Characteristics of field-aligned E-region irregularities over Iioka /36 N/, Japan. I

Details Characteristics of field-aligned E-region irregularities over Iioka /36 N/, Japan. I Characteristics of field-aligned E-region irregularities over Iioka /36 N/, Japan. I

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..381t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, May 1982, p. 381-393, 395-397, 399-406.

Mathematics

Logic

43

E Region, Ionospheric Drift, Midlatitude Atmosphere, Radar Echoes, Traveling Ionospheric Disturbances, Atmospheric Electricity, Backscattering, Doppler Radar, Drift Rate, Geomagnetism, Ionosondes, Ionospheric Electron Density, Ionospheric Ion Density, Meteorological Parameters, Radar Scattering, Sporadic E Layer, Vertical Distribution

Scientific paper

Measurements with a 25-MHz radar over Iioka, Japan, reveal that field-aligned E-region irregularities occur mainly at night in association with sporadic E (Es) layers at an altitude range of about 100-110 km and that they drift predominantly westward with speeds of the order of 60 m/s. It is shown that these observed characteristics of the irregularities are in reasonable agreement with quantitative predictions of the gradient drift instability theory. The predictions are based on appropriate models for neutral air densities and temperatures, ionic composition and ionospheric electric field, and available observations of electron density profiles of the E and Es layers. Observations of multifrequency (4-64 MHz) echoes with an oblique incidence ionosonde and of Doppler spectra with a fixed frequency (25 MHz) radar are then presented and discussed. It is shown that the ionosonde observations are capable of being explained in terms of the linear theory of cross-field or gradient-drift instability, which is presumed to generate the field-aligned irregularities.

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