Results 71 to 80 of about 1,743 (137)

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

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

Global Coronal Magnetic Field Estimation Using Bayesian Inference

The Astrophysical Journal
Estimating the magnetic field strength in the solar corona is crucial for understanding different physical processes happening over diverse spatiotemporal scales.
Upasna Baweja, Vaibhav Pant, Iñigo Arregui   +2 more
doaj   +1 more source

Numerical simulations of transverse oscillations in radiatively cooling coronal loops

, 2015
We aim to study the influence of radiative cooling on the standing kink oscillations of a coronal loop. Using the FLASH code, we solved the 3D ideal magnetohydrodynamic equations.
Magyar, N., Marcu, A., Van Doorsselaere, T.   +2 more
core   +1 more source

Preface to the special issue on “Old records for new knowledge”

Geoscience Data Journal, Volume 11, Issue 4, Page 357-364, October 2024.
Studying a changing world requires observations going back in time to extend and contextualize our latest scientific knowledge. Old legacy data exist in non‐digital formats. Thus, techniques and methodologies for the preservation, dissemination, interpretation, homogenization, calibration, and use of such legacy data and their associated metadata, as ...
Josep Batlló, Hisashi Hayakawa, Victoria Slonosky, Richard I. Crouthamel   +3 more
wiley   +1 more source

Evaluate the Impact of Regional Ionospheric Data Assimilation Model on Precise Point Positioning

Space Weather, Volume 22, Issue 8, August 2024.
Abstract This study presents an innovative approach to improving the accuracy and reducing the error convergence time of static Precise Point Positioning (PPP) in Global Positioning System (GPS) navigation. The research focuses on the impact of the high spatial and temporal resolution of a regional ionospheric data assimilation model on PPP over Taiwan.
Yan‐Shen Chen, Chia‐Hung Chen, Ming Yang, Feng‐Yu Chu   +3 more
wiley   +1 more source

The Lorentz Force at Work: Multiphase Magnetohydrodynamics throughout a Flare Lifespan

The Astrophysical Journal
The hour-long, gradual phase of solar flares is well observed across the electromagnetic spectrum, demonstrating many multiphase aspects, where cold condensations form within the heated post-flare system, but a complete 3D model is lacking. Using a state-
Wenzhi Ruan, Rony Keppens, Limei Yan, Patrick Antolin   +3 more
doaj   +1 more source

Inner Radiation Belt Simulations During the Successive Geomagnetic Storm Event of February 2022

Space Weather, Volume 22, Issue 7, July 2024.
Abstract Starting from 29 January 2022, a series of solar eruptions triggered a moderate geomagnetic storm on 3 February 2022, followed subsequently by another. Despite the typically minimal impact of unintense storms on space technology, 38 out of the 49 Starlink satellites underwent orbital decay, re‐entering Earth's atmosphere.
Kirolosse M. Girgis, Tohru Hada, Akimasa Yoshikawa, Shuichi Matsukiyo, Abraham C.‐L. Chian, Ezequiel Echer   +5 more
wiley   +1 more source

Determining the Polarization of a Coronal Standing Kink Oscillation Using Spectral Imaging Techniques with CoMP

The Astrophysical Journal
Coronal oscillations offer insight into energy transport and driving in the solar atmosphere. Knowing its polarization state helps constrain a wave’s displacement and velocity amplitude, improving estimates of wave energy flux and deposition rate.
T. J. Duckenfield, D. B. Jess, R. J. Morton, S. Jafarzadeh   +3 more
doaj   +1 more source

Three-dimensional kink modes in solar coronal slabs: Group velocities and their implications for impulsively excited waves

Astronomy & Astrophysics
Context. Little attention has been paid to group velocities of three-dimensional (3D) magnetohydrodynamic (MHD) waves in solar coronal seismology. Aims.
Liu Jing, Li Bo, Shi Mijie, Guo Mingzhe, Yu Hui   +4 more
doaj   +1 more source