Coupled electrodynamics in the nighttime midlatitude ionosphere

Tsunoda, Roland T.; Cosgrove, R. B.

doi:10.1029/2001gl013245

Cited by 123 publications

(144 citation statements)

References 23 publications

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“…The latter observation is relevant in light of the work in Tsunoda and Cosgrove [2001], where a possible coupling between the Perkins instability and an E s layer instability is described. All of these observations potentially involve the E s layer instability described herein.…”

Section: Discussionmentioning

confidence: 93%

A direction‐dependent instability of sporadic‐E layers in the nighttime midlatitude ionosphere

Cosgrove

Tsunoda

2002

Geophysical Research Letters

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143

214

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[1] The configuration of a midlatitude sporadic-E (E s ) layer at a zonal wind-shear node has been assumed to be a stable equilibrium, as long as the wind shear is hydrodynamically stable. In this paper, we show that this equilibrium is in fact unstable, at night, to electrodynamical forces that arise when plane wave perturbations in altitude or density are imposed on the E s layer. We show that the growth rate of the instability depends on the azimuthal alignment of the phase fronts of the plane-wave distortion, a feature that is reminiscient of the Perkins instability [Perkins, 1973]. The dependence on azimuth is consistent with observations of structure in E s layers that show the same preferred alignment.INDEX TERMS: 2471 Ionosphere: Plasma waves and instabilities. Citation: Cosgrove, R. B., and R. T. Tsunoda, A direction-dependent instability of sporadic-E layers in the nighttime midlatitude ionosphere, Geophys. Res.

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Section: Discussionmentioning

confidence: 93%

A direction‐dependent instability of sporadic‐E layers in the nighttime midlatitude ionosphere

Cosgrove

Tsunoda

2002

Geophysical Research Letters

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143

214

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“…The electric field with scales > 10 km can be mapped very efficiently between the E and F layers. Tsunoda and Cosgrove (2001) suggested that there is a large feedback polarization electric field mapped from the E layer and contributing to the F region irregularities. To validate the linkage between spread F and Es, Haldoupis et al (2003) investi- gated recordings of ionosonde in summer and found a precise corresponding relation between spread F and the patchy, sporadic E layer.…”

Section: Discussionmentioning

confidence: 99%

A comparative study of GPS ionospheric scintillations and ionogram spread F over Sanya

Zhang

Wan

et al. 2015

Ann. Geophys.

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Abstract. We analyze the data recorded during December 2011-November 2012 by a digital ionosonde and a GPS (Global Positioning System) scintillation and (total electron content) TEC receiver collocated at Sanya (109.6 • E, 18.3 • N; dip lat. 12.8 • N), a low-latitude station in the Chinese longitude sector, to carry out a comparative study of ionospheric scintillations and spread F. A good consistency between the temporal variations of GPS scintillation (represented by the S4 index) and of ionogram spread F (represented by the QF index) is found in the pre-midnight period during equinox. However in the post-midnight period during equinox and in the period from post-sunset to presunrise during June solstice, moderate spread F is seen without concurrent GPS scintillation. The possible cause responsible for the difference between post-midnight GPS scintillation and spread F during equinox could be due to the decaying of 400 m scale irregularities associated with equatorial spread F. Regarding the irregularities producing moderate QF and low S4 indices during June solstice, we suggest that the frequently observed sporadic E (Es) layer and the medium-scale traveling ionospheric disturbances (MSTIDs) over Sanya could play important roles in triggering the June solstitial spread-F events.

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“…These rises are explained as being due to drifts E p xB, where E p is the polarization electric field inside the MSTID structures. The electrodynamical coupling between the nighttime midlatitude ionospheric E s and F region have been invoked as an explanation for the large polarization electric fields observed in the F region and the consequent uplifts of the F layer which causes spread F [Tsunoda and Cosgrove, 2001]. Haldoupis et al [2003] proposed a mechanism for spread F development in the midlatitude ionosphere driven by northward-upward electric fields, which are generated from a meridional polarization field inside an unstable E s layer and maps to the F region via field lines.…”

Section: Discussionmentioning

confidence: 99%

Long-term study of medium-scale traveling ionospheric disturbances using O I 630 nm all-sky imaging and ionosonde over Brazilian low latitudes

et al. 2011

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[1] In this paper, we report a long-term study of medium-scale traveling ionospheric disturbance (MSTID) occurrence using all-sky images of O I 630 nm airglow emission. Our study is based on a 10.5 year data series in which 5.5 years compound a new data set. The images were obtained by an all-sky imager installed at Cachoeira Paulista (22.7°S, 45°W, 15°S magnetic latitude). Our results show the greatest occurrence of MSTIDs during solar minimum and a minor occurrence rate during descending and ascending solar activity periods. During solar maximum, we have not detected MSTID signatures on all-sky images. All detected events have occurred during geomagnetically quiet conditions. Simultaneous measurements using both all-sky images and ionograms obtained at the same site show the occurrence of spread F and a sharp rise in the ionospheric F layer at the same time as dark bands are optically registered over the zenith. It is possible that for certain weaker events, the ionosonde may resolve bands that are not sufficiently raised to cause darkening of the all-sky images. In order to investigate this possibility, we have conducted a study using only ionograms for a 1 year period (March 2000-February 2001 during solar maximum, when we have not seen any MSTID events in the all-sky images. As we conjectured, MSTIDs also occur during solar maximum, and the risings of the ionospheric F layer are not able to disturb the airglow layer during such events.Citation: Amorim, D. C. M., A. A. Pimenta, J. A. Bittencourt, and P. R. Fagundes (2011), Long-term study of medium-scale traveling ionospheric disturbances using O I 630 nm all-sky imaging and ionosonde over Brazilian low latitudes,

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Coupled electrodynamics in the nighttime midlatitude ionosphere

Cited by 123 publications

References 23 publications

A direction‐dependent instability of sporadic‐E layers in the nighttime midlatitude ionosphere

A direction‐dependent instability of sporadic‐E layers in the nighttime midlatitude ionosphere

A comparative study of GPS ionospheric scintillations and ionogram spread F over Sanya

Long-term study of medium-scale traveling ionospheric disturbances using O I 630 nm all-sky imaging and ionosonde over Brazilian low latitudes

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