Zobrazeno 1 - 10
of 47
pro vyhledávání: '"N. F. Arnold"'
Publikováno v:
Advances in Geosciences, Vol 13, Pp 37-43 (2008)
We present an order of magnitude estimate of the impact of sprites and other transient luminous events (TLEs) on the atmospheric temperature via ozone changes. To address the effects of expected TLE-ozone changes of at most a few percent, we first st
Externí odkaz:
https://doaj.org/article/834819856a834ad1918848f5f851e0c6
Publikováno v:
Annales Geophysicae, Vol 22, Pp 4049-4059 (2004)
Polar mesosphere summer echoes (PMSEs) have been well studied using vertical incidence VHF radars at northern high-latitudes. In this paper, two PMSE events detected with the oblique incidence SuperDARN HF radars at Hankasalmi, Finland (62.3° N)
Externí odkaz:
https://doaj.org/article/c495430ceb9447deb974290b60e07bae
Publikováno v:
Annales Geophysicae, Vol 21, Pp 2073-2082 (2003)
The SuperDARN chain of oblique HF radars has provided an opportunity to generate a unique climatology of horizontal winds near the mesopause at a number of high latitude locations, via the Doppler shifted echoes from sources of ionisation in th
Externí odkaz:
https://doaj.org/article/de4a83e42fb04b0680960dcd25ad7e36
Publikováno v:
Annales Geophysicae, Vol 21, Pp 1047-1055 (2003)
Peculiar near range echoes observed in summer with the SuperDARN HF radar in Finland are presented. The echoes were detected at four frequencies of 9, 11, 13 and 15 MHz at slant ranges of 105–250 km for about 100 min. Interferometer measureme
Externí odkaz:
https://doaj.org/article/e0909fad3a5c49b591da7cb14b92ae7a
Publikováno v:
Annales Geophysicae, Vol 20, Pp 225-235 (2002)
A new coupled middle atmosphere and thermosphere general circulation model has been developed, and some first results are presented. An investigation into the effects of the diurnal tide upon the mean composition, dynamics and energetics was ca
Externí odkaz:
https://doaj.org/article/c19dd76403b8419d903b08228e1f80e8
Publikováno v:
Annales Geophysicae, Vol 19, Pp 425-434 (2001)
The Doppler shifts of meteor echoes measured by the SuperDARN HF radar network have been used in several studies to observe neutral winds in the upper mesosphere and lower thermosphere region. In the absence of accurate height information for ind
Externí odkaz:
https://doaj.org/article/c0243e614d2f464a897734df808b6886
Publikováno v:
Annales Geophysicae, Vol 18, Pp 56-64 (2000)
Characteristic signatures are often observed in HF radar range-time-intensity plots when travelling ionospheric disturbances (TIDs) are present. These signatures, in particular the variation of the F-region skip distance, have been synthesised usi
Externí odkaz:
https://doaj.org/article/95c97daa65534f26be13602ae7a07219
Publikováno v:
Annales Geophysicae, Vol 16, Pp 1392-1399 (1998)
Quasi-periodic fluctuations in the returned ground-scatter power from the SuperDARN HF radars have been linked to the passage of medium-scale gravity waves. We have applied a technique that extracts the first radar range returns from the F-region
Externí odkaz:
https://doaj.org/article/02a6591397de46b387473766497cd765
Autor:
N. F. Arnold, T. R. Robinson
Publikováno v:
Annales Geophysicae, Vol 16, Pp 69-76 (1998)
Recent observations suggest that there may be a causal relationship between solar activity and the strength of the winter Northern Hemisphere circulation in the stratosphere. A three-dimensional model of the atmosphere between 10–140 km was deve
Externí odkaz:
https://doaj.org/article/341b4398947c40abb39440e17662a15d
Publikováno v:
Annales Geophysicae, Vol 21, Iss 4, Pp 1047-1055 (0000)
Annales Geophysicae, Vol 21, Pp 1047-1055 (2003)
Annales Geophysicae, Vol 21, Pp 1047-1055 (2003)
Peculiar near range echoes observed in summer with the SuperDARN HF radar in Finland are presented. The echoes were detected at four frequencies of 9, 11, 13 and 15 MHz at slant ranges of 105–250 km for about 100 min. Interferometer measurements in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::83773ccfda1912ded35de6a5b39893ef
https://www.ann-geophys.net/21/1047/2003/
https://www.ann-geophys.net/21/1047/2003/