Abstract
For measurements of cosmic and solar gamma‐rays, hard X‐rays, and particles, Antarctica offers the potential for very long, 10–20 day, continuous, twenty‐four‐hour‐a‐day observations, with balloon flights circling the South Pole during austral summer. For X‐ray/gamma‐ray sources at high south latitude the overlying atmosphere is minimized, and for cosmic ray measurements the low geomagnetic cutoff permits entry of low rigidity particles. The first Antarctic flight of a heavy (∼2400 lb.) payload on a large (11.6×106 cu. ft.) balloon took place in January, 1988, to search for the gamma‐ray lines of 56Co produced in the new supernova SN 1987A in the Large Magellanic Cloud. The long duration balloon flights presently planned from Antarctica include those for further gamma‐ray/hard X‐ray studies of SN 1987A and for the NASA Max ’91 program for solar flare studies.
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