Eastward-propagating planetary waves in the polar middle atmosphere

High-Frequency Planetary Waves in the Polar Middle Atmosphere as Seen in a Data Assimilation System

The 4-day wave often dominates the large-scale wind, temperature, and constituent variability in the highlatitude Southern Hemisphere winter near the stratopause. This study examines the winter Southern Hemisphere vortex of 1998 using 4-times-daily output from a data assimilation system to focus on the polar 2-day, wavenumber-2 component of the 4-day wave. The data assimilation system products ...

An ozone-modified refractive index for vertically propagating planetary waves

[1] An ozone-modified refractive index (OMRI) is derived for vertically propagating planetary waves using a mechanistic model that couples quasigeostrophic potential vorticity and ozone volume mixing ratio. The OMRI clarifies how wave-induced heating due to ozone photochemistry, ozone transport, and Newtonian cooling (NC) combine to affect wave propagation, attenuation, and drag on the zonal me...

Physical Simulation of Baroclinic Waves and Vortices in the Atmosphere

On the statistical detection of propagating waves in polar coronal holes

Context. Waves are important to the study of dynamical processes in coronal holes and the acceleration of the fast solar wind. A spectral time series was taken with the SUMER spectrometer on-board SoHO on 20 October 1996. The observations were obtained in the N iv 765 Å transition region line and the Ne viii 770 Å line of the low corona. Aims. We detect the presence of waves and study their cha...

On the statistical detection of propagating waves in polar coronal hole

Waves are important for the heating of the solar corona and the acceleration of the solar wind. We have examined a long spectral time series of a southern coronal hole observed on the 25th February 1997, with the SUMER spectrometer on-board SoHO. The observations were obtained in a transition region N iv 765 Å line and in a low coronal Ne viii 770 Å line. Our observations indicate the presence ...