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  • 1
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    VHF Radar Observations in the Stratosphere and Mesosphere During a Stratospheric Warming (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The SOUSY-VHF-radar was used to carry out measurements during minor and a major stratospheric warming in February and March 1980, respectively. Echoes have been received from the stratosphere up to an altitude of about 30 km continuously during day and night, whereas echoes from the mesosphere were restricted to the daytime and occurred sporadically at different heights within the altitude range from 60 to 90 km. The three dimensional velocity vector was derived from Doppler measurements made in three different antenna beam directions with a height resolution of 1.5 km. In particular, the results obtained during disturbed conditions show the change of the zonal winds at mesospheric heights from westerly to easterly. A spectral analysis reveals a diurnal and a weaker semidiurnal tide of the zonal wind component.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 10; p 96
    Format: application/pdf
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  • 2
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    VHF radar measurements over Andoya (Northern Norway) (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Mobile SOUSY Radar was operated during the MAP/WINE, the MAC/SINE, and MAC/Epsilon campaigns at Andoya in Northern Norway. A comparison between summer and winter results is presented, in particular the generation and development of the scattering regions, the different power spectral densities and the aspect sensitivities which were derived from six different beam directions.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions, Middle Atmosphere Program. Handbook for MAP, volume 27; p 365-369
    Format: application/pdf
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  • 3
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    VHF radar measurements in the summer polar mesosphere (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Measurements in the mesosphere over Andoya/Norway (69 N, 16 E) were carried out using the mobile SOUSY-VHF radar with an extended beam configuration during the MAC/SINE campaign in summer 1987. First results of a 48 h and a 3 h observational period for heights between about 83 and 91 km are presented. Zonal mean winds are characterized by a strong westward flow of up to 50/ms, whereas the equatorward directed meridional component is weaker. The dominating semidiurnal tide has amplitudes up to 30/ms and a vertical wavelength of about 55 km. The diurnal tide is less pronounced. The total upward flux of horizontal momentum takes values of -2 sq m/sq s near 84 km and increases with increasing height, reaching a maximum value of 22 sq m/sqs for both the zonal and meridional components. However, measurements of the horizontal isotropy of the wave field suggest significant anisotropy. The major contribution to the momentum flux is from the 10 min to 1 h period range below about 87 km, and from the 1 to 6 h period range above this height.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions, Middle Atmosphere Program. Handbook for MAP, volume 27; p 359-364
    Format: application/pdf
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  • 4
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    Consistency of rocket and radar electron density observations - Implications about the anisotropy of mesospheric turbulence (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Quantitative comparisons are made between rocketborne measurements of electron density fluctuations and simultaneous 53.5 MHz radar measurements obtained during the Summer in Northern Europe campaign. Rocketborne radar reflectivity results are of the order of 10 dB greater than would be expected in the case of isotropic electron density fluctuations. There results can be reconciled by assuming isotropic turbulence. A relation is derived between rocket and radar observations which covers the entire range from isotropic turbulent scatter to Fresnel scatter at horizontal density stratifications. The anisotropy is greatest at heights where the electron density displays deep 'bite-outs'.
    Keywords: GEOPHYSICS
    Type: Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169); 52; 855-873
    Format: text
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