Experimental Validation of a Technique to Estimate Vertical Wavelength Parameters From Gravity Wave Perturbations on Mesospheric Airglows

Anderson, David S.; Makela, J. J.; Kanwar, Uday

doi:10.1109/tgrs.2013.2257176

Cited by 4 publications

(2 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gabor filtering has often been used as a tool for feature extraction (see Andrews and Pollen [1979] and 10.1002/2016JA023228 Chen et al [2001] for example usages). A similar technique was used by Anderson et al [2014] for wave feature extraction in the mesosphere. A Gabor kernel is a Gaussian function modulated by a sinusoid.…”

Section: Methodsmentioning

confidence: 99%

Observation of tsunami‐generated ionospheric signatures over Hawaii caused by the 16 September 2015 Illapel earthquake

Grawe

Makela

2017

JGR Space Physics

Self Cite

View full text Add to dashboard Cite

Tsunamis generate internal gravity waves (IGWs) that propagate vertically into the atmosphere and can create detectable signatures in the ionosphere. These signatures have consistently been observed in the presence of a tsunami for over a decade in the total electron content and for over 5 years in the 630.0 nm airglow. Here we show perturbations appearing in filtered GPS‐derived total electron content (TEC) and 630.0 nm airglow above Hawaii during the passing of the tsunami induced by the 16 September 2015 earthquake in Illapel, Chile. We report measurements of IGW parameters from both observation methodologies using a combination of prior methods and a newly developed method that uses a Gabor filter bank. A previously developed geometric model that takes into account the assumed posture of tsunami‐induced IGWs in the geomagnetic field and the observation geometry is shown to predict fairly well the expected location of the observation in the sky. Results of the Gabor filtering technique are also compared to previously published results for the 11 March 2011 Tohoku event. An overall comparison between all of the tsunami‐induced signatures that have appeared in both the 630.0 nm airglow and TEC above Hawaii to date is provided.

show abstract

Section: Methodsmentioning

confidence: 99%

Observation of tsunami‐generated ionospheric signatures over Hawaii caused by the 16 September 2015 Illapel earthquake

Grawe

Makela

2017

JGR Space Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Using the technique discussed by Anderson et al (), the images were flat‐fielded to reduce inhomogeneous contribution at lower elevations due to van Rhijn effect and nonuniform sensitivity of the charge‐coupled device detector at different pixels. Next, we created an averaged image using the image data for the night and subtracted this mean image from each image to enhance the airglow features.…”

Section: Instrumentationmentioning

confidence: 99%

Rare Occurrence of Off‐Equatorial Edge Initiating and Equatorward Surging Plasma Depletions Observed in OI 630‐nm Imaging

Parihar

2019

JGR Space Physics

View full text Add to dashboard Cite

Usual depletions in the Northern Hemisphere form a tree fork junction feature near the south (i.e., toward the equator) in all-sky airglow images, and its branches surge toward the north (i.e., poleward). We report in this paper unusual airglow depletions in OI 630.0-nm imaging over India that surged equatorward and formed an inverted tree fork junction feature on 3 January 2011. Airglow images showed faint signatures of medium-scale traveling ionospheric disturbances in the beginning that were east-west aligned and propagated toward equator. Within 06 to 18 min of its passing, turbulent structures were noted in the field of view, and two depleted patches appeared out of low airglow background over the off-equatorial edge. The apex height of the associated geomagnetic flux tubes varied from~1,400 to 1,600 km. Later, these dark regions intensified and surged equatorward while drifting slowly toward west. While remaining almost steady, one of them further intensified and continued to surge equatorward. The second dark patch got linked up with another isolated depletion to form an elongated depleted feature. Next, the southern end of this attached feature surged equatorward. When two depletions were well formed, an inverted tree fork junction was noticeable. During this time, the equatorward motion of the equatorial ionization anomaly structure is also seen. To the best of our knowledge, this is the first imaging observation of an inverted tree fork junction feature and brings out the unknown facets of ionospheric irregularities.Plain Language Summary Usual depletions form a tree fork junction feature near the equatorial edge in all-sky airglow images; its branches surge poleward. On 3 January 2011, unusual depletions were noted over India that surged equatorward and formed an inverted tree fork junction. We present an independent usual depletion event. Such an inverted feature has been not reported earlier to the best of our knowledge and brings out the unknown facets of ionospheric irregularities.

show abstract

Remote sensing of venusian seismic activity with a small spacecraft, the VAMOS mission concept

Didion

Komjáthy

Sutin

et al. 2018

2018 IEEE Aerospace Conference

View full text Add to dashboard Cite

Experimental Validation of a Technique to Estimate Vertical Wavelength Parameters From Gravity Wave Perturbations on Mesospheric Airglows

Cited by 4 publications

References 32 publications

Observation of tsunami‐generated ionospheric signatures over Hawaii caused by the 16 September 2015 Illapel earthquake

Observation of tsunami‐generated ionospheric signatures over Hawaii caused by the 16 September 2015 Illapel earthquake

Rare Occurrence of Off‐Equatorial Edge Initiating and Equatorward Surging Plasma Depletions Observed in OI 630‐nm Imaging

Remote sensing of venusian seismic activity with a small spacecraft, the VAMOS mission concept

Contact Info

Product

Resources

About