Determination of the altitudinal peak of Cosmic Noise Absorption using a vertical parallax technique
The riometry technique is limited by its inability to directly determine the altitude of the principal ionospheric absorption layer during periods of enhanced Cosmic Noise Absorption (CNA). We describe here a technique based on the simple vertical parallax principle, enabling direct measurements of...
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American Geophysical Union
2004
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ftunivnewcastnsw:uon:3461 2023-05-15T13:45:38+02:00 Determination of the altitudinal peak of Cosmic Noise Absorption using a vertical parallax technique Terkildsen, M. B. Fraser, B. J. Yamagishi, H. The University of Newcastle. Faculty of Science & Information Technology, School of Mathematical and Physical Sciences 2004 http://hdl.handle.net/1959.13/34004 eng eng American Geophysical Union Geophysical Research Letters Vol. 31 10.1029/2003GL019068 auroral ionosphere ionosphere/magnetosphere interactions particle precipitation instruments and techniques magnetospheric physics energetic particles precipitating journal article 2004 ftunivnewcastnsw 2018-07-27T01:12:06Z The riometry technique is limited by its inability to directly determine the altitude of the principal ionospheric absorption layer during periods of enhanced Cosmic Noise Absorption (CNA). We describe here a technique based on the simple vertical parallax principle, enabling direct measurements of this altitude. The technique utilizes the overlapping beams of two closely spaced imaging riometers in Antarctica. Descriptive statistics on peak absorption heights are presented. The altitude determination of a D-region absorption event and an event that occurred in the F-region near 200 km altitude are presented in more detail. The identification of an F-region event using the parallax technique confirms earlier findings that radiowave absorption in the F-region is a potentially significant contributor to CNA. This technique enables a simple and repeatable ground-based measurement of the altitude of the CNA layer peak, and can be extended to estimating precipitation spectra based on peak absorption heights. Article in Journal/Newspaper Antarc* Antarctica NOVA: The University of Newcastle Research Online (Australia) |
institution |
Open Polar |
collection |
NOVA: The University of Newcastle Research Online (Australia) |
op_collection_id |
ftunivnewcastnsw |
language |
English |
topic |
auroral ionosphere ionosphere/magnetosphere interactions particle precipitation instruments and techniques magnetospheric physics energetic particles precipitating |
spellingShingle |
auroral ionosphere ionosphere/magnetosphere interactions particle precipitation instruments and techniques magnetospheric physics energetic particles precipitating Terkildsen, M. B. Fraser, B. J. Yamagishi, H. Determination of the altitudinal peak of Cosmic Noise Absorption using a vertical parallax technique |
topic_facet |
auroral ionosphere ionosphere/magnetosphere interactions particle precipitation instruments and techniques magnetospheric physics energetic particles precipitating |
description |
The riometry technique is limited by its inability to directly determine the altitude of the principal ionospheric absorption layer during periods of enhanced Cosmic Noise Absorption (CNA). We describe here a technique based on the simple vertical parallax principle, enabling direct measurements of this altitude. The technique utilizes the overlapping beams of two closely spaced imaging riometers in Antarctica. Descriptive statistics on peak absorption heights are presented. The altitude determination of a D-region absorption event and an event that occurred in the F-region near 200 km altitude are presented in more detail. The identification of an F-region event using the parallax technique confirms earlier findings that radiowave absorption in the F-region is a potentially significant contributor to CNA. This technique enables a simple and repeatable ground-based measurement of the altitude of the CNA layer peak, and can be extended to estimating precipitation spectra based on peak absorption heights. |
author2 |
The University of Newcastle. Faculty of Science & Information Technology, School of Mathematical and Physical Sciences |
format |
Article in Journal/Newspaper |
author |
Terkildsen, M. B. Fraser, B. J. Yamagishi, H. |
author_facet |
Terkildsen, M. B. Fraser, B. J. Yamagishi, H. |
author_sort |
Terkildsen, M. B. |
title |
Determination of the altitudinal peak of Cosmic Noise Absorption using a vertical parallax technique |
title_short |
Determination of the altitudinal peak of Cosmic Noise Absorption using a vertical parallax technique |
title_full |
Determination of the altitudinal peak of Cosmic Noise Absorption using a vertical parallax technique |
title_fullStr |
Determination of the altitudinal peak of Cosmic Noise Absorption using a vertical parallax technique |
title_full_unstemmed |
Determination of the altitudinal peak of Cosmic Noise Absorption using a vertical parallax technique |
title_sort |
determination of the altitudinal peak of cosmic noise absorption using a vertical parallax technique |
publisher |
American Geophysical Union |
publishDate |
2004 |
url |
http://hdl.handle.net/1959.13/34004 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Geophysical Research Letters Vol. 31 10.1029/2003GL019068 |
_version_ |
1766228720173973504 |