Skip to main content
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Atmospheric resonances and their coupling to vibrations of the ground and waves in the ocean

Fig. 1

Vertical displacements in a mid-latitude atmosphere due to vibrations of its lower boundary. a Displacement amplitude, |w|, at altitude z = 180 km in a wave with trace velocity V = 3000 m/s. Atmospheric resonances manifest as peaks of the displacement’s frequency dependence. b Variation with altitude of the amplitude of the reduced vertical displacement Q, Eq. (23), at frequencies of the first three atmospheric resonances. c Variation of the resonance frequency and quality factor of acoustic resonances with the trace velocity of excitation. Color shows displacement amplitude at z = 180 km. The red line is the WKB predictions for the frequency of the first acoustic resonance and is obtained from Eq. (10). Monochromatic ground-level displacements and summer conditions over Wallops Island (Virginia, USA) are assumed in all simulations. The displacement and reduced displacement amplitudes are normalized by their values at z = 0 and are dimensionless. Resonance orders n = 1, 2, 3 are indicated in all figures

Back to article page