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Using NASA AWE Observations to Investigate the Global Distribution of Concentric Gravity Waves


Using NASA AWE Observations to Investigate the Global Distribution of Concentric Gravity Waves

Upward propagating atmospheric gravity waves (GWs) originating from various lower atmosphere sources can transport energy and momentum into the Earth's upper atmosphere. In the ionosphere, GWs produce traveling ionospheric disturbances (TIDs), generate electric fields, and appear to contribute to the seeding of equatorial plasma bubbles that have detrimental effects on navigation, communication, and surveillance systems. Despite their importance and decades of research there are still many open questions regarding the morphology and dynamics of gravity waves. Of particular interest are concentric gravity waves (CGWs), as they are the direct result of the coupling between lower and upper atmosphere . For this study, we used observations from the recently launched NASA AWE mission that observes GWs near 87 km altitude to study the global distribution of CGWs at this altitude and investigate their temporal/seasonal evolution. From these observations, 115 CGW events were identified over 43 days between November 2023 and January 2024. Through comparisons of our AWE results with those obtained from other satellite missions, we found many similarity between the distribution of CGW events identified at the 87 km AWE-altitude and those found in the stratosphere below and those observed in the O-band at 95 km above.

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