Electron temperature measurements in mid-latitude sporadic<i>E</i>layers

Schutz, S.; Smith, L. G.

doi:10.1029/ja081i019p03214

Cited by 13 publications

(6 citation statements)

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“…Oyama (oyama@jupiter.ss.ncu.edu.tw) For these reasons, only few T e data exist so far. Schutz and Smith (1976) reported T e of 520 K inside the E s layers at the heights of 108.5 km and 114.5 km. T e outside was 550 K at 106.5 km and 111.5 km, which means that T e inside E s was about 30 K lower than the ambient plasma.…”

Section: Introductionmentioning

confidence: 99%

Electron temperature in nighttime sporadic E layer at mid-latitude

et al. 2008

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Abstract. Electron temperature in the sporadic E layer was measured with a glass-sealed Langmuir probe at a midlatitude station in Japan in the framework of the SEEK (Sporadic E Experiment over Kyushu)-2 campaign which was conducted in August 2002. Important findings are two fold: (1) electron temperature and electron density vary in the opposite sense in the height range of 100-108 km, and electron temperature in the E s layer is lower than that of ambient plasma, (2) electron temperature in these height ranges is higher than the possible range of neutral temperature.These findings strongly suggest that the heat source that elevates electron temperature much higher than possible neutral temperature exists at around 100 km, and/or that the physical parameter values, which are used in the present theory to calculate electron temperature, are not proper.

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Section: Introductionmentioning

confidence: 99%

Electron temperature in nighttime sporadic E layer at mid-latitude

et al. 2008

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“…The value measured by Schutz & Smith (1976) was about 380K inside E s , while outside E s , the T e value at the lower edge and upper edge of the E s layer were found to be 500K and 550K, respectively. The measurement was done by using a pulsed probe.…”

Section: Fig 2 I-v Curvementioning

confidence: 97%

“…Most of the measurements report daytime T e , which is higher than the model neutral temperature T n (Smith et al 1968;Schutz & Smith 1976;Rohde et al 1993). During the daytime, the ionospheric electron density is about 10 5 els/cm 3 at the altitude of 95-120 km, while the density of neutral particles is 10 12 particles/ cm 3 .…”

Section: E Regionmentioning

confidence: 99%

DC Langmuir Probe for Measurement of Space Plasma: A Brief Review

Oyama¹

2015

Journal of Astronomy and Space Sciences

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“…where N is the electron density, K is Boltzmann's constant, e0 is the permittivity of free space, v is the intensity collision frequency (twice the momentum collision frequency), con is the angular plasma frequency, k• is the component of the wave normal perpendicular to the density gradient (i.e., parallel to density contours), and the density scale length H = N/(gN/ rgs), where s is the distance in the direction of the gradient. The values of scale length on the bottomside of an E8 layer obtained from the results of Schutz and Smith [1976] and from Smith [1977, 1978] vary between 300 and 800 m. A value of 500 m will be used here.…”

Section: Etna= 4nk(te+ T•) [ V •O • + 2kllh (1)mentioning

confidence: 99%

Langmuir wave propagation and the enhanced plasma line in sporadic E

Muldrew¹

1978

J. Geophys. Res.

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Observations of HF-induced plasma lines in blanketing sporadic E at Arecibo have been reported in the literature. The purely growing instability was found to be the probable source of the plasma lines, although the parametric decay instability could not be ruled out. It was also observed that the upshifted plasma lines tend to be much stronger than the downshifted plasma lines. A calculation of the purely growing and decay thresholds, using typical ray paths of the type thought to be responsible for the Arecibo observations, indicates that the purely growing instability is most likely responsible for the observed E• plasma lines. The purely growing threshold is smallest when it is determined by electron collisions rather than by the density gradient and when the wave normal of the unstable waves is nearly parallel to the earth's magnetic field. It is thus likely that the unstable Langmuir waves are generated where these conditions are satisfied and subsequently propagate to where they are observed by the radar. In order that these waves not be highly damped, the density gradient must be greater than about 10 ø off the vertical. This indicates that these waves propagate in ionization irregularities embedded in the E• layer. For irregularities with an upward component of density gradient directed north of the antimagnetic field direction, upshifted E• plasma lines would occur; otherwise, downshifted E• plasma lines would result. Since the former case covers a much larger range of angles than the latter case, it is not surprising that normally the upshifted E• plasma line is stronger than the downshifted E• plasma line.

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Electron temperature measurements in mid-latitude sporadicElayers

Cited by 13 publications

References 13 publications

Electron temperature in nighttime sporadic E layer at mid-latitude

Electron temperature in nighttime sporadic E layer at mid-latitude

DC Langmuir Probe for Measurement of Space Plasma: A Brief Review

Langmuir wave propagation and the enhanced plasma line in sporadic E

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