Structure of the auroral ionosphere observed by the antarctic rockets S-310JA-11 and -12.

Takahashi, T.; Oya, Hiroshi; Fukunishi, H.; Watanabe, Yuzo; Yamagishi, Hisakazu

doi:10.5636/jgg.40.843

Cited by 4 publications

(1 citation statement)

References 10 publications

(4 reference statements)

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“…In previous studies, electron density values often reached 10 6 cm −3 in an active auroral arc (e.g., Takahashi et al, 1988). It was also reported that the peak altitude was correspondent to the average energy of the auroral particles.…”

Section: Evaluations Of Electron Density Profilesmentioning

confidence: 99%

Electron density measurement under the influence of auroral precipitation and electron beam injection during the DELTA campaign

Wakabayashi

Ono

2006

Earth Planet Sp

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The direct observation of electron number density was successfully carried out using an impedance probe onboard the S310-35 sounding rocket during the DELTA (Dynamics and Energetics of the Lower Thermosphere in Aurora) campaign, which provided the altitude profile along the rocket trajectory in a diffuse aurora. The plasma density profile showed clear density enhancements due to the auroral precipitation as well as artificial ionizations induced by the electron beam injection. The enhanced ionization due to the electron beam experiment was too high to be determined by means of the detection of the UHR (Upper Hybrid Resonance) frequencies. To overcome this difficulty, SHR (Sheath Resonance) frequency and sheath capacitance values were used to deduce the plasma density in the artificially ionized region. Based on the SHR analysis method, we were able to determine the maximum density to be 2 · 10 6 cm −3 at the altitude of 98.9 km; this measurement was ascribed to the artificial ionization by the 1-keV electron beam in comparison with the results of particle detector instrument on-board the S310-35. The data analysis of the sheath capacitance was able to distinguish the natural ionization region from the artificial one. The impedance probe measurement was able to evaluate the ionospheric conductivities which have important properties for evaluating the Joule heating process in the thermosphere. Both Pedersen and Hall conductivities showed distinctive enhancement around an altitude of 128 km which were due to the auroral particle precipitation.

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Section: Evaluations Of Electron Density Profilesmentioning

confidence: 99%

Electron density measurement under the influence of auroral precipitation and electron beam injection during the DELTA campaign

Wakabayashi

Ono

2006

Earth Planet Sp

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Some features of electron density behaviour in the high latitude D-region derived from in situ measurements

Данилов

Смирнова

Blix³

et al. 2003

Journal of Atmospheric and Solar-Terrestrial Physics

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Comparative analysis of electron density and electric field fluctuations in highly active aurora observed by sounding rocket S-310JA-12.

Mori

Sagawa

Ogawa

et al. 1988

J. geomagn. geoelec

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The S-310JA-12 rocket was launched toward geomagnetic north from Syowa Station, Antarctica, during a strong substorm. A Faraday cup aboard the rocket measured electron density and its fluctuations up to 5 kHz, together with total flux of electrons having energies above 105eV, while a pair of probes measured DC electric fields and electric field fluctuations in the 5-220 Hz range. During ascent, the Faraday cup detected burst-like fluctuations between 140km and 200km in altitude, which are believed to have been artificially generated around the rocket. Around the altitude of 220km, quasi-sinusoidal waves of about 150 Hz were observed by both instruments. From the cross-correlation analysis, they are found to be right-handed, circularly or elliptically poralized waves. During descent, the rocket passed through a highly active aurora and observed strong ELF fluctuations. The Faraday cup measurements suggest that the rocket was charged to several volts by the precipitating electrons.

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Structure of the auroral ionosphere observed by the antarctic rockets S-310JA-11 and -12.

Cited by 4 publications

References 10 publications

Electron density measurement under the influence of auroral precipitation and electron beam injection during the DELTA campaign

Electron density measurement under the influence of auroral precipitation and electron beam injection during the DELTA campaign

Some features of electron density behaviour in the high latitude D-region derived from in situ measurements

Comparative analysis of electron density and electric field fluctuations in highly active aurora observed by sounding rocket S-310JA-12.

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