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High Trace Velocity (HTV) infrasonic signals

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.

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High Trace Velocity (HTV) infrasonic signals

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  1. High Trace Velocity (HTV) infrasonic signals Possible origin

  2. Swedish-Finnish Infrasound Network

  3. Locally Observed Meteor Events

  4. HTV signal signature

  5. HTV signal scalogram

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

  7. 2007-06-24Satellite weather images

  8. 2007-06-24Occurrence of HTV signals in Kiruna and Sodankylä

  9. 2007-06-24a sample from Kiruna

  10. 2007-06-24a sample from Sodankylä

  11. 2007-06-24Sodankylä-motion pictures

  12. Intensity pattern on the ground

  13. Intensity ellipse

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

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

  16. 2006-05-12Kiruna infrasound and ESRANGE radar

  17. 2006-05-12ESRANGE radar

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

  19. Cold air vortex

  20. Martian dust-devil

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