What question did this study set out to answer?

This research aims to analyze seasonal variability in infrasonic ambient noise and its implications for atmospheric investigations.

Evidence for Virtual Source‐Receiver Refractions in Cross Correlations of Infrasonic Ambient Noise

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Seasonal variability in source activity and atmospheric temperature indicates new probing methods for the stratosphere.

This research aims to analyze seasonal variability in infrasonic ambient noise and its implications for atmospheric investigations.
Analyzed 11 years of infrasonic ambient noise data
Utilized cross-correlation functions to obtain variable lag times
Applied beamforming and one-bit normalization techniques
Modeled infrasound propagation in both the troposphere and stratosphere
Identified significant seasonal variability in source activity
Detected abundant microbaroms and surf in the 0.1-2.0 Hz frequency band
Revealed virtual source-receiver refractions as a plausible cause for short lag times
Demonstrated potential new methodologies for probing the stratosphere

Evers et al. (2026) studied this question.

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