The Diffraction of Galactic Radio Waves as a Method of Investigating the Irregular Structure of the Ionosphere

Details The Diffraction of Galactic Radio Waves as a Method of Investigating the Irregular Structure of the Ionosphere The Diffraction of Galactic Radio Waves as a Method of Investigating the Irregular Structure of the Ionosphere

Oct 1952

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1952rspsa.214..494h&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 214, Issue 1119, pp. 494-514

Physics

30

Scientific paper

The amplitudes of the radio waves received from a radio star at two points separated by about 1 km have been studied and compared. The results indicate that the variations of phase and amplitude at one point can be ascribed to the steady drift of an irregular wave-pattern over the ground. It is shown how the structure and movement of the wave-pattern can be deduced from the observations. The irregular wave-pattern across the ground can be thought of as a diffraction pattern produced by the passage of the waves through a portion of the ionosphere which imposes irregular changes of phase on it, and it is shown how the ionospheric characteristics can be deduced. The ionospheric irregularities are shown to have a lateral extent of the order 2 to 10 km, and a variation of electron content of about 5 × 109 electrons per cm.2 It is deduced that the irregularities are at a height of about 400 km. They are most pronounced around midnight and exhibit little annual variation. The irregular portion of the ionosphere moves with a steady wind-like motion with a velocity of the order 100 to 300 m/s. The velocity decreases after midnight, and large velocities are associated with periods of magnetic disturbance.

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