夜間の電離層吸収 I.第2-8次南極観測船上短波電界強度測定
Observations of the nighttime ionospheric absorption have been carried out since 1958 on board the ship for the Japanese antarctic research. Field intensities of the HF standard frequency signals at different frequencies were measured during hours around midnight. In this paper, techniques of the me...
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電波研究所平磯支所
1971
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ftnipr:oai:nipr.repo.nii.ac.jp:00007597 2023-07-02T03:30:07+02:00 夜間の電離層吸収 I.第2-8次南極観測船上短波電界強度測定 ヤカン ノ デンリソウ キュウシュウ 1 ダイ2 8ジ ナンキョク カンソクセン ジョウ タンパ デンカイ キョウド ソクテイ 若井 登 大瀬 正美 田之畑 一男 Noboru WAKAI Masami OSE Kazuo TANOHATA 1971-01 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=7597 http://id.nii.ac.jp/1291/00007597/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7597&item_no=1&attribute_id=18&file_no=1 ja jpn 電波研究所平磯支所 電波研究所電波部 電波研究所山川電波観測所 Hiraiso Branch, Radio Research Laboratories Radio Research Laboratories Yamagawa Radio Wave Observatory, Radio Research Laboratories 国立極地研究所 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=7597 http://id.nii.ac.jp/1291/00007597/ AN00181831 00857289 南極資料, 39, 1-18(1971-01) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7597&item_no=1&attribute_id=18&file_no=1 551.510.535/.537 Departmental Bulletin Paper P(論文) 1971 ftnipr 2023-06-10T19:38:20Z Observations of the nighttime ionospheric absorption have been carried out since 1958 on board the ship for the Japanese antarctic research. Field intensities of the HF standard frequency signals at different frequencies were measured during hours around midnight. In this paper, techniques of the measurement for extracting a relatively small quantity of the nighttime absorption are described. Existence of the absorption is confirmed from the fact that the rate of decrease of field intensities against the ground range at a lower frequency is much larger than that at a higher frequency. Moreover, the dependence of absorption upon the solar activity is found out from the measurement over nine years in the declining epoch of the last solar cycle. A provisional expression for estimating the nighttime absorption is proposed. Report Antarc* Antarctic National Institute of Polar Research Repository, Japan Antarctic |
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Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
Japanese |
topic |
551.510.535/.537 |
spellingShingle |
551.510.535/.537 若井 登 大瀬 正美 田之畑 一男 Noboru WAKAI Masami OSE Kazuo TANOHATA 夜間の電離層吸収 I.第2-8次南極観測船上短波電界強度測定 |
topic_facet |
551.510.535/.537 |
description |
Observations of the nighttime ionospheric absorption have been carried out since 1958 on board the ship for the Japanese antarctic research. Field intensities of the HF standard frequency signals at different frequencies were measured during hours around midnight. In this paper, techniques of the measurement for extracting a relatively small quantity of the nighttime absorption are described. Existence of the absorption is confirmed from the fact that the rate of decrease of field intensities against the ground range at a lower frequency is much larger than that at a higher frequency. Moreover, the dependence of absorption upon the solar activity is found out from the measurement over nine years in the declining epoch of the last solar cycle. A provisional expression for estimating the nighttime absorption is proposed. |
format |
Report |
author |
若井 登 大瀬 正美 田之畑 一男 Noboru WAKAI Masami OSE Kazuo TANOHATA |
author_facet |
若井 登 大瀬 正美 田之畑 一男 Noboru WAKAI Masami OSE Kazuo TANOHATA |
author_sort |
若井 登 |
title |
夜間の電離層吸収 I.第2-8次南極観測船上短波電界強度測定 |
title_short |
夜間の電離層吸収 I.第2-8次南極観測船上短波電界強度測定 |
title_full |
夜間の電離層吸収 I.第2-8次南極観測船上短波電界強度測定 |
title_fullStr |
夜間の電離層吸収 I.第2-8次南極観測船上短波電界強度測定 |
title_full_unstemmed |
夜間の電離層吸収 I.第2-8次南極観測船上短波電界強度測定 |
title_sort |
夜間の電離層吸収 i.第2-8次南極観測船上短波電界強度測定 |
publisher |
電波研究所平磯支所 |
publishDate |
1971 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=7597 http://id.nii.ac.jp/1291/00007597/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7597&item_no=1&attribute_id=18&file_no=1 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=7597 http://id.nii.ac.jp/1291/00007597/ AN00181831 00857289 南極資料, 39, 1-18(1971-01) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7597&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1770274355080593408 |