Zobrazeno 1 - 10
of 14
pro vyhledávání: '"R. S. Unwin"'
Autor:
R. S., UNWIN, C. H., CUMMACK
Publikováno v:
Memoirs of National Institute of Polar Research. Special issue. 16:72-83
A VHF doppler auroral radar operating in the south of New Zealand since early 1978 has quite frequently observed long persisting echoes with large doppler shifts over a limited range interval. These are confined to dark hours, are primarily in the pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=jairo_______::5aa6bc55c09a9eb3cfa8a2c136ff0028
http://id.nii.ac.jp/1291/00001075/
http://id.nii.ac.jp/1291/00001075/
Publikováno v:
Proceedings of the Physical Society. Section B. 63:595-616
A Fohn wind blowing off-shore produces super-refraction at radio frequencies. This results in the guiding of very high frequency radio waves beyond the horizon in a radio duct close to the sea surface. The problems involved and the experimental techn
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::00dc2cc6edd3d199e88722ee0300c342
https://doi.org/10.1088/0370-1301/63/8/307
https://doi.org/10.1088/0370-1301/63/8/307
Publikováno v:
Proceedings of the Physical Society. Section B. 65:981-989
This paper describes an approximate method for extending the simple mode theory of tropospheric refraction (Booker and Walkinshaw 1947) to cover situations where the refractive index profile varies with range The transmission path is divided into a n
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6eb4cc68b9d28e5de7b1023a6f825900
https://doi.org/10.1088/0370-1301/65/12/310
https://doi.org/10.1088/0370-1301/65/12/310
Autor:
F. B. Knox, R. S. Unwin
Publikováno v:
Radio Science. 6:1061-1077
H. G. Booker's (1956) theory of the radio aurora as a random assembly of field-aligned irregularities has been unsuccessful in explaining many observations, and this lack of success has led to the application of plasma instability theory to the pheno
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3cd622e2077bc944a840660bbbd4b008
https://doi.org/10.1029/rs006i012p01061
https://doi.org/10.1029/rs006i012p01061
Autor:
R. S. Unwin
Publikováno v:
Journal of Geophysical Research. 71:3677-3686
It is now generally agreed that the maximum probability of observing the radio aurora with a backscatter radar is obtained when the line of sight is orthogonal to the earth's magnetic field in the echo region. Significant but small departures from th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31940f33c893506ce4da56b199c5b93a
https://doi.org/10.1029/jz071i015p03677
https://doi.org/10.1029/jz071i015p03677
Publikováno v:
New Zealand Journal of Geology and Geophysics. 5:939-942
Effects observed at the Auroral Station, Central Otago, at Bluff, and at Nandi, Fiji, are reported and briefly discussed. (auth)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b193b16233b69bba116bd33a6f214b1f
https://doi.org/10.1080/00288306.1962.10420044
https://doi.org/10.1080/00288306.1962.10420044
Autor:
R. S. Unwin
Publikováno v:
Journal of Geophysical Research. 63:501-506
New evidence is presented which shows that VHF radio echoes from auroral ionization are reflections from aspect-sensitive columns aligned with the earth's magnetic field. Previous experimental data, interpreted in terms of a distribution of ionizatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b4fad71a0482a24a400259e5ff0f2a85
https://doi.org/10.1029/jz063i003p00501
https://doi.org/10.1029/jz063i003p00501
Publikováno v:
Journal of Geophysical Research. 76:7778-7786
Correlation of several magnetoionospheric wave and particle phenomena previously linked observationally to magnetospheric substorms and inferred to involve convection electric fields with whistler measurements of convection activity during two relati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d147b273a6f9f677faf42544f90eb40d
https://doi.org/10.1029/ja076i031p07778
https://doi.org/10.1029/ja076i031p07778
Autor:
M. Gadsden, R. S. Unwin
Publikováno v:
Nature. 180:1469-1470
IT is now well known that excess ionization associated with the aurora in or near the E-layer is capable of reflecting very high frequency radio waves with sufficient intensity to be easily detectable on a conventional radar display. Various estimate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c895802693c8c1570d4ff769da1f3609
https://doi.org/10.1038/1801469a0
https://doi.org/10.1038/1801469a0
Autor:
R. S. Unwin
Publikováno v:
Nature. 183:1044-1045
A NUMBER of workers have reported systematic movement of very high-frequency radar echoes associated with auroral ionization. Bullough and Kaiser1 at Jodrell Bank in England interpreted their results as indicating a westward movement before 2100 hr.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::46613ccd6e175d9603e58120d00262c6
https://doi.org/10.1038/1831044a0
https://doi.org/10.1038/1831044a0