HF radio wave absorption in the nighttime. Part I. Measurements of the field intensity of HF radio waves on board the ship for the 2nd(1958)-8th(1966) Japanese Antarctic Research Expedition
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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National Institute of Polar Research
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ftdoajarticles:oai:doaj.org/article:70785ca842ac49fe85f670004063267c 2023-05-15T13:42:50+02:00 HF radio wave absorption in the nighttime. Part I. Measurements of the field intensity of HF radio waves on board the ship for the 2nd(1958)-8th(1966) Japanese Antarctic Research Expedition Noboru WAKAI Masami OSE Kazuo TANOHATA 1971-01-01T00:00:00Z https://doi.org/10.15094/00007597 https://doaj.org/article/70785ca842ac49fe85f670004063267c EN JA eng jpn National Institute of Polar Research https://doi.org/10.15094/00007597 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007597 0085-7289 2432-079X https://doaj.org/article/70785ca842ac49fe85f670004063267c Antarctic Record, Iss 39, Pp 1-18 (1971) Geography (General) G1-922 article 1971 ftdoajarticles https://doi.org/10.15094/00007597 2022-12-31T01:50:57Z 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. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Noboru WAKAI Masami OSE Kazuo TANOHATA HF radio wave absorption in the nighttime. Part I. Measurements of the field intensity of HF radio waves on board the ship for the 2nd(1958)-8th(1966) Japanese Antarctic Research Expedition |
topic_facet |
Geography (General) G1-922 |
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 |
Article in Journal/Newspaper |
author |
Noboru WAKAI Masami OSE Kazuo TANOHATA |
author_facet |
Noboru WAKAI Masami OSE Kazuo TANOHATA |
author_sort |
Noboru WAKAI |
title |
HF radio wave absorption in the nighttime. Part I. Measurements of the field intensity of HF radio waves on board the ship for the 2nd(1958)-8th(1966) Japanese Antarctic Research Expedition |
title_short |
HF radio wave absorption in the nighttime. Part I. Measurements of the field intensity of HF radio waves on board the ship for the 2nd(1958)-8th(1966) Japanese Antarctic Research Expedition |
title_full |
HF radio wave absorption in the nighttime. Part I. Measurements of the field intensity of HF radio waves on board the ship for the 2nd(1958)-8th(1966) Japanese Antarctic Research Expedition |
title_fullStr |
HF radio wave absorption in the nighttime. Part I. Measurements of the field intensity of HF radio waves on board the ship for the 2nd(1958)-8th(1966) Japanese Antarctic Research Expedition |
title_full_unstemmed |
HF radio wave absorption in the nighttime. Part I. Measurements of the field intensity of HF radio waves on board the ship for the 2nd(1958)-8th(1966) Japanese Antarctic Research Expedition |
title_sort |
hf radio wave absorption in the nighttime. part i. measurements of the field intensity of hf radio waves on board the ship for the 2nd(1958)-8th(1966) japanese antarctic research expedition |
publisher |
National Institute of Polar Research |
publishDate |
1971 |
url |
https://doi.org/10.15094/00007597 https://doaj.org/article/70785ca842ac49fe85f670004063267c |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Antarctic Record, Iss 39, Pp 1-18 (1971) |
op_relation |
https://doi.org/10.15094/00007597 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007597 0085-7289 2432-079X https://doaj.org/article/70785ca842ac49fe85f670004063267c |
op_doi |
https://doi.org/10.15094/00007597 |
_version_ |
1766173300834172928 |