Measurements in the ionosphere during the solar eclipse of 20 July 1963

Details Measurements in the ionosphere during the solar eclipse of 20 July 1963 Measurements in the ionosphere during the solar eclipse of 20 July 1963

Jul 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965jatp...27..803s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 27, no. 7, pp. 803-808, IN3, 809-829

Physics

6

Scientific paper

The behavior of the ionosphere up to 200 km was observed in a series of rocket flights at Fort Churchill, Manitoba, during the solar eclipse of 20 July 1963. Six Nike Apache rockets were instrumented to measure electron density, electron temperature, Lyman-[alpha] radiation and a band of X-rays (44-60 Å). The electron density in the E-region (90-160 km) was reduced during the eclipse without any significant change in the shape of the profile. The rocket data show a time lag between the minimum area of the visible solar disk and the minimum electron density of much less than 3 min. Comparison with ionosonde data indicates a minimum value of 1× 10-7 cm3 sec-1 for the effective recombination coefficient of the E-layer. The rocket observations also indicate that the ionizing radiation causing the E-layer is reduced during the eclipse in proportion to the intensity of the measured band of X-rays. The variation of electron temperature in the E-region due to the eclipse is found to be small. The electron density in the D-region (50-90 km) shows a more complex variation. Between 79 and 89 km, a time lag of about 3 min is indicated, but at lower heights, as at greater heights, the time lag is much smaller. Below 72 km the effect of the eclipse on electron density is much more pronounced than at greater heights for the observations taken with 8 and 15 per cent of the disk visible, but not for the observation taken with 60 per cent of the disk visible.

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