An assessment of the contributions of various tidal winds to the Sq current system

Stening, R. J.

doi:10.1016/0032-0633(69)90095-6

Cited by 87 publications

(54 citation statements)

References 22 publications

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“…RICHMOND et al (1976), STENING (1969) andTARPLEY (1970) all show current patterns for modes of this sort which are similar to Fig. 9.…”

Section: The Constant' Current Systemsupporting

confidence: 69%

“…In fact the survey mainly revealed that knowledge about these components in the dynamo region is still very uncertain. Theoretical work on the dynamo effects of steady and diurnal winds (see RICHMOND et al, 1976;STENING, 1969) shows that the steady, and the propagating diurnal mode winds, are not very efficient at producing current systems. Nonpropagating (negative) mode diurnal winds are shown to be efficient producers of dynamo currents.…”

Section: Discussion Of the Seasonal Variation Current Systemmentioning

confidence: 99%

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Equatorial electrojet and Sq current system. II.

MacDougall

1979

J. geomagn. geoelec

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The separation' procedure described in Part I has been used to divide the Sq current system into three subsystems. The first of these is associated with seasonal variations and has current strength of about 100 kA. Its origin appears to be semidiurnal winds.The second subsystem is called the Fuquene' system and has a strength about 150 kA (50%).It appears to be due to magnetospheric sources and, at least at the equator, may not flow at ionospheric heights.The third subsystem is called the constant' and has a strength of about 220 kA (500). It is possibly due to direct ionospheric heating.

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“…RICHMOND et al (1976), STENING (1969) andTARPLEY (1970) all show current patterns for modes of this sort which are similar to Fig. 9.…”

Section: The Constant' Current Systemsupporting

confidence: 69%

Section: Discussion Of the Seasonal Variation Current Systemmentioning

confidence: 99%

Equatorial electrojet and Sq current system. II.

MacDougall

1979

J. geomagn. geoelec

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“…Early simulations of the ionospheric dynamo (Stening 1969;Tarpley 1970;Richmond et al 1976;Forbes and Lindzen 1976a) demonstrated that the negative-mode diurnal tide can generate a global electric current system similar to those derived from Sq variations. Thus, the negative-mode diurnal tide was considered to be the primary driver of the Sq currents.…”

Section: Geomagnetic Daily Variations and Atmospheric Tidesmentioning

confidence: 96%

Sq and EEJ—A Review on the Daily Variation of the Geomagnetic Field Caused by Ionospheric Dynamo Currents

2016

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A record of the geomagnetic field on the ground sometimes shows smooth daily variations on the order of a few tens of nano teslas. These daily variations, commonly known as Sq, are caused by electric currents of several μA/m 2 flowing on the sunlit side of the Eregion ionosphere at about 90-150 km heights. We review advances in our understanding of the geomagnetic daily variation and its source ionospheric currents during the past 75 years. Observations and existing theories are first outlined as background knowledge for the nonspecialist. Data analysis methods, such as spherical harmonic analysis, are then described in detail. Various aspects of the geomagnetic daily variation are discussed and interpreted using these results. Finally, remaining issues are highlighted to provide possible directions for future work.

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“…The M2 and Ol terms both have a 2v dependency but 01 is diurnal in local time. The diurnal tide generated will be similar to the solar diurnal propagating tide, which has a short vertical wave-length and so is only about 1/5 as effective in generating currents in the ionospheric dynamo region (STENING, 1969). Its contribution is then only about 8 % of the dominant M2 term.…”

Section: Theoretical Backgroundmentioning

confidence: 97%

Problems of identifying lunar geomagnetic effects at Huancayo.

Stening

1975

J. geomagn. geoelec

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Monthly and semimonthly harmonic analyses of H are performed and some evidence of a diurnal variation of the lunar tide strength is found. Contamination of the data by magnetic disturbance can be identified by examining the phase progression in local time of the semimonthly component. This contamination is also found in the work of some other authors. It is suggested that some effects previously described as "lunar" are due to other causes.

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An assessment of the contributions of various tidal winds to the Sq current system

Cited by 87 publications

References 22 publications

Equatorial electrojet and Sq current system. II.

Equatorial electrojet and Sq current system. II.

Sq and EEJ—A Review on the Daily Variation of the Geomagnetic Field Caused by Ionospheric Dynamo Currents

Problems of identifying lunar geomagnetic effects at Huancayo.

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