Infrasonic Observations of Some Atmospheric Phenomena Ludwik Liszka Swedish Institute of Space Physics, SE-901 87, Umeå, Sweden.

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Presentation transcript:

Infrasonic Observations of Some Atmospheric Phenomena Ludwik Liszka Swedish Institute of Space Physics, SE , Umeå, Sweden

The Swedish Infrasound Network

The Lidstrom-microphone

The Lidstrom-microphone: the frequency response

Wind noise reduction: wind barriers

Selection of the frequency window The choice of frequency range for the network was based on the discovery of the ”optimum detection window” around 2 Hz by Procunier & Sharp (1970)

Infrasonic chirps

Time scale and dilation no.

Infrasonic chirps

Possible association with sprites

Cross-wind propagation

Case study on May 13, 2003: Jamton

Case study on May 13, 2003: Lycksele

Positions of events (x)

Background noise during the events Lycksele shows on that particular date the lowest amplitude of the uncorrelated background of all SIN stations, only Pa (peak value). At Jämtön the corresponding amplitude is Pa.

Satellite image May 13, UT

Occurrence of chirps StationNumber of observed chirps Kiruna None Jamton114 Lycksele5 Uppsala2

Azimuth distribution of chirps observed in Jamton

Temporal distribution of chirps during

Solar activity (sunspot numbers)

Infrasonic signatures from thunderstorms

Thunderstorm cells on July 8, 2005 at 1424UT

High resolution analysis: angle-of-arrival and trace velocity

Geometry of the signal from a cloud-to- cloud discharge

High resolution analysis of a lightning signature: azimuth

High resolution analysis of a lightning signature: trace velocity

Wavelet spectrum of the signature

High resolution analysis of a lightning signature: trace velocity vs azimuth

Trace velocity and the temperature Elevation: E=cos -1 (C/ V p ). where C is the speed of sound and Vp is the trace velocity. C =  T where T is the temperature in degrees Kelvin

Thermistor masts

Temperature layers

Temperature waves

Temperature bursts

Horizontal extent: 75m separation

Dynamical properties

Summer atmosphere: thunderstorm related temperature waves Thermistor Measurements of Temperature Oscillations During the Arctic Summer: Potential Coupling Between Severe Convective Thunderstorms and the Surface Prandtl Layer A report by Ludwik Liszka and Douglas ReVelle at: s/256abs.php

An unidentified ”sawtooth” signature

Characterized by very high trace velocities Most likely not connected with human activities (a natural phenomenon) Indications of correlation across considerable distances

An unidentified ”sawtooth” signature

Conclusion An efficient tool to monitor processes resulting in a pressure transient/transients