Space Geophysics Determination of gravity waves parameters in the airglow combining photometer and imager data Prosper Kwamla Nyassor | April 25, 2018 NATIONAL INSTITUTE OF SPACE RESEARCH www.inpe.br INPE - National Institute of Space Research - Space and Atmospheric Science Division
Overview Introduction 1 Brief Introduction Objectives 2 Instrumentation and Observation Methodology and Data Analysis 3 Results and Discussions 4 Results and discussion of 14/10/2006 Analysis Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 2/22 Prosper Kwamla Nyassor – Space Geophysics
Introduction Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 3/22 Prosper Kwamla Nyassor – Space Geophysics
Brief Introduction Figure: Components of propagating gravity waves. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 4/22 Prosper Kwamla Nyassor – Space Geophysics
Objectives To determine the: Periodicity 1 Amplitude and phase 2 Propagation direction 3 Horizontal wavelength 4 Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 5/22 Prosper Kwamla Nyassor – Space Geophysics
Instrumentation and Observation Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 6/22 Prosper Kwamla Nyassor – Space Geophysics
Instrumentation The instruments used for the present study are; a photometer (Multi-3), an all sky imager and a meteor radar. All these instrument are located at Figure: Geographical location of S˜ ao Jo˜ ao do Cariri. instruments Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 7/22 Prosper Kwamla Nyassor – Space Geophysics
Observation A total number of 1051 dataset from 2001 - 2007 was obtained. 1 A period of 13 nights per month centered on the time of new moon. 2 8 hours of observation time. 3 OI 5577, O 2 , NaD and OH emission layers were used. 4 Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 8/22 Prosper Kwamla Nyassor – Space Geophysics
Methodology and Data Analysis Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 9/22 Prosper Kwamla Nyassor – Space Geophysics
Methodology and Data Analysis Photometer Meteor Radar All-Sky Image Time Series Wind Data Data Treatment Data Treatment Keogram Wind Velocity Spectral Analysis Analysis Dispersion Relation Figure: Methodology Flowchart. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 10/22 Prosper Kwamla Nyassor – Space Geophysics
Figure: The summary of data observation and data analysis. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 11/22 Prosper Kwamla Nyassor – Space Geophysics
Results and Discussions Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 12/22 Prosper Kwamla Nyassor – Space Geophysics
Period of Propagation Figure: (a) Lomb-Scargle periodogram and (b) Wavelet Spectrogram for 14/10/2006 observed photometer data. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 13/22 Prosper Kwamla Nyassor – Space Geophysics
Residual & Reconstructed Waves Figure: The superposition of 14/10/2006 residual wave and the reconstructed wave with two harmonics. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 14/22 Prosper Kwamla Nyassor – Space Geophysics
Direction of Propagation Figure: Altitude versus phase shift plot for 14/10/2006. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 15/22 Prosper Kwamla Nyassor – Space Geophysics
Direction of Propagation Figure: Upward phase propagation of the two harmonics of 14/10/2006 observed wave. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 16/22 Prosper Kwamla Nyassor – Space Geophysics
Keogram of 14/10/2006 Image Figure: Keogram of 14/10/2006 all sky image. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 17/22 Prosper Kwamla Nyassor – Space Geophysics
Keogram Analysis of 14/10/2006 Image Figure: Keogram analysis of 14/10/2006 all sky image. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 18/22 Prosper Kwamla Nyassor – Space Geophysics
N k H = k x + ky U H = U x + U y β α = 26 . 2 ◦ 26 . 6 ◦ W E S Figure: Vector diagram of the wave with respect to the background wind. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 19/22 Prosper Kwamla Nyassor – Space Geophysics
Comparison between Keogram analysis and Dispersion relation Period ( τ ) Horizontal Wavelength ( λ H ) Keogram Analysis 33.3 ± 1.70 min 185.8 ± 10.9 km Dispersion Relation 38.0 ± 1.90 min 195.9 ± 9.80 km Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 20/22 Prosper Kwamla Nyassor – Space Geophysics
Conclusion Simultaneous observation of similar gravity waves periods within three emission layers in the photometer data suggests a vertical propagation of the same gravity wave. The horizontal wavelength obtained from keogram analysis and dispersion relation agree reasonably, hence suggesting that the same wave was observed in the photometer and all-sky imager. An upward phase propagating wave was observed. Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 21/22 Prosper Kwamla Nyassor – Space Geophysics
Acknowledgement Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions April 25, 2018 22/22 Prosper Kwamla Nyassor – Space Geophysics
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