Results 61 to 70 of about 1,740 (142)

A Two‐Step Method for Enhancing Thermospheric Mass Density Empirical Model

Space Weather, Volume 23, Issue 5, May 2025.
Abstract With the rapid development of Low Earth Orbit constellations, the importance of accurately estimating thermospheric mass density is steadily increasing. Current empirical models still exhibit unavoidable biases in estimating thermospheric mass density.
Yu Guo, Fei Guo, Xiaohong Zhang, Yan Yang, Dengkui Mei, Xiaodong Ren   +5 more
wiley   +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

Chromospheric seismology above sunspot umbrae [PDF]

, 2015
The acoustic resonator is an important model for explaining the three-minute oscillations in the chromosphere above sunspot umbrae. The steep temperature gradients at the photosphere and transition region provide the cavity for the acoustic resonator ...
Arber, Avrett, B. Snow, Bard, Beckers, Bel, Boerner, Bogdan, Bogdan, Botha, Buhmann, De Moortel, De Moortel, Fleck, G. J. J. Botha, Lites, Maltby, Marsh, McIntosh, Rabello-Soares, Reznikova, Roberts, S. Régnier, Shibasaki, Stangalini, Staude, Sych, Taroyan, Thomas, Tian, Ulmschneider, Yuan, Yuan, Yuan, Zhugzhda   +34 more
core   +2 more sources

Nowcasting Solar Energetic Particle Events for Mars Missions

Space Weather, Volume 23, Issue 4, April 2025.
Abstract In addition to the omnipresent Galactic Cosmic Rays, sudden Solar Energetic Particle (SEP) events present considerable health hazards for manned space missions. These events not only contribute to an increased long‐term cancer risk, but can, in extreme cases, cause acute radiation syndromes.
Jan Leo Löwe, Salman Khaksarighiri, Robert F. Wimmer‐Schweingruber, Donald M. Hassler, Bent Ehresmann, Jingnan Guo, Günther Reitz, Thomas Berger, Daniel Matthiä, Cary Zeitlin, Sven Löffler   +10 more
wiley   +1 more source

Determination of the cross-field density structuring in coronal waveguides using the damping of transverse waves

, 2014
Time and spatial damping of transverse magnetohydrodynamic (MHD) kink oscillations is a source of information on the cross-field variation of the plasma density in coronal waveguides.
Arregui, I., Ramos, A. Asensio
core   +1 more source

NEUVAC: Nonlinear Extreme Ultraviolet Irradiance Model for Aeronomic Calculations

Space Weather, Volume 22, Issue 12, December 2024.
Abstract The need for reliable estimates of solar extreme ultraviolet (EUV) for operational space weather nowcasting and forecasting has motivated the development of new model of solar irradiance variability in 59 wavelength bins between 1 and 1,750 Å.
Daniel A. Brandt, Aaron J. Ridley
wiley   +1 more source

Spatial magneto-seismology : effect of density stratification on the first harmonic amplitude profile of transversal coronal loop oscillations [PDF]

, 2007
Context. The new generation of extreme-ultraviolet (EUV) imagers onboard missions such as the Solar Dynamics Observatory (SDO)and Solar Orbiter (SO) will provide the most accurate spatial measurements of post-flare coronal loop oscillations yet.
Erdélyi, R. (Robertus), Goossens, Marcel, Van Doorsselaere, Tom, Verth, G.   +3 more
core   +2 more sources

Comparative Analysis of Higher‐Order Ionospheric Delay on PPP Long‐Term Coordinate Time Series and Residual Modeling Using Horizontal Gradients and RINEX Data

Space Weather, Volume 22, Issue 12, December 2024.
Abstract Higher‐order ionospheric corrections, including second‐ and third‐order effects and signal bending, are essential for improving Global Navigation Satellite System (GNSS) time series accuracy. However, their influence on long‐term Precise Point Positioning (PPP) time series, particularly signal bending, remains underexplored.
Kaichun Yang, Weiping Jiang, Zhao Li, Xin Ding, Ran Lu   +4 more
wiley   +1 more source

Thermally damped linear compressional waves in a 2D solar coronal model [PDF]

, 2007
The high resolution observations (TRACE and SOHO) of waves in coronal structures have revealed a rapid damping of modes, sometimes their damping length being of the same order as their wavelength. The rapid damping of modes in coronal loops permits us to
Ballai, I., Marcu, A., Orza, B.
core   +1 more source

Near‐Real‐Time Identification of the Source of Ionospheric Disturbances

Journal of Geophysical Research: Space Physics, Volume 129, Issue 11, November 2024.
Abstract The ionosphere is characterized by a large number of disturbances generated in response to a wide range of phenomena, including natural hazards, space weather and man‐made events. Identification of the origin of ionospheric disturbances (ID), especially in real or near‐real‐time (NRT), is an extremely difficult task, and it is one of the most ...
B. Maletckii, E. Astafyeva
wiley   +1 more source