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Midlatitude sporadic-E episodes viewed by L-band split-spectrum InSAR

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Title: Midlatitude sporadic-E episodes viewed by L-band split-spectrum InSAR
Authors: Suzuki, Takato Browse this author
Maeda, Jun Browse this author
Heki, Kosuke Browse this author
Furuya, Masato Browse this author →KAKEN DB
Keywords: Ionosphere
Total electron content
Interferometric synthetic aperture radar
Split-spectrum method
Dispersive media
Higher-order refractive index
Nondispersive media
Issue Date: 29-Dec-2017
Publisher: Springer
Journal Title: Earth planets and space
Volume: 69
Start Page: 175
Publisher DOI: 10.1186/s40623-017-0764-6
Abstract: Sporadic-E (Es) is a layer of ionization that irregularly appears within the E region of the ionosphere and is known to generate an unusual propagation of very high frequency waves over long distances. The detailed spatial structure of Es remains unclear due to the limited spatial resolution in the conventional ionosonde observations. We detect midlatitude Es by interferometric synthetic aperture radar (InSAR), which can clarify the spatial structure of Es with unprecedented resolution. Moreover, we use the range split-spectrum method (SSM) to separate dispersive and nondispersive components in the InSAR image. While InSAR SSM largely succeeds in decomposing into dispersive and nondispersive signals, our results indicate that small-scale dispersive signals due to the total electron content anomalies are accompanied by nondispersive signals with similar spatial scale at the same locations. We also examine the effects of higher-order terms in the refractive index for dispersive media. Both of these detected Es episodes indicate that smaller-scale dispersive effects originate from higher-order effects. We interpret that the smaller-scale nondispersive signals could indicate the emergence of nitric oxide (NO) generated by the reactions of metals, Mg and Fe, with nitric oxide ion (NO+) during the Es.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 古屋 正人

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