Coupling mechanisms in the lower ionospheric-thermospheric system and manifestations in the formation and dynamics of intermediate and descending layers

Szuszczewicz, E. P.; Roble, R. G.; Wilkinson, Phil; Hanbaba, R.

doi:10.1016/0021-9169(94)00145-e

Cited by 53 publications

(44 citation statements)

References 10 publications

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“…Early studies (Fujitaka and Tohmatsu, 1973;Mathews and Bekeny, 1979;Tong et al, 1988Szuszczewicz et al, 1995) examined the different tidal motions that occur in layer production. These studies indicated that the intermediate layer behavior is controlled mainly by the semi-diurnal and quarter-diurnal tides, but did not clarify the seasonal characteristics of tidal motions.…”

Section: Discussionmentioning

confidence: 99%

“…Harper (1977), MacDougall (1978), Osterman et al (1994), and Szuszczewicz et al (1995) reported the descent rates associated with semi-diurnal tides to be 8 km/h, 3.5 km/h, 5.4 km/h, and 5-8 km/h, respectively. These previous experimental results closely approximate the initial descent rates, 4-8 km/h, for single-peak months in this investigation.…”

Section: Discussionmentioning

confidence: 99%

“…− 10 10 el/m 3 form in the daytime and nighttime, respectively (Wilkinson et al, 1992;Mathews et al, 1993;Szuszczewicz et al, 1995;Earle et al, 2000).…”

Section: Thin (∼5 Kmmentioning

confidence: 99%

“…Moreover, Rodger et al (1981) showed the characteristics of the nocturnal intermediate layers based on ionograms from South Georgia (54.8 • S, 323.5 • E). Finally, Szuszczewicz et al (1995) exploited the SUNDIAL data and TIGCM model to investigate the intermediate layers and designed a variety of tidal controls.…”

Section: Thin (∼5 Kmmentioning

confidence: 99%

“…According to Wilkinson et al (1992) and Szuszczewicz et al (1995), the H and C type Es are attributed to the intermediate layers. Therefore, this statistical analysis implements only the H and C type Es to study the intermediate layers.…”

Section: Seasonal and Diurnal Variationsmentioning

confidence: 99%

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The intermediate layers and associated tidal motions observed by a digisonde in the equatorial anomaly region

et al. 2003

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Abstract. This investigation presents an initial attempt toanalyze a full year of daily ionosonde observations relevant to the determination of plasma densities, tidal structures, and ion transports in the equatorial anomaly region of the lower ionosphere. Particular focus is on the intermediate layers, their seasonal and diurnal variations, and cause-effect relationships. The ionogram database was recorded using a digisonde portable sounder (DPS) at National Central University (NCU, 24 • 58 N, 121 • 11 E) during 1996. Statistical results indicate that the intermediate layers appear primarily during the daytime of the spring/winter months. The monthly median height characteristics reveal that the layers descend from high to low altitudes and different tidal motions control the layers in different months. Generally, the semi-diurnal and quarter-diurnal tides, which cause ionization convergence, are mainly in the spring/winter and summer/autumn months, respectively. Variations in the electron densities of the layers also indicate that the density increases could result from a great number of molecular and metallic ions. Furthermore, a novel approach to ionogram presentation is introduced to investigate the intermediate layers. This approach allows the DPS to characterize the detailed daily information of the intermediate layers.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…− 10 10 el/m 3 form in the daytime and nighttime, respectively (Wilkinson et al, 1992;Mathews et al, 1993;Szuszczewicz et al, 1995;Earle et al, 2000).…”

Section: Thin (∼5 Kmmentioning

confidence: 99%

Section: Thin (∼5 Kmmentioning

confidence: 99%

Section: Seasonal and Diurnal Variationsmentioning

confidence: 99%

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The intermediate layers and associated tidal motions observed by a digisonde in the equatorial anomaly region

et al. 2003

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A statistical analysis of sporadic E layer occurrence in the midlatitude China region

et al. 2017

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A statistical analysis of sporadic E layer recorded from September 2011 to September 2015 at four Chinese ionospheric sounding stations of Mohe (122.37°E, 53.50°N), Beijing (116.25°E, 40.25°N), Wuhan (114.61°E, 30.53°N), and Hainan (109.13°E, 19.52°N) is presented to investigate the characteristics of sporadic E layer at the middle latitudes over China. The occurrence of the sporadic E layer in midlatitude China region shows strong dependence on local time and season, consistent with previous studies. The occurrence of the midlatitude sporadic E layer is prominent at local daytime in summer season. The results also reveal that the postsunset sporadic E layer is statistically pronounced in midlatitude China region, possibly related to the nighttime midlatitude E region irregularities. The midlatitude sporadic E layer is modulated by atmospheric tidal waves and planetary waves at different latitudes. The occurrence of the midlatitude sporadic E layer also tends to increase with the level of geomagnetic activity on the basis of both the statistical analysis and case study.

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F region electric field effects on the intermediate layer dynamics during the evening prereversal enhancement at the equatorial region over Brazil

Santos

Batista

Brum

et al. 2020

Preprint

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It is well known that the electric field that controls the ionospheric plasma drifts is generated by the dynamo process in the E and F regions. During the day, the zonal electric field is directed to the east and produces the upward vertical drift, however, before its reversal to the west in the evening, a significant and fairly sharp increase in the eastward electric field is observed. This intensification in the vertical drift that is known as prereversal enhancement of the zonal electric field (PRE) is caused by the F region dynamo driven by the thermospheric zonal wind in the presence of a rapid decrease in the E layer conductivity across the terminator (I.

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Coupling mechanisms in the lower ionospheric-thermospheric system and manifestations in the formation and dynamics of intermediate and descending layers

Cited by 53 publications

References 10 publications

The intermediate layers and associated tidal motions observed by a digisonde in the equatorial anomaly region

The intermediate layers and associated tidal motions observed by a digisonde in the equatorial anomaly region

A statistical analysis of sporadic E layer occurrence in the midlatitude China region

F region electric field effects on the intermediate layer dynamics during the evening prereversal enhancement at the equatorial region over Brazil

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