Ion drift measured by MU radar and its comparison with geomagnetic field variation.

Saryo, T.; Takeda, Masahiko; Araki, Tohru; Sato, Toru; Tsuda, Toshitaka; Fukao, S.; Katō, Susumu

doi:10.5636/jgg.41.597

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…The observations were principally performed for 2 or 3 days in each month. The method by which the electric field is derived from the drift measurement was described by Saryo et al [1989]. The amplitude of the electric field was estimated as the difference between maximum and minimum values of the electric field from 0600 to 1800 LT for the days when continuous drift data were available.…”

Section: Methods Of Analysismentioning

confidence: 99%

“… Mazaudier [1982] and Mazaudier and Blanc [1982] used the incoherent scatter drift data at Saint Santin and compared the estimated ionospheric currents with the geomagnetic variations. Saryo et al [1989] examined the drift data at Shigaraki and estimated the ionospheric currents by the electric field and compared the geomagnetic field variations. However, these are basically case studies, and thus statistical relationship between the drift observation and geomagnetic Sq field or ionospheric Sq currents is not clear yet.…”

Section: Introductionmentioning

confidence: 99%

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Relationship between electric field and currents in the ionosphere and the geomagnetic Sq field

2003

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[1] Relationships of the geomagnetic Sq field to the electric field, conductivity, and currents in the ionosphere were studied from the correlation of the Sq amplitude in the Y-component with that of the ionospheric electric field and Hall currents. The electric field was obtained from the observation by the MU radar from 1989 to 2001, and the currents were estimated from the obtained field and the conductivity calculated by using the electron density profile obtained from the IRI 90 model. Estimated daily amplitude of the ionospheric Hall currents fairly well explains that of the Sq field. It was shown that variation of the Sq amplitude is mainly caused by the local ionospheric conductivity even if the variation is treated by each season separately. Another interesting feature is that the Sq amplitude tends to be small in winter for the same estimated Hall ionospheric currents. This is caused either by the seasonal variation of Hall conductivity to the Pedersen conductivity causing the variation of the contribution of the Hall currents to the total currents or by the asymmetry of the neutral wind through the magnetic effect of the ionospheric currents driven by the wind or of the field-aligned currents flowing between the both hemispheres driven by the asymmetric dynamo action in the ionosphere.

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Section: Methods Of Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relationship between electric field and currents in the ionosphere and the geomagnetic Sq field

2003

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“…It may become necessary to invoke them to explain important longitudinal variations in electric field behavior, such as has been noted by EVANS (1978), OLIVER et al (1988) and SARYO et al (1989). Other wind components, not tidal in nature, may also be important in helping to explain the considerable day-to-day variability observed in dynamo effects.…”

Section: Modeling the Regular Global Ionospheric Dynamomentioning

confidence: 99%

The Ionospheric Wind Dynamo

Richmond

1991

J. geomagn. geoelec

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This paper presents a brief review of recent work concerning the global Ionospheric wind dynamo, with a view toward helping to define some principal directions for future research. Remaining problem areas are identified as: more accurate determination of the distributions of ionospheric conductivities, especially in the highly variable E region; determination of the distributions of winds in the Eregion under all seasonal conditions, especially the tidal components; improved understanding of the mutual coupling effects among variations in conductivities, thermospheric winds, and electric fields and currents; and quantitative understanding of the mutual coupling processes acting between the magnetospheric and ionospheric dynamos and the changes in the ionospheric dynamo occurring during magnetic storms.

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Geomagnetic field variation and the equivalent current system generated by an ionospheric dynamo at the solstice

Takeda

1990

Journal of Atmospheric and Terrestrial Physics

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Ion drift measured by MU radar and its comparison with geomagnetic field variation.

Cited by 5 publications

References 11 publications

Relationship between electric field and currents in the ionosphere and the geomagnetic Sq field

Relationship between electric field and currents in the ionosphere and the geomagnetic Sq field

The Ionospheric Wind Dynamo

Geomagnetic field variation and the equivalent current system generated by an ionospheric dynamo at the solstice

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