Results 61 to 70 of about 829,957 (291)

On the modelling of stationary planetary waves [PDF]

Atmosphere, 1976
Abstract The structure of the atmospheric stationary planetary waves is obtained by means of the quasi‐geostrophic linear model developed by Matsuno (1 970). To show the influence of the upper boundary condition on the structure of the waves, the latter is computed using a rigid top and a radiation condition.
Christiane Beaudoin, Jacques Derome
openaire   +1 more source

Micromachined Double‐Membrane Mechanically Tunable Metamaterial for Thermal Infrared Filtering

Advanced Photonics Research, Volume 6, Issue 5, May 2025.
Herein, a mechanically tunable double‐layer plasmonic metamaterial leveraging the extraordinary optical transmission effect observed in subwavelength arrays of openings within thin metal layers is presented. The concept is experimentally validated by integrating the proposed metamaterial structure into an electrostatic parallel‐plate actuator to create
Oleg Bannik, Fedor Kovalev, Mingkai Liu, Michal Zawierta, Dilusha Silva, Lorenzo Faraone, Mariusz Martyniuk, Ilya Shadrivov   +7 more
wiley   +1 more source

Signature of Two‐Step Non‐Linear Interactions Associated to Zonally Symmetric Waves During Major Sudden Stratospheric Warmings

Geophysical Research Letters, 2023
Atmospheric tides and associated dynamics during two major boreal sudden stratospheric warmings (SSWs) have been investigated. The evolutionary Lomb Scargle and wavelet spectral analysis of specular meteor radar (SMR)‐derived hourly winds reveal evidence
G. Mitra, A. Guharay, J. F. Conte, J. L. Chau   +3 more
doaj   +1 more source

Observational Evidence of Distinguishable Weather Patterns for Three Types of Sudden Stratospheric Warming During Northern Winter

Frontiers in Earth Science, 2021
Sudden stratospheric warming (SSW) events often lead to a cold surface air temperature anomaly over the extratropical regions. In this study, we propose, through observational evidence, that the types of SSW determine the severity of the cold anomaly ...
Hyesun Choi, Joo-Hong Kim, Baek-Min Kim, Seong-Joong Kim   +3 more
doaj   +1 more source

Nonlocomotory Robotic Strategies for Dynamic Rotation Control in Terrestrial Robots: A Review

Advanced Robotics Research, EarlyView.
Terrestrial robots increasingly require rapid body rotation to maintain stability and agility in complex environments. This review shows nonlocomotory rotational control strategies that operate without ground contact, including reaction wheels, tails, bars, limbs, and thrusters.
Y. Liang, J. An, X. Zheng, D. Wang, S. Wang, X. Wang, P. Zhu, J. Pei, S. Li, J. Paripurana, Y. Han, Z. Tang, X. Gan, Q. He, X. Ma   +14 more
wiley   +1 more source

Ultra-Low Frequency Waves of Foreshock Origin Upstream and Inside of the Magnetospheres of Earth, Mercury, and Saturn Related to Solar Wind–Magnetosphere Coupling

Universe
This review examines ultra-low frequency (ULF) waves across different planetary environments, focusing on Earth, Mercury, and Saturn. Data from spacecraft missions (CHAMP, Swarm, and Oersted for Earth; MESSENGER for Mercury; and Cassini for Saturn ...
Zsofia Bebesi, Navin Kumar Dwivedi, Arpad Kis, Antal Juhász, Balazs Heilig   +4 more
doaj   +1 more source

Persistence of the planetary wave type oscillations in foF2 over Europe [PDF]

Annales Geophysicae, 2003
Planetary waves are oscillations of very predominantly tropospheric origin with typical periods of about 2–30 days. Their dominant zonal wave numbers are 1, 2 and 3, i.e. the waves are of large-scale (global) character.
J. Laštovička, P. Križan, P. Šauli, D. Novotná   +3 more
doaj   +1 more source

Mid-Latitude Mesospheric Zonal Wave 1 and Wave 2 in Recent Boreal Winters

Remote Sensing, 2021
Planetary waves in the mesosphere are studied using observational data and models to establish their origin, as there are indications of their generation independently of waves in the stratosphere.
Yu Shi, Oleksandr Evtushevsky, Valerii Shulga, Gennadi Milinevsky, Andrew Klekociuk, Yulia Andrienko, Wei Han   +6 more
doaj   +1 more source

Planetary waves studied

Eos, Transactions American Geophysical Union, 1969
A four‐year investigation is being made in the Pacific Ocean for unseen and elusive ocean waves that are thought to be about 1000 miles in length and take two weeks to a month to complete one cycle. Planetary waves are believed to be caused by the gravitational attraction of the sun and moon on the earth.
openaire   +1 more source

Satellite observations of planetary waves in the mesosphere

Nature, 1976
THE pressure modulator radiometer (PMR) is one of the instruments carried by the Nimbus 6 observatory satellite launched on June 12, 1975 into a near polar circular orbit at an altitude of ∼ 1,000 km. The PMR sounds atmospheric temperature in the upper stratosphere and mesosphere (the 40–95 km height range) by measuring infrared emission from ...
Austen, M, Barnett, J, Curtis, P, Morgan, C, Houghton, J, Peskett, G, Rodgers, C, Williamson, E   +7 more
openaire   +2 more sources