JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
titleDetailed Structure of Electron Temperature and Density inside the Sporadic E Layer
Author(jpn)坂本, 優美花; 阿部, 琢美; 三宅, 亙
Author(eng)Sakamoto, Yumika; Abe, Takumi; Miyake, Wataru
Author Affiliation(jpn)東海大学; 宇宙航空研究開発機構宇宙科学研究所太陽系科学研究系(JAXA)(ISAS); 東海大学
Author Affiliation(eng)Tokai University; Department of Solar System Sciences, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS); Tokai University
Issue Date2018-10-25
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication titleJAXA Research and Development Report
Start page1
End page9
Publication date2018-10-25
AbstractUnusual current-voltage characteristics were found by the Fast Langmuir Probe measurement inside sporadic E (Es) layer during S-520-29 sounding rocket flight. The characteristics are caused by a significant gradient of electron density inside the Es layer. We employ a new analysis method for accurate estimation of the electron temperature and density. It also allows us to obtain the temperature and density in a shorter time interval than the voltage sweep period. Our new observation and analysis method provide us with first detailed structure of electron density and temperature inside the Es layer with an unprecedented spatial resolution. The maximum electron density and the minimum electron temperature observed inside Es layer are estimated to be 9.7×10(exp 5) cm-3 and 550 K, respectively, at an altitude of 98 km. The total thickness of the layer is about 1 km. Furthermore, the detailed trend of the electron temperature from its boundary toward the center of Es layer was revealed so clearly owing to the new method. Electron temperature in the surrounding region of the Es layer is found to be quite high, suggesting significant heating at the altitude range. The observed reduction of electron temperature in the Es layer embedded in an elevated temperature region is interpreted in terms of dependence of heat sources and cooling processes on the thermal electron density.
DescriptionPhysical characteristics: Original contains illustrations
形態: 図版あり
KeywordsIonosphere; Sporadic E layer; Electron density; Electron temperature; Sounding rocket; Energy budget
Document TypeTechnical Report
JAXA Category研究開発報告
NASA Subject CategoryGeophysics
Report NoJAXA-RR-18-002E

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