Physics
Scientific paper
Jul 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959jgr....64..697p&link_type=abstract
Journal of Geophysical Research, vol. 64, issue 7, pp. 697-707
Physics
100
Scientific paper
A burst of high-energy radiation coincident with a solar flare has been detected during a balloon flight at 10 gm/cm2 atmosphere depth and 30° geomagnetic latitude over Cuba. The flare occurred at 1305 UT on March 20, 1958 and was associated with solar radio bursts on 1,500 and 10,000 Mc/s. Terrestrial effects included a SID, earth-current disturbances, and a magnetic crotchet. The 18-second burst was detected with an integrating ionization chamber and a single Geiger counter. From these two instruments and their ratio, it is inferred that the radiation is due to a gamma-ray flux of about 2 × 10-5 ergs/sec cm2 peaked in the 200 to 500-Kv region. This radiation can be interpreted as bremsstrahlung produced in the solar photosphere from electrons of 0.5 to 1 Mev energy. These same electrons, spiraling in a 1000-gauss field in the flare region, can produce the observed radio burst by betatron radiation. The high-energy electrons represent about 1 per cent of the flare energy. Only about 0.01 per cent of the emitted betatron radiation escaped from the flare region toward the earth.
Peterson Laurence E.
Winckler John R.
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