High-resolution backscatter power observations of 440-MHz E region coherent echoes at Millstone Hill

Details High-resolution backscatter power observations of 440-MHz E region coherent echoes at Millstone Hill High-resolution backscatter power observations of 440-MHz E region coherent echoes at Millstone Hill

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1251f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1251-1261.

Physics

12

Backscattering, E Region, Eiscat Radar System (Europe), Incoherent Scatter Radar, Scattering Cross Sections, Electric Field Strength, Ultrahigh Frequencies

Scientific paper

A 40-microns pulse length has been used to provide 10-s temporal and 6-km range resolution observations of E region coherent backscatter from the premidnight eastward electrojet region to the north of Millstone Hill. The observations can be divided into two categories: strong events in which the backscattered amplitude nears saturation and weak events in which spatial structure and large-amplitude variations are common. Calibrated observations find a typical volume scattering coefficient of about 10 to the -11th/m at 440 MHz during strong events with a maximum level of 9 x 10 to the -10th/m observed for brief intervals. During less intense events, the radar backscatter is modulated by about 30 dB in amplitude at Pc 5 frequencies (150-500 s) by waves with spatial wavelength 50-100 km. The observations support the premise that the weak irregularities grow linearly with electric field strength and reach a saturation amplitude beyond which the oscillating electric field of the Pc pulsation has little effect. The observed variation of backscattered power with range is interpreted using a geometrical model which accounts for the detailed antenna beam pattern, a magnetic aspect angle sensitivity of -10 dB per degree, and a thin layer of irregularities centered at 110 km altitude.

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