Modelling of Equatorial Phase and Amplitude Scintillations From Ogo-6 and Ae Irregularity Data

Basu, S.

doi:10.1016/b978-0-08-024439-6.50044-2

Low Latitude Aeronomical Processes 1980

DOI: 10.1016/b978-0-08-024439-6.50044-2

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Modelling of Equatorial Phase and Amplitude Scintillations From Ogo-6 and Ae Irregularity Data

S. Basu

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1981

1988

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Cited by 3 publications

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Some characteristics of spread F at the magnetic equatorial station Fortaleza

Abdu¹,

Batista²,

Bittencourt³

1981

J. Geophys. Res.

143

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Spread F in ionograms of both the range and frequency spread types is studied for the magnetic equatorial station Fortaleza (geographic coordinates 38°W, 4°S; dip latitude −1.7°) for a 1‐year period during 1978–1979). Satellite traces suggesting ionization structures with scale sizes of 100–200 km are found to be necessary precursors to the formation of the irregularities that give rise to range type spread F, whereas frequency type spread F was observed under different circumstances. Striking differences are noted in the spread F characteristics and related parameters over Fortaleza as compared with Huancayo (geographic coordinates 75.3°W, 12.05°S; dip latitude 0.6°) and Jicamarca (geographic coordinates 76.8°W, 11.95°S; dip latitude 0.9°), situated within only ∼38° in longitude west of Fortaleza. The postsunset maximum in h′F, in winter, is delayed by about 1½ hr with respect to other seasons over Fortaleza, as compared with Huancayo, where it occurs earlier in winter than in other seasons. Similar differences also exist in the prereversal peak near sunset in the vertical drift velocity (Vz) between Fortaleza and Jicamarca. The differences are attributed possibly to the large difference in the magnetic field declination and to other factors such as the difference in the magnetic field intensity and the relative separation between geographic and magnetic equators that exist between Fortaleza and the other stations.

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Some characteristics of spread F at the magnetic equatorial station Fortaleza

Abdu¹,

Batista²,

Bittencourt³

1981

J. Geophys. Res.

143

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Ionospheric electrodynamics and irregularities: A review of contributions by U.S. scientists from 1979 to 1982

Richmond¹

1983

Reviews of Geophysics

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The past four years have seen important advances in our understanding of global ionospheric electrodynamics and of ionospheric irregularities. The accumulation of ionization drift measurements by radar and satellite have led to the development of quantitative global electric field models. Extensive ground‐ and satellite‐based magnetic field measurements have given improved information about electric currents. Quantitative models of high‐latitude ionospheric electrical conductivities have been produced. Theoretical modeling efforts have given us the capability of inferring unknown electrodynamic parameters from measured quantities on a global basis, and allow us to assess quantitatively the influence of ionospheric electric fields and currents on the ionospheric plasma and on the neutral atmosphere. Ionospheric irregularities have also been extensively studied by both experimental and theoretical means in recent years, but are treated only very briefly in this report, with the reader referred to more comprehensive review articles for further information.

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Short‐term magnetic field alignment variations of equatorial ionospheric irregularities

Johnson¹

1988

Radio Science

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The ionospheric irregularities that cause equatorial scintillation are elongated along the north‐south magnetic field lines. During a 1981 field campaign at Ascension Island, 250‐MHz receivers were spaced from 300 m to 1.6 km along the field lines, and the signals received from the Marisat satellite were cross correlated. Data collected during eight nights of fading showed a linear relationship between fading rate and cross correlation. The alignment of the antennas was adjusted to give a zero time lag between the widely spaced receivers with a measurement accuracy of 0.03 s. Since the average irregularity velocity was 125 m/s, this time accuracy translated to an angular measurement accuracy of 0.1°. During a 4‐hour period of nightly fading, occasional differences in time of arrival were noted that corresponded to a tilt in the north‐south alignment of ±1°. Data from several nights of fading were analyzed, and each night exhibited the same variance in the north‐south irregularity alignment. It is postulated that the shift in the measured peak correlation may have been caused by patches of irregularities at different altitudes where the magnetic field lines have a slightly different direction.

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Modelling of Equatorial Phase and Amplitude Scintillations From Ogo-6 and Ae Irregularity Data

Cited by 3 publications

References 30 publications

Some characteristics of spread F at the magnetic equatorial station Fortaleza

Some characteristics of spread F at the magnetic equatorial station Fortaleza

Ionospheric electrodynamics and irregularities: A review of contributions by U.S. scientists from 1979 to 1982

Short‐term magnetic field alignment variations of equatorial ionospheric irregularities

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