Preliminary results of the National Bureau of Standards radio and ionospheric observations during the International Geophysical Year

Gates, David M.

doi:10.6028/jres.063d.004

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…From a study of true height profiles along 75øW meridian Wright [1960a] has found enhanced ionization density in the transition region in the late evening hours almost simultaneously with the rise in the equatorial F region. High electron densities were also reported at the transitionregion stations like Okinawa and Bo.got• during the late evening hours [Bateman et al, 1959;Gates, 1959]. In the present analysis it is shown that a characteristic postsunset rise of ]oF• occurs in the transition region in all the three (Asian, African, and American) longitudinal zones, and that it is msfinly controlled by solar activity and closely dependent on the height of the F layer in the equatorial region.…”

supporting

confidence: 61%

The postsunset rise off_oF₂in the transition region and its dependence on the postsunset rise ofh′Fin the equatorial region

Rao¹

1963

J. Geophys. Res.

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In the transition region lying between the equatorial anomaly region and the middle latitudes a characteristic postsunset rise in foF2 is observed during years of high sunspot activity. This phenomenon is found to depend on the evening height rise in the equatorial region. The analysis presented in this paper substantiates the view that the ionization lifted over the equatorial region is transported along the magnetic lines of force to the transition region.

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supporting

confidence: 61%

The postsunset rise off_oF₂in the transition region and its dependence on the postsunset rise ofh′Fin the equatorial region

Rao¹

1963

J. Geophys. Res.

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“…An intense mode of VHF propagation associated with equatorial sporadic E was found to occur and was demonstrated to be closely identifiable in time-variation and height with the equatorial electrojet. (A brief account of these findings was published by Gates [1959] and a more comprehensive report will be submitted shortly for publication.) As a result of Stanford UniversiW IGY backscatter studies at Huaneayo, Egan (Stanford University Radio Propagation Laboratory Tech.…”

Section: During the International Geophysicalmentioning

confidence: 97%

Radio echoes from field-aligned ionization above the magnetic equator and their resemblance to auroral echoes

Bowles¹,

Cohen²,

Ochs³

et al. 1960

J. Geophys. Res.

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During the International Geophysical Year, under the joint auspices of the United States National Committee for the IGY, the Voice of America, and the National Bureau of Standards, we operated a chain of 50 Mc/s VHF forward scatter circuits near the magnetic equator in South America [Bowles and Cohen, 1957]. An intense mode of VHF propagation associated with equatorial sporadic E was found to occur and was demonstrated to be closely identifiable in time‐variation and height with the equatorial electrojet. (A brief account of these findings was published by Gates [1959] and a more comprehensive report will be submitted shortly for publication.) As a result of Stanford University IGY backscatter studies at Huancayo, Egan (Stanford University Radio Propagation Laboratory Tech. Rept. 1, December 30, 1959, unpublished) confirmed our expectation [Bowles and Cohen, 1957] that the radio echoes from irregularities in the vicinity of the equatorial E region exhibit a magnetic‐field related aspect sensitivity similar to that of radio echoes from auroral ionization.

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“…In fact the electron density corresponding to an electrojet layer is several times larger than the electron density value of the adopted atmospheric model. The electron density at 100Km in the adopted model is 1.5x105 per cc which is smaller than the daytime electron density determined by radio methods at Huancayo, Peru (Gates, 1959). Therefore, it is imperative to use increased integrated Cowling conductivity for better estimate of electric field in the electrojet layer.…”

Section: Calculation Of Electric Field From Sq-magnetic Field and Rocmentioning

confidence: 99%

Role of Electric Field Generated in the Equatorial Electrojet Region

Singh

Misra

1967

J. geomagn. geoelec

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Adopting an atmospheric model for the sunspot maximum day, the height variation of various ionospheric conductivities have been computed. The electric currents are calculated from yearly averaged magnetic data for the sunspot maximum period in 1958. Using the height integrated Cowling conductivity, electric fields for five selected equatorial and nonequatorial stations have been obtained from the calculated electric currents. The electric currents and electric fields thus obtained have been compared with the electric field derived from the rocket measured electrojet current density. It is shown that such comparisons give good overall agreement of the results obtained from magnetic data and the rocket measurements.The electron temparature is calculated from Joule heating considerations.The resulting electron temparature has been found to be smaller than the rocket measured values, The vertical electron drift velocity produced by the electric field in the electrojet region has been calculated and is found to be higher than the earlier calculation of Hirono and Kitamura (1956) and compares well with the drift velocity values obtained from continuity equation.

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Preliminary results of the National Bureau of Standards radio and ionospheric observations during the International Geophysical Year

Cited by 4 publications

References 8 publications

The postsunset rise off_oF₂in the transition region and its dependence on the postsunset rise ofh′Fin the equatorial region

The postsunset rise off_oF₂in the transition region and its dependence on the postsunset rise ofh′Fin the equatorial region

Radio echoes from field-aligned ionization above the magnetic equator and their resemblance to auroral echoes

Role of Electric Field Generated in the Equatorial Electrojet Region

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Preliminary results of the National Bureau of Standards radio and ionospheric observations during the International Geophysical Year

Cited by 4 publications

References 8 publications

The postsunset rise offoF2in the transition region and its dependence on the postsunset rise ofh′Fin the equatorial region

The postsunset rise offoF2in the transition region and its dependence on the postsunset rise ofh′Fin the equatorial region

Radio echoes from field-aligned ionization above the magnetic equator and their resemblance to auroral echoes

Role of Electric Field Generated in the Equatorial Electrojet Region

Contact Info

Product

Resources

About

The postsunset rise off_oF₂in the transition region and its dependence on the postsunset rise ofh′Fin the equatorial region

The postsunset rise off_oF₂in the transition region and its dependence on the postsunset rise ofh′Fin the equatorial region