Search Results - "Zahn, U"

Icy particles in the summer mesopause region: Three-dimensional modeling of their environment and two-dimensional modeling of their transport by Berger, U., von Zahn, U.

“…In summertime, layers of icy particles form in the high‐latitude mesopause region, causing the phenomena of noctilucent clouds and polar mesosphere summer…”
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Persistent ice cloud in the midsummer upper mesosphere at high latitudes: Three-dimensional modeling and cloud interactions with ambient water vapor by von Zahn, U., Berger, U.

“…We infer from the observed occurrence frequency of polar mesosphere summer echoes and from the three‐dimensional (3‐D) modeling of conditions in the…”
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Regulation of Choline Acetyltransferase Expression by 17β-Oestradiol in NSC-34 Cells and in the Spinal Cord by Johann, S., Dahm, M., Kipp, M., Zahn, U., Beyer, C.

“…Motoneurones located in the ventral horn of the spinal cord conciliate cholinergic innervation of skeletal muscles. These neurones appear to be exceedingly…”
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Helium in Jupiter's atmosphere: Results from the Galileo probe Helium Interferometer Experiment by Zahn, U., Hunten, D. M., Lehmacher, G.

“…On December 7, 1995, the NASA Galileo probe provided the first in situ measurements of the helium abundance in the atmosphere of Jupiter. Our Jamin…”
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Diurnal and annual variations of meteor rates at the arctic circle by Singer, W., von Zahn, U., Weiß, J.

“…Meteors are an important source for (a) the metal atoms of the upper atmosphere metal layers and (b) for condensation nuclei, the existence of which are a…”
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Size distributions of NLC particles as determined from 3-color observations of NLC by ground-based lidar by von Cossart, G., Fiedler, J., von Zahn, U.

“…From June to August 1998 the ALOMAR Rayleigh/Mie/Raman lidar, located at 69°N and 16°E in Northern Norway, repeatedly observed noctilucent clouds (NLCs)…”
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The two-level structure of the mesopause: A model study by Berger, U., Zahn, U.

“…Recent global‐scale observations of the mesopause thermal structure show the altitude of the mesopause to be located regularly near 100 km and in a small…”
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Concept of a two-level mesopause: Support through new lidar observations by She, C. Y., Zahn, U.

“…Regular Doppler temperature lidar measurements at Fort Collins, United States (41°N, 105°W), and Kühlungsborn, Germany (54°N, 12°E), during 1996/1997 have…”
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Atmospheric Ca and Ca+ layers: Midlatitude observations and modeling by Gerding, M., Alpers, M., Zahn, U., Rollason, R. J., Plane, J. M. C.

“…We report on a comprehensive set of observations of the upper atmospheric Ca and Ca+ layers. The observations were obtained by ground‐based lidars at…”
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Simultaneous and common-volume observations of noctilucent clouds and polar mesosphere summer echoes by von Zahn, U., Bremer, J.

“…Joint operations of the ALOMAR Rayleigh/Mie/Raman (RMR) lidar and ALOMAR SOUSY radar (located at 69°N latitude) let us obtain a first series of simultaneous…”
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Noctilucent clouds and the mesospheric water vapour: the past decade by von Zahn, U., Baumgarten, G., Berger, U., Fiedler, J., Hartogh, P.

“…The topic of this paper is the sensitivity of the brightness of noctilucent clouds (NLC) on the ambient water vapour mixing ratio f(H2O). Firstly, we use…”
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The ALOMAR Rayleigh/Mie/Raman lidar : objectives, configuration, and performance by VON ZAHN, U, VON COSSART, G, FIEDLER, J, FRICKE, K. H, NELKE, G, BAUMGARTEN, G, REES, D, HAUCHECORNE, A, ADOLFSEN, K

“…We report on the development and current capabilities of the ALOMAR Rayleigh/Mie/Raman lidar. This instrument is one of the core instruments of the…”
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NLC particle properties from a five-color lidar observation at 54°N by Alpers, M., Gerding, M., Höffner, J., Zahn, U.

“…On June 13/14, 1998, a first simultaneous five‐color lidar measurement of a noctilucent cloud was realized. The experiment was made possible by the fact that…”
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Tidal variations of noctilucent clouds measured at 69°N latitude by groundbased lidar by von Zahn, U., von Cossart, G., Fiedler, J., Rees, D.

“…During June/July 1997 we observed with a groundbased lidar noctilucent clouds (NLCs) overhead the ALOMAR observatory in Northern Norway (69°N, 16°E). These…”
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The potassium density and temperature structure in the mesopause region (80–105 km) at a low latitude (28°N) by Fricke-Begemann, C., Höffner, J., von Zahn, U.

“…By means of a groundbased lidar we have measured potassium layer parameters and the temperature structure in the mesopause region during 55 nights in 1999 at…”
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The Helium Mass Fraction in Jupiter's Atmosphere by von Zahn, U., Hunten, D. M.

“…On 7 December 1995, the NASA Galileo probe provided in situ measurements of the helium abundance in the atmosphere of Jupiter. A Jamin interferometer measured…”
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Aircraft lidar observations of an enhanced type Ia polar stratospheric clouds during APE-POLECAT by Tsias, A., Wirth, M., Carslaw, K. S., Biele, J., Mehrtens, H., Reichardt, J., Wedekind, C., Weiß, V., Renger, W., Neuber, R., Zahn, U., Stein, B., Santacesaria, V., Stefanutti, L., Fierli, F., Bacmeister, J., Peter, T.

“…Polar stratospheric clouds (PSCs) which do not fit into the standard type Ia/Ib scheme were measured by the airborne lidar OLEX (Ozone Lidar Experiment) on…”
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Iron, calcium, and potassium atom densities in the trails of Leonids and other meteors: Strong evidence for differential ablation by von ZAHN, U., GERDING, M., HÖFFNER, J., McNEIL, W. J., MURAD, Edmond

“…— We report on studies of the Fe, Ca, and K atom densities in the trails of meteors. The measurements of the densities were taken simultaneously and in a…”
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Impact of breast ultrasound screening in gynecological practice by Madjar, H, Becker, S, Doubek, K, Horchler, T, Mendoza, M, Moisidis-Tesch, C, Näther, B, Niebling, K, Pröls, U, Schardt, A-R, Ulrich, S, Zahn, U

“…To define the value of whole breast ultrasound for breast cancer detection in primary women's health care in gynecological routing practice. Among women who…”
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Simultaneous K and Ca lidar observations during a meteor shower on March 6-7, 1997, at Kühlungsborn, Germany by Gerding, M., Alpers, M., Höffner, J., Zahn, U.

“…We report about observations of meteor trails by ground‐based lidars which were obtained with two metal resonance lidars monitoring simultaneously the same air…”
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