What question did this study set out to answer?

To examine the characteristics, vertical structure, and seasonal variations of the quasi-two-day wave oscillation in the equatorial upper mesosphere and lower thermosphere.

June 20, 1993Journal of Geophysical Research Atmospheres

The quasi‐two‐day wave observed in the equatorial middle atmosphere

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Authors

THT. J. HarrisDefence Science and Technology Group RVR. A. VincentSt. Lawrence University

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Implication

Observational radar study reveals quasi-two-day oscillations in the equatorial middle atmosphere, indicating upward energy propagation via Rossby-gravity normal modes.

Key Points

To examine the characteristics, vertical structure, and seasonal variations of the quasi-two-day wave oscillation in the equatorial upper mesosphere and lower thermosphere.
Analyzed radar wind measurements collected at Christmas Island (2°N, 157°W) within the 80–100 km altitude region.
Applied power spectral analysis and complex demodulation techniques to characterize wave amplitude and frequency shifts across height and time.
The oscillation was prominent in the meridional wind component, reaching peak amplitudes up to 45 m s⁻¹ in January/February, accompanied by a period shift from near 50 hours in July/August to 48 hours in January/February.
Phase propagated downward with an estimated vertical wavelength of approximately 70 km, reflecting upward energy propagation consistent with the (3, 0) Rossby-gravity normal mode alongside secondary 16-hour and 44-hour oscillations.

Cite This Study

Harris et al. (1993) studied this question.

synapsesocial.com/papers/6a7dd4574d9a7e00d75ca26b https://doi.org/10.1029/93jd00380

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Implication

Observational radar study reveals quasi-two-day oscillations in the equatorial middle atmosphere, indicating upward energy propagation via Rossby-gravity normal modes.

The quasi‐two‐day wave observed in the equatorial middle atmosphere

Discussion

Member takes

Implication

Key Points

Cite This Study

The quasi‐two‐day wave observed in the equatorial middle atmosphere

Discussion

Member takes

Implication

Key Points

Cite This Study

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