| Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
| 公開日 |
2004-08-01 |
| タイトル |
|
|
タイトル |
Observation of ionospheric Alfven resonance at a middle latitude station |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
ionospheric Alfven resonator (IAR) |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
ionosphere |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
magnetosphere |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
polarization |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
departmental bulletin paper |
| ID登録 |
|
|
ID登録 |
10.15094/00006381 |
|
ID登録タイプ |
JaLC |
| ページ属性 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
P(論文) |
| 著者名(英) |
Hayakawa, Masashi
Molchanov, Oleg A.
Schekotov, Alexander Yu.
Fedorov, Evgeny
|
| 著者所属(英) |
|
|
言語 |
en |
|
値 |
University of Electro-Communications |
| 著者所属(英) |
|
|
言語 |
en |
|
値 |
Institute of Physics of the Earth, Russian Academy of Science |
| 著者所属(英) |
|
|
言語 |
en |
|
値 |
Institute of Physics of the Earth, Russian Academy of Science |
| 著者所属(英) |
|
|
言語 |
en |
|
値 |
Institute of Physics of the Earth, Russian Academy of Science |
| 抄録(英) |
|
|
内容記述タイプ |
Other |
|
内容記述 |
This paper intends to report on the statistical results on the spectral resonance structures of the ionospheric Alfven resonances (IAR) in the ULF frequency range 0.1-5.0 Hz on the basis of the analysis of long-term data obtained from July 2000 to December 2002 (2.5 years) at the Karimshino station (Kamchatka, Russia) (L=2.1) by the conventional 3-component search-coil magnetometer. We analyze both the dynamic spectra of three components and polarization spectra in order to distinguish IAR from other possible noises. The average frequency difference _F between the adjacent maxima, intensity and occurrence rate of the IAR spectra have been estimated from the averaged spectra. Early papers at middle latitudes have been based on a small data base. Based on our first long-term observation at middle latitude, new findings, especially related to the seasonal variation, have emerged from this analysis. (1) There is an evident seasonal variation in the occurrence rate with a maximum in the September-January period and an almost complete absence of IAR structures in the spring-early summer time. (2) Occurrence maximum in the diurnal variation is found at 21-23 LT in the autumn and winter. Almost all the IAR structures are observed at local nighttime. (3) The averaged _F is found to be about 0.2-0.5 Hz in the autumn period but it seems to increase up to 0.5-0.7 Hz in winter. (4) The IAR occurrence rate is inversely correlated with the Kp index of global magnetic activity. (5) The intensity of D component exceeds essentially that of H component of the IAR structures in a majority of cases. Diurnal variations of resonance frequencies in the H and D components are not always identical. Finally the mechanisms to explain the observed characteristics of the IAR have been discussed. |
|
言語 |
en |
| 雑誌書誌ID |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA11397422 |
| 書誌情報 |
Advances in polar upper atmosphere research
巻 18,
p. 65-76,
発行日 2004-08
|
| 出版者 |
|
|
出版者 |
National Institute of Polar Research |
|
言語 |
en |
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