The Norwegian Fireball of June 7th, 2006
Short Range Infrasound
As the closest infrasonic (sub-acoustic frequencies <20 Hz) instruments to the event the airwaves produced by the fireball were particularly strong. At the closest station Kiruna the signal is so large in amplitude that it saturated the instrument and so the initial part of the observation is clipped. The same is the case for the largest amplitude portions at Jamton and Lycksele as well. Three distinct pulses are clearly visible as they propagate across the length of
Beamforming Azimuths (degrees measured East from North)
45 deg. (clipped portion of signal)
23.9 – 31.7 deg (unclipped portion of signal)
1.74 – 353.6 deg.
14.63 – 17.93 deg.
9.1 – 9.97 deg.