Electrodynamic coupling of high and low latitudes: Observations on May 27, 1993

Kobea, A. T.; Richmond, A. D.; Emery, B. A.; Peymirat, C.; Lühr, H.; Moretto, T.; Hairston, M. R.; Amory‐Mazaudier, Christine

doi:10.1029/2000ja000058

Cited by 59 publications

(70 citation statements)

References 31 publications

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“…Many theoretical and experimental works during the last 3 decades dealt with the direct penetration of the polar cap electric field to equatorial latitudes [Wolf, 1970;Pellat and Laval, 1972;Senior and Blanc, 1984;Mazaudier et al, 1984;Spiro et al, 1988;Kobea et al, 2000;Peymirat et al, 2000].…”

Section: Ionospheric Disturbance Dynamomentioning

confidence: 99%

Magnetic signature of the ionospheric disturbance dynamo at equatorial latitudes: “D_dyn”

2005

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[1] During magnetic storms, wind disturbances produced by auroral phenomena can affect the whole thermospheric circulation and associated ionospheric dynamo currents for many hours after the end of the storms. In this paper we define criteria to select a new simple type of ionospheric disturbance dynamo events that allow a simple interpretation over all longitude sectors. These events exhibit a weak auroral activity during at least 24 UT hours, on the day after the storm. We analyze the magnetic disturbances ''D dyn '' observed at equatorial latitudes in the three longitude sectors of such selected events. It is found for all the cases that the amplitude of the H component of the Earth's magnetic field is reduced, on the day after storm at equatorial latitudes, in agreement with the ionospheric disturbance dynamo model (Blanc and Richmond, 1980). The observation of H component decrease on the day after storm is longitudinally asymmetric. The observed signature of the ionospheric disturbance dynamo process in a specific longitude sector is strongly dependent on the magnitude, the start time, and the duration of the storm.Citation: Le Huy, M., and C. Amory-Mazaudier (2005), Magnetic signature of the ionospheric disturbance dynamo at equatorial latitudes: ''D dyn '',

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Section: Ionospheric Disturbance Dynamomentioning

confidence: 99%

Magnetic signature of the ionospheric disturbance dynamo at equatorial latitudes: “D_dyn”

2005

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“…1, middle part, the auroral ionosphere (right side) is connected to the middle and equatorial ionosphere (left side). Two main physical processes are involved in the electrodynamic coupling between the high and low latitudes: 1) the prompt penetration of the magnetospheric convection electric field (Nishida et al, 1966;Nishida 1968;Vasyliunas, 1970;Kobéa et al, 2000) and 2) the ionospheric disturbance dynamo process (Blanc and Richmond, 1980;Mazaudier and Venkateswaran, 1990;Le Huy and Amory-Mazaudier, 2005). …”

Section: Solar Windmentioning

confidence: 99%

Sun-Earth System Interaction studies over Vietnam: an international cooperative project

Amory‐Mazaudier¹,

Cohen²,

Doumbia³

et al. 2006

Ann. Geophys.

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“…[2] During geomagnetic storms the deviations of the electric fields from their quiet-time pattern (disturbance electric fields) are frequently observed in the low-latitude ionosphere [e.g., Gonzales et al, 1979Gonzales et al, , 1983Kobea et al, 2000;Huang et al, 2005]. The disturbance electric fields play a significant role for the plasma distribution and the plasma instabilities in the low-latitude ionosphere and are often referred to as the primary source mechanism for the storm-time ionospheric disturbances.…”

Section: Introductionmentioning

confidence: 99%

Spike‐like change of the vertical E × B drift in the equatorial region during very large geomagnetic storms

Kil

Paxton

et al. 2007

Geophysical Research Letters

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We investigate the characteristics of the storm‐time disturbance electric fields in the equatorial region using the measurements of the vertical ion velocity from the Defense Meteorological Satellite Program F13 and the first Republic of China Satellite during the selected 43 geomagnetic storms of Dst <−100 nT in 2000–2004. The distinguishing feature in both observations is the occurrence of the spike‐like vertical E × B drift during the main phase of very large storms (Dst <−150 nT). The spikes occur simultaneously at different local times but the direction of the spikes shows a dependence on the local time. The spikes are upward on the dayside and downward on the nightside. The observed characteristics of the spikes can be explained by the penetration of the dawn‐to‐dusk polar cap electric field to low latitude.

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Electrodynamic coupling of high and low latitudes: Observations on May 27, 1993

Cited by 59 publications

References 31 publications

Magnetic signature of the ionospheric disturbance dynamo at equatorial latitudes: “D_dyn”

Magnetic signature of the ionospheric disturbance dynamo at equatorial latitudes: “D_dyn”

Sun-Earth System Interaction studies over Vietnam: an international cooperative project

Spike‐like change of the vertical E × B drift in the equatorial region during very large geomagnetic storms

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Electrodynamic coupling of high and low latitudes: Observations on May 27, 1993

Cited by 59 publications

References 31 publications

Magnetic signature of the ionospheric disturbance dynamo at equatorial latitudes: “Ddyn”

Magnetic signature of the ionospheric disturbance dynamo at equatorial latitudes: “Ddyn”

Sun-Earth System Interaction studies over Vietnam: an international cooperative project

Spike‐like change of the vertical E × B drift in the equatorial region during very large geomagnetic storms

Contact Info

Product

Resources

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Magnetic signature of the ionospheric disturbance dynamo at equatorial latitudes: “D_dyn”

Magnetic signature of the ionospheric disturbance dynamo at equatorial latitudes: “D_dyn”