Observations of autumnal Hydroxyl-Airglow focusing on the 2006 Leonid and Geminid meteroid showers
Abstract
Airglow measurements were performed simultaneously with the two scanning grating spectrometers (GRIPS 3, GRIPS 4) at the German environmental research station "Schneefernerhaus". The station is located at 2670 m height on the mountain Zugspitze (47.4° N, 11° E) in the northern Alps. Both instruments recorded the OH(3-1) transitions between 1.52 µm and 1.55 µm during November/December 2006. Rotational temperatures and relative spectral intensities are calculated. The overall variability is discussed and power spectra of temperature and intensity fluctuations are calculated applying the Harmonic Analysis and Maximum Entropy Method. During the Geminid shower a distinguished increase in intensity is recorded. Superimposed on this increased intensity an enhancement of short periodic fluctuations is observed. Dominant spectral features thereof are identified, quantified and differences between the two meteoroid showers are discussed. The findings are tentatively interpreted as being, at least partly, due to meteoroid activity. However, a certain impact of dynamical fluctuations, as for example infrasonic waves in the short periodic range and tides in the long periodic range cannot be entirely excluded.
- Publication:
-
37th COSPAR Scientific Assembly
- Pub Date:
- 2008
- Bibcode:
- 2008cosp...37.2776S