Space Geophysics Determination of gravity waves parameters in the - - PowerPoint PPT Presentation

NATIONAL INSTITUTE OF SPACE RESEARCH

Space Geophysics

Determination of gravity waves parameters in the airglow combining photometer and imager data Prosper Kwamla Nyassor | April 25, 2018

INPE - National Institute of Space Research - Space and Atmospheric Science Division

www.inpe.br

Overview

1

Introduction Brief Introduction Objectives

2

Instrumentation and Observation

3

Methodology and Data Analysis

4

Results and Discussions Results and discussion of 14/10/2006 Analysis

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 2/22

Introduction

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 3/22

Brief Introduction

Figure: Components of propagating gravity waves.

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 4/22

Objectives

To determine the:

1

Periodicity

2

Amplitude and phase

3

Propagation direction

4

Horizontal wavelength

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 5/22

Instrumentation and Observation

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 6/22

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 S˜ ao Jo˜ ao do Cariri.

Figure: Geographical location of instruments

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 7/22

Observation

1

A total number of 1051 dataset from 2001 - 2007 was obtained.

2

A period of 13 nights per month centered on the time of new moon.

3

8 hours of observation time.

4

OI 5577, O2, NaD and OH emission layers were used.

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 8/22

Methodology and Data Analysis

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 9/22

Methodology and Data Analysis

All-Sky Image Photometer Time Series Meteor Radar Wind Data Data Treatment Keogram Analysis Dispersion Relation Data Treatment Spectral Analysis Wind Velocity

Figure: Methodology Flowchart.

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 10/22

Figure: The summary of data observation and data analysis.

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 11/22

Results and Discussions

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 12/22

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 Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 13/22

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 Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 14/22

Direction of Propagation

Figure: Altitude versus phase shift plot for 14/10/2006.

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 15/22

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 Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 16/22

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 Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 17/22

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 Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 18/22

W E S N kH = kx + ky 26.6◦

α = 26.2◦ β

UH = Ux + Uy

Figure: Vector diagram of the wave with respect to the background wind.

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 19/22

Comparison between Keogram analysis and Dispersion relation

Period (τ) Horizontal Wavelength (λH) 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 Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 20/22

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 Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 21/22

Acknowledgement

Introduction Instrumentation and Observation Methodology and Data Analysis Results and Discussions Prosper Kwamla Nyassor – Space Geophysics April 25, 2018 22/22