Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1997-11-01 |
タイトル |
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タイトル |
DIELECTRIC PROPERTIES OF ICE CONTAINING ACID AND SALT IMPURITIES AT MICROWAVE FREQUENCIES |
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言語 |
eng |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
departmental bulletin paper |
ID登録 |
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ID登録 |
10.15094/00003992 |
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ID登録タイプ |
JaLC |
ページ属性 |
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内容記述タイプ |
Other |
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内容記述 |
P(論文) |
記事種別(英) |
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en |
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ABSTRACT |
論文名よみ |
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その他のタイトル |
DIELECTRIC PROPERTIES OF ICE CONTAINING ACID AND SALT IMPURITIES AT MICROWAVE FREQUENCIES |
著者名よみ |
マツオカ, タケシ
フジタ, シュウジ
マエ, シンジ
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著者名(英) |
MATSUOKA, Takeshi
FUJITA, Shuji
MAE, Shinji
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著者所属(英) |
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en |
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Department of Applied Physics, Faculty of Engineering, Hokkaido University:(Present address)Communications Research Laboratory |
著者所属(英) |
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en |
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Department of Applied Physics, Faculty of Engineering, Hokkaido University |
著者所属(英) |
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en |
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Department of Applied Physics, Faculty of Engineering, Hokkaido University |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
To clarify the effects of ionic impurities on the dielectric properties of ice, the relative complex dielectric permittivities (ε^*=ε′-iε″) of ice containing acid and salt impurities were measured in a wide temperature range from -80 to -2℃ using the cavity resonator method at 5GHz. The dielectric properties of ice at microwave frequencies are necessary for understanding remote sensing signatures in polar regions, obtained by ice-radar and satellite-borne microwave radar and radiometer. Especially, the dielectric loss, ε″, of ice is an important parameter to understand the attenuation of electromagnetic waves in ice sheets. In the measurements, the ice samples contained the acids H_2SO_4 and HNO_3,and the salt NaCl. The impurity concentration was between (10)^<-5> and (10)^<-3>M (molarity). The results are as follows : The dielectric loss, ε″, of ice increased with the increases in temperature and contained impurity concentration. A sharp increase in ε″of ice containing (10)^<-4>M H_2SO_4,HNO_3 and NaCl was observed immediately above the eutectic points -73℃, -43℃ and -21℃, respectively. The sharp change shows that the aqueous solution of the contained impurity is formed in grain boundaries and triple junctions of the polycrystalline ice above the eutectic point. The penetration depths of microwaves at 5GHz into ice containing H_2SO_4,HNO_3 and NaCl were estimated from the temperature and concentration dependence of the dielectric permittivities. |
雑誌書誌ID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA10756213 |
書誌情報 |
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
巻 11,
p. 247,
発行日 1997-11
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出版者 |
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出版者 |
National Institute of Polar Research |