Results 51 to 60 of about 225 (104)

Quantification of Representation Error in the Neutral Winds and Ion Drifts Using Data Assimilation

Space Weather
In this work we quantify the representation error of the algorithm Estimating Model Parameters from Ionospheric Reverse Engineering (EMPIRE), which estimates global neutral winds and ion drifts given time‐varying plasma densities. SAMI3 (Sami3 is A Model
Jiahui Hu, Aurora López Rubio, Alex Chartier, Sarah McDonald, Seebany Datta‐Barua   +4 more
doaj   +1 more source

The Transient IDEMIX Model as a Nonorographic Gravity Wave Parameterization in an Atmospheric Circulation Model

Journal of Advances in Modeling Earth Systems, Volume 17, Issue 5, May 2025.
Abstract The Internal wave Dissipation, Energy and Mixing (IDEMIX) model presents a novel way of parameterizing internal gravity waves in the atmosphere. Using a continuous full wave spectrum in the energy balance equation and integrating over all vertical wavenumbers and frequencies results in prognostic equations for the energy density of gravity ...
B. Quinn, C. Eden, D. Olbers, G. S. Voelker, U. Achatz   +4 more
wiley   +1 more source

Investigating the Climatology of Mesospheric and Thermospheric Gravity Waves at High Northern Latitudes [PDF]

, 2018
An important property of the Earth\u27s atmosphere is its ability to support wave motions, and indeed, waves exist throughout the Earth\u27s atmosphere at all times and all locations. What is the importance of these waves?
Negale, Michael
core   +1 more source

Magnetically Quiet‐Time Traveling Ionospheric Disturbances Over Mid‐Latitude Eastern Europe Observed by the Kharkiv Incoherent Scatter Radar During the 24th Solar Cycle

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract We have detected and characterize traveling ionospheric disturbances (TIDs) in the mid‐latitude ionosphere over Europe using data from the Kharkiv incoherent scatter (IS) radar. The study focused on observations near solstices and equinoxes during solar cycle 24 under magnetically quiet conditions.
Kateryna D. Aksonova, Sergii V. Panasenko, Dalia Buresova, Larisa P. Goncharenko, Shun‐Rong Zhang, Igor F. Domnin   +5 more
wiley   +1 more source

Effects of CME and CIR induced geomagnetic storms on low-latitude ionization over Indian longitudes in terms of neutral dynamics

, 2020
This paper presents the response of the ionosphere during the intense geomagnetic storms of October 12-20, 2016 and May 26-31, 2017 which occurred during the declining phase of the solar cycle 24. Total Electron Content (TEC) from GPS measured at Indore,
Chakraborty, Sumanjit, Datta, Abhirup, Paul, Ashik, Ray, Sarbani, Sur, Dibyendu   +4 more
core   +1 more source

Successively Equatorward Propagating Ionospheric Acoustic Waves and Possible Mechanisms Following the Mw 7.5 Earthquake in Noto, Japan, on 1 January 2024

Space Weather, Volume 23, Issue 4, April 2025.
Abstract On 1 January 2024, the Mw 7.5 Noto Peninsula earthquake in Japan generated ionospheric disturbances detected via dense GNSS networks. Significant coseismic acoustic waves emerged ∼8 min post‐event, exhibiting 0.3 TECU amplitudes, 2–8 min periods, and ∼1 km/s propagation speeds.
Bing Zhang, Tong Liu, Xueshang Feng, Guochang Xu   +3 more
wiley   +1 more source

The Role of Wind Velocity, Wind Shear, and Electric Fields in the Formation of Sporadic E (Es)

Atmosphere
The important role of neutral wind, its vertical shear, and external electric fields in the formation and localization of sporadic E (Es) are demonstrated analytically and numerically in equatorial and mid-latitude regions.
Goderdzi G. Didebulidze, Giorgi Dalakishvili, Maya Todua   +2 more
doaj   +1 more source

Characteristics of Sporadic E Layer Occurrence in a Global Chemistry‐Climate Model: A Comparison With COSMIC‐Derived Data

Journal of Geophysical Research: Space Physics, Volume 130, Issue 1, January 2025.
Abstract This study presents an analysis of sporadic‐E (Es) structures within WACCM‐X (the Whole Atmosphere Community Climate Model with thermosphere and ionosphere eXtension), including electrodynamical transport of metallic ions. A set of selection criteria have been developed to identify Es layers in WACCM‐X output based on the total metal ion ...
Tasha Aylett, Wuhu Feng, Daniel R. Marsh, David R. Themens, John M. C. Plane   +4 more
wiley   +1 more source

Sounding Rocket Measurements of Vertically-Sheared F Region Neutral Winds at Sunset and Modeling of their Effect on Spread F Development [PDF]

, 2016
During the hours near sunset, Earth’s equatorial ionosphere undergoes signif-icant changes as it transitions from day to night. This period is a dynamic time that preconditions the ionosphere for a number of plasma instabilities that may develop over the
Kiene, Andrew
core   +1 more source

Evaluating Numerical Weather Prediction Models in the Middle Atmosphere Using Coherent Oceanic Acoustic Noise Observations

Journal of Geophysical Research: Atmospheres, Volume 129, Issue 23, 16 December 2024.
Abstract We develop a method to assess numerical weather prediction (NWP) model performances from the mid‐stratosphere to the mesosphere‐lower thermosphere (∼ ${\sim} $30–120 km), through comparisons between observed and simulated amplitude of oceanic infrasound known as microbaroms.
P. Letournel, C. Listowski, M. Bocquet, A. Le Pichon, A. Farchi   +4 more
wiley   +1 more source