Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa23a1779n&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA23A-1779
Physics
[0310] Atmospheric Composition And Structure / Airglow And Aurora, [3369] Atmospheric Processes / Thermospheric Dynamics, [3384] Atmospheric Processes / Acoustic-Gravity Waves
Scientific paper
In this paper, we discuss the excitation of acoustic and atmospheric gravity waves (GWs) by a fireball meteor observed in the Na airglow layer at Syowa Station in the Antartica. We show that these waves can be identified in the data using spectral filtering methods even though the auroral contamination was significant at the time. We find that "bow"-wave type fronts are observed. We analyze the data and identify the wavelengths and phase speeds. We then compute the acoustic and GWs excited by the heatings and forcings that are expected to occur in the MLT from this meteor using the intensity profile observed by a concurrent all-sky television camera. We find that the resulting GW pattern is related to the fireball angle from the vertical and to the altitude of energy deposition (above or below the Na layer). We find that the model can reproduce the observed GW characteristics reasonably well.
Nakamura Takashi
Suzuki Hiroshi
Vadas Sharon L.
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