High Trace Velocity (HTV) infrasonic signals Possible origin.

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Presentation transcript:

High Trace Velocity (HTV) infrasonic signals Possible origin

Swedish-Finnish Infrasound Network

Locally Observed Meteor Events

HTV signal signature

HTV signal scalogram

Atmospheric vortices Stenflo, L.: Acoustic solitary vortices. Phys. Fluids, 30 (10), 3297, 1987.

Satellite weather images

Occurrence of HTV signals in Kiruna and Sodankylä

a sample from Kiruna

a sample from Sodankylä

Sodankylä-motion pictures

Intensity pattern on the ground

Intensity ellipse

Shape of the intensity ellipse for both samples 230x690 m 190x380 m

Some properties Carry a lot of acoustic energy (up to 40 W/m2*sec) Are visible on the meteorological radar

Kiruna infrasound and ESRANGE radar

ESRANGE radar

Similar phenomena? Certain forms of atmospheric turbulence Cold air vortex Some boundary layer phenomena? Martian dust-devils

Cold air vortex

Martian dust-devil

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