zone during quiet time and during substorms are presented. The experiments were carried out according to the Soviet-French programm SAMBO-1. The data show the values of the three components of the electric field during quiet conditions and in the 'Harang discontinuity' sector. In the midnight and morning sector during geomagnetic bays, the zonal component of the electric field exhibits significant changes: during the initial an recovery phases of the substorms, it is directed westwards, and during the active phase eastwards

[en] A summary of experimental evidence for the existence of electric fields having components parallel to the magnetic field direction in the auroral zone ionosphere is presented. Errors of the measurements are analyzed with the conclusion that no known uncertainties can account for the 10 mV/m parallel electric fields that are frequently observed

[en] This is the third of a series of data reports in support of the International Magnetospheric Study (IMS) and includes selected geomagnetic variation data for March 1976; the first (UAG-60) gave similar data for January 1976. Included are analog records from seven auroral zone stations; preliminary AE indices based on these data; and various related tables, graphs, and statistics

[en] Thirty-seven astrometric positions with an rms residual of 1.5 arcsec are reported for comet P/Halley. The observations were made with a 50-cm reflector at Skibotn Observatory in the interval 9 October 1985-10 January 1986. The equipment, the observing and reduction procedures, and the special problems besetting astrometric observations due to aurora are briefly described