Zobrazeno 1 - 10
of 1 298
pro vyhledávání: '"U. Blum"'
Autor:
S. Lossow, M. Khaplanov, J. Gumbel, J. Stegman, G. Witt, P. Dalin, S. Kirkwood, F. J. Schmidlin, K. H. Fricke, U. Blum
Publikováno v:
Atmospheric Chemistry and Physics, Vol 9, Iss 13, Pp 4407-4417 (2009)
The Hygrosonde-2 campaign took place on 16 December 2001 at Esrange/Sweden (68° N, 21° E) with the aim to investigate the small scale distribution of water vapour in the middle atmosphere in the vicinity of the Arctic polar vortex. In situ balloon
Externí odkaz:
https://doaj.org/article/e527df0780b3481f967ed4570d0845ca
Autor:
H. Nesse, D. Heinrich, B. Williams, U.-P. Hoppe, J. Stadsnes, M. Rietveld, W. Singer, U. Blum, M. I. Sandanger, E. Trondsen
Publikováno v:
Annales Geophysicae, Vol 26, Pp 1071-1081 (2008)
Several possible mechanisms for the production of sporadic sodium layers have been discussed in the literature, but none of them seem to explain all the accumulated observations. The hypotheses range from direct meteoric input, to energetic electr
Externí odkaz:
https://doaj.org/article/86cf5f2f753945309d474de4562bc849
Publikováno v:
Annales Geophysicae, Vol 26, Pp 1057-1069 (2008)
We present summer Na-densities and atmospheric temperatures measured 80 to 110 km above the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR). The Weber Na Lidar is part of ALOMAR, located at 69° N in Norway, 150 km north of the Ar
Externí odkaz:
https://doaj.org/article/339ad4092f8c462f85af77f033b28c16
Autor:
M. Ridolfi, U. Blum, B. Carli, V. Catoire, S. Ceccherini, H. Claude, C. De Clercq, K. H. Fricke, F. Friedl-Vallon, M. Iarlori, P. Keckhut, B. Kerridge, J.-C. Lambert, Y. J. Meijer, L. Mona, H. Oelhaf, G. Pappalardo, M. Pirre, V. Rizi, C. Robert, D. Swart, T. von Clarmann, A. Waterfall, G. Wetzel
Publikováno v:
Atmospheric Chemistry and Physics, Vol 7, Iss 16, Pp 4459-4487 (2007)
The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) has been operating since March 2002 onboard of the ENVIronmental SATellite of the European Space Agency (ESA). The high resolution (0.035 cm−1 full width half maximum, unapodized
Externí odkaz:
https://doaj.org/article/e3119a9ec5e34376848376b7cc3c2677
Publikováno v:
Annales Geophysicae, Vol 24, Pp 1209-1226 (2006)
Falling sphere and balloon wind and temperature data from the MaCWAVE winter campaign, which was conducted in northern Scandinavia during January 2003, are analyzed to investigate gravity wave characteristics in the stratosphere and mesosphere. Th
Externí odkaz:
https://doaj.org/article/61f433e385714a02946e6cf904e641f3
Autor:
S. Kirkwood, E. Belova, U. Blum, C. Croskey, P. Dalin, K.-H. Fricke, R. A. Goldberg, J. Manninen, J. D. Mitchell, F. Schmidlin
Publikováno v:
Annales Geophysicae, Vol 24, Pp 1245-1255 (2006)
During the MaCWAVE winter campaign in January 2003, layers of enhanced echo power known as PMWE (Polar Mesosphere Winter Echoes) were detected by the ESRAD 52 MHz radar on several occasions. The cause of these echoes is unclear and here we use obs
Externí odkaz:
https://doaj.org/article/d28a61ead2864ad6834047ab6b8a5181
Autor:
R. A. Goldberg, D. C. Fritts, F. J. Schmidlin, B. P. Williams, C. L. Croskey, J. D. Mitchell, M. Friedrich, J. M. Russell III, U. Blum, K. H. Fricke
Publikováno v:
Annales Geophysicae, Vol 24, Pp 1159-1173 (2006)
MaCWAVE (Mountain and Convective Waves Ascending VErtically) was a highly coordinated rocket, ground-based, and satellite program designed to address gravity wave forcing of the mesosphere and lower thermosphere (MLT). The MaCWAVE program was con
Externí odkaz:
https://doaj.org/article/e17887a91ca44b64b297c878df28d077
Publikováno v:
Annales Geophysicae, Vol 24, Pp 1189-1197 (2006)
The atmosphere background wind field controls the propagation of gravity waves from the troposphere through the stratosphere into the mesosphere. During January 2003 the MaCWAVE campaign took place at Esrange, with the purpose of observing vertica
Externí odkaz:
https://doaj.org/article/41c65e0f9e24491e9d44d2f83e1221d7
Autor:
U. Blum, K. H. Fricke
Publikováno v:
Annales Geophysicae, Vol 23, Pp 1645-1658 (2005)
The Bonn University operates a Rayleigh/Mie/Raman backscatter lidar at the Esrange near the Swedish city of Kiruna, north of the Arctic circle. The lidar system covers the atmosphere from about 4 km to 100 km altitude and it is capable of measurin
Externí odkaz:
https://doaj.org/article/cd19254a9c784572bd46b65299e2dd2e
Publikováno v:
Atmospheric Chemistry and Physics, Vol 4, Iss 3, Pp 809-816 (2004)
Atmospheric gravity waves have been the subject of intense research for several decades because of their extensive effects on the atmospheric circulation and the temperature structure. The U. Bonn lidar at the Esrange and the ALOMAR RMR lidar at the
Externí odkaz:
https://doaj.org/article/4d7c432b31eb48b487943d33aedfb2fa