Parameters of internal gravity waves in the mesosphere-lower thermosphere region derived from meteor radar wind measurements

Abstract

Abstract.A procedure of revealing parameters of internal gravity waves from meteor radar wind measurements is presented. The method is based on dividing the measuring volume into different parts and, using wavelet analysis, calculating the phase progression of frequency peaks in the vertical and horizontal direction. Thus, the distribution of vertical and horizontal wavelengths and directions of IGW energy propagation, using meteor radar data, has been obtained. The method was applied to a 4-month data set obtained in July and August, 1998 and 1999. As expected, the majority of waves have been found to propagate upwards, although a considerable number seem to propagate downwards as well. High-frequency (intrinsic periods T* of less than 2 h) waves are dominating. The distribution of waves over the course of an average day is only weakly structured, with weak maxima in the morning and evening.

Solar eclipse of the 29 March 2006: Results of the optical measurements by MORTI over Almaty (43.03°N, 76.58°E)

“…) gives approximately the same results as the COPHASE technique (not shown here). Our results are generally in agreement with the those reported by Zhang et al (1993a, b) and Oleynikov et al (2005). Nevertheless, results of the LS periodogram and COPHASE analysis in conjunction with the theory (Hines and Tarasick, 1994) cannot be fully explained by the dispersion relationship (Liu and Swenson, 2003) and are subject for future analysis and discussion.…”

Seasonal variation of space–time parameters of internal gravity waves at Kharkiv (49°30′N, 36°51′E)

“…Due to the operational design only zonal wind velocities can be derived, this has to be taken into account when interpreting the data. A discussion of this problem can be found in Oleynikov et al (2005).…”

“…Parameters of IGWs such as horizontal wavelength have not been available from typical meteor radars. Recently, however, Oleynikov et al (2005) have proposed a method to derive detailed IGW information from a meteor radar operated near Kharkiv, Ukraine. They presented results based on measurements obtained during a summer campaign in 1998.…”

“…The analysis presented in Oleynikov et al (2005) can determine the amplitude, period, horizontal and vertical phase velocity and horizontal and vertical wavelengths of IGWs. The parameters of individual IGWs were calculated for the interval JanuaryDecember 1987 and monthly averages were taken.…”

Derivation of horizontal and vertical wavelengths using a scanning OH(3-1) airglow spectrometer

“…While lidar 5 measurements, for example, allow the derivation of vertical wavelengths (see, e.g., Rauthe et al, 2006Rauthe et al, , 2008Mzé et al, 2014), horizontal wavelengths of larger-scale gravity waves can be investigated by meteor radars (Oleynikov et al, 2005(Oleynikov et al, , 2007. Airglow imaging can be used for the analysis of horizontal wavelengths of shorter-scale waves.…”