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Interferometric phase velocity measurements (1984)

Moore, T. ; Kelley, M. C. ; Kintner, P. M. ; [et al.]

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Publication Date: 2019-06-28

Description: Phase velocities of plasma waves near the lower hybrid frequency were measured with an interferometer composed of two spatially separated electron-density probes. The plasma waves were produced in the F-region ionosphere by an argon ion beam. By calculating the normalized cross spectrum of the plasma waves a coherency of .98 was estimated along with a maximum phase difference of pi/3 radians between the two probes. This implies that the wavelength was 6 meters compared to an O(+) gyroradius of 3.8 meters, and that the phase velocity was 45 km/sec compared to an ion-beam velocity of 12.4 km/sec. These numbers compare favorably with recent predictions of a nonresonant mode produced by a dense ion beam.

Keywords: INSTRUMENTATION AND PHOTOGRAPHY

Type: Geophysical Research Letters (ISSN 0094-8276); 11; 19-22

Format: text

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