Wavelet Techniques Applied to Lidar Signals in the Analysis of Middle Atmosphere Dynamics

1999 ◽  
Vol 6 (2) ◽  
pp. 94-104 ◽  
Author(s):  
F. Chane-Ming ◽  
F. Molinaro ◽  
J. Leveau
Keyword(s):  
Middle Atmosphere ◽  
Middle Atmosphere Dynamics ◽  
Wavelet Techniques

scholarly journals On the influence of neutral turbulence on ambipolar diffusivities deduced from meteor trail expansion

2002 ◽  
Vol 20 (11) ◽  
pp. 1857-1862 ◽  
Author(s):  
C. M. Hall
Keyword(s):  
Middle Atmosphere ◽  
Atmospheric Dynamics ◽  
Meteorology And Atmospheric Dynamics ◽  
Middle Atmosphere Dynamics ◽  
Radar Echoes ◽  
Meteor Trail ◽  
Meteor Trails

Abstract. By measuring fading times of radar echoes from underdense meteor trails, it is possible to deduce the ambipolar diffusivities of the ions responsible for these radar echoes. It could be anticipated that these diffusivities increase monotonically with height akin to neutral viscosity. In practice, this is not always the case. Here, we investigate the capability of neutral turbulence to affect the meteor trail diffusion rate.Key words. Meteorology and atmospheric dynamics (middle atmosphere dynamics; turbulence)

Middle atmosphere dynamics

1983 ◽  
Vol 21 (2) ◽  
pp. 283 ◽  
Author(s):  
Dennis L. Hartmann
Keyword(s):  
Middle Atmosphere ◽  
Middle Atmosphere Dynamics

scholarly journals A case study of mesospheric planetary waves observed over a three-radar network using empirical mode decomposition

2018 ◽  
Vol 36 (3) ◽  
pp. 925-936
Author(s):  
Pangaluru Kishore ◽  
Isabella Velicogna ◽  
Tyler C. Sutterley ◽  
Yara Mohajerani ◽  
Enrico Ciracì ◽  
...  
Keyword(s):  
Empirical Mode Decomposition ◽  
Middle Atmosphere ◽  
Planetary Waves ◽  
Wind Component ◽  
Medium Frequency ◽  
Equatorial Latitude ◽  
Atmospheric Sciences ◽  
Mode Decomposition ◽  
History Of Geophysics ◽  
Wavelet Techniques

Abstract. In this paper an attempt is made to study equatorial Kelvin waves using a network of three radars: Kototabang (0.204∘ S, 100.320∘ E) meteor radar, Pameungpeuk (7.646∘ S, 107.688∘ E) medium-frequency radar, and Pontianak (0.003∘ S, 109.367∘ E) medium-frequency radar. We have used the continuous data gathered from the three radars during April–May 2010. Empirical mode decomposition (EMD), Lomb–Scargle periodogram (LSP) analysis, and wavelet techniques are used to study the temporal and altitude structures of planetary waves. Here, we used a novel technique called EMD to extract the planetary waves from wind data. The planetary waves of ∼ 6.5 and ∼ 3.6 days periodicity are observed in all three radar stations with peak amplitudes of about 12 and 11 m s−1, respectively. The 3.6-day wave has an average vertical wavelength from the three radars of about 42 km. The 3.6- and 6.5-day planetary waves are particularly strong in the zonal wind component. We find that the two waves are present at the 84–94 km height region. The observed features of the 3.6- and 6.5-day waves at the three tropical-latitude stations show some correspondence with the results reported for the equatorial-latitude stations. Keywords. Electromagnetics (wave propagation) – history of geophysics (atmospheric sciences) – meteorology and atmospheric dynamics (middle atmosphere dynamics)

scholarly journals Unexpectedly small semidiurnal tidal wind amplitudes in the mid-latitudemesopause region during September 2002

2004 ◽  
Vol 22 (2) ◽  
pp. 701-704 ◽  
Author(s):  
D. Kürschner ◽  
Ch. Jacobi
Keyword(s):  
Phase Transition ◽  
Key Words ◽  
Central Europe ◽  
Annual Cycle ◽  
Middle Atmosphere ◽  
Atmospheric Dynamics ◽  
Mesopause Region ◽  
Meteorology And Atmospheric Dynamics ◽  
Middle Atmosphere Dynamics ◽  
Waves And Tides

Abstract. The mesopause region monthly mean winds and semidiurnal tidal amplitudes and phases over Central Europe have been measured at Collm Observatory since September 1982. The regular annual cycle of the semidiurnal tidal amplitudes show maximum values during late August and September. In contrast to that, in autumn 2002 no enhancement of the tidal amplitudes was measured, while the autumn tidal phase transition occurred unusually early. Key words. Meteorology and atmospheric dynamics (middle atmosphere dynamics; waves and tides; climatology)

scholarly journals Middle‐Atmosphere Dynamics Observed With a Portable Muon Detector

2019 ◽  
Vol 6 (10) ◽  
pp. 1865-1876 ◽  
Author(s):  
M. Tramontini ◽  
M. Rosas‐Carbajal ◽  
C. Nussbaum ◽  
D. Gibert ◽  
J. Marteau
Keyword(s):  
Middle Atmosphere ◽  
Muon Detector ◽  
Middle Atmosphere Dynamics
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