Daily Variation of the Geomagnetic Field and the Deformation of the Magnetosphere

Sarabhai, V.; Nair, K. U.

doi:10.1038/223603a0

Cited by 23 publications

(11 citation statements)

References 5 publications

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“…A few examples of the investigators were Sarabhai & Nair (1969), Hutton (1970), Matsushita (1971), Kane (1971a,b) andOnwumechili &Ezema (1977), who found that the depression or decrease at night-time relates to high disturbance (high sunspot number).…”

Section: Discussion Of the Resultsmentioning

confidence: 97%

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A study of rocket measurements of ionospheric currents-I. General setting and night-time ionospheric currents

Onwumechili

1992

Geophysical Journal International

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Some 76 results of rocket measurements of ionospheric currents worldwide from 1948 to 1973, have been collected and arranged into seven groups suggested by the characteristics of geomagnetic variations which they cause. Their organization and planned study in five parts are outlined. This first part also presents the study of the group of rocket measurements of night-time ionospheric currents. The finding from nine rocket flight results is that the attempts to detect night-time ionospheric currents with rocket-borne instruments in the low and mid-latitudes have not found distinctly clear indication of such currents. The remnant E-region electron density at night measured aboard two rockets led to calculated currents so small that they support the above finding. Discussion of the rocket and other relevant studies led to the conclusion that nocturnal ionospheric currents d o not seem to exist at any part of the solar cycle.

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Section: Discussion Of the Resultsmentioning

confidence: 97%

“…Indeed, sometime ago, Sarabhai & Nair (1969) suggested that Sq at low latitudes is a decrease from a daytime level to the night, implying that the datum level is somewhere in the daytime.…”

Section: Introductionmentioning

confidence: 98%

A study of rocket measurements of ionospheric currents-I. General setting and night-time ionospheric currents

Onwumechili

1992

Geophysical Journal International

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“…Active and complicated changes in the day-to day horizontal magnetic field have been explained in relation to changes in the winds at the ionospheric heights (Hasegawa, 1960). Contributions to the daily variations from the solar wind associated components under quiet magnetic conditions have been dealt in by Mead (1964), Sarabhai and Nair (1969), Olson (1970) and Bhargava and Yacob (1971). Fukushima and Kamide (1973a) proposed the role of field aligned currents associated with the magnetospheric plasma convection, in modifying the Sq field.…”

Section: Introductionmentioning

confidence: 99%

Magnetospheric Contribution to Low Latitude Sq Variation.

Alex

Rao

1995

J. geomagn. geoelec

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Non-regular features noticed in the quiet-time diurnal variation of H component on II December, 1990 (Ap = 2) and 12 December, 1990 (Ap = 7) in comparison with the average quiet day variations at a chain of equatorial, low and mid-latitude locations in the Indian longitude zone are studied. Stations away from the equatorial electrojet influence exhibited a minimum in the H field around 1600 LT followed by a secondary peak at 2100 LT. The globally observed anomalously enhanced variation in the "H' component at low and mid latitude is attributed to the effect of field aligned current driven by the magnetospheric plasma convection even during relatively quiet intervals. Causative mechanism to offset this peculiar feature, at equatorial locations is also discussed.

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“…Bhargava and Yacob (1971) had shown that increasing values of geomagnetic disturbance index, Ap, are associated with increasing values of daily means of geomagnetic field. Sarabhai and Nair (1969) had earlier suggested that the daily variation of the horizontal intensity at a low latitude station, outside the effect of EEJ is due to a decrease of the ambient field on the night side rather than an increase during the day time.…”

Section: Introductionmentioning

confidence: 99%

Investigating H and Z geomagnetic component disturbance field in the mid-latitude

2016

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Daily Variation of the Geomagnetic Field and the Deformation of the Magnetosphere

Cited by 23 publications

References 5 publications

A study of rocket measurements of ionospheric currents-I. General setting and night-time ionospheric currents

A study of rocket measurements of ionospheric currents-I. General setting and night-time ionospheric currents

Magnetospheric Contribution to Low Latitude Sq Variation.

Investigating H and Z geomagnetic component disturbance field in the mid-latitude

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