Results 61 to 70 of about 6,222 (212)

Simulations of the Poynting--Robertson Cosmic Battery in Resistive Accretion Disks

, 2007
We describe the results of numerical "2.5--dimensional" MHD simulations of an initially unmagnetized disk model orbiting a central point--mass and responding to the continual generation of poloidal magnetic field due to a secular source that emulates the
Bisnovatyi-Kogan G. S., Demosthenes Kazanas, Dimitris M. Christodoulou, Ioannis Contopoulos, Papaloizou J. C. B., Shakura N. I.   +5 more
core   +1 more source

Improved characterization and modeling of equatorial plasma depletions [PDF]

, 2018
This manuscript presents a method to identify the occurrence of Equatorial Plasma Bubbles (EPBs) with data gathered from receivers of Global Navigation Satellite System (GNSS).
Altadill, David, Barbosa, José, Blanch Llosa, Estefania, Camps Carmona, Adriano José, González Casado, Guillermo, Juan Zornoza, José Miguel, Orús Pérez, Raul, Riba Sagarra, Jaume, Sanz Subirana, Jaume, Vázquez Grau, Gregorio   +9 more
core   +3 more sources

Detection of Equatorial Plasma Bubbles Using the COSMIC‐2 Rate of TEC Index

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract Equatorial plasma bubbles (EPBs) are large‐scale plasma depletion structures that can disrupt Global Navigation Satellite Systems (GNSS) and other space‐based technologies. Several instruments have been employed to study EPB dynamics, with Total Electron Content (TEC) and Rate of TEC change Index (ROTI) data standing out as valuable parameters
Ana L. Christovam, Fabricio S. Prol, Marcio T. A. H. Muella   +2 more
wiley   +1 more source

Multi-instrument observations of ionospheric super plasma bubbles in the European longitude sector during the 23–24 April 2023 severe geomagnetic storm

Journal of Space Weather and Space Climate
This study’s objective is to better specify the rare occurrence of super equatorial plasma bubbles in particular to the European longitude sector, detailing their spatio-temporal evolution, and better understanding pre-conditions for their development ...
Zakharenkova Irina, Cherniak Iurii, Braun John J., Wu Qian, Sokolovskiy Sergey, Hunt Douglas, Weiss Jan-Peter   +6 more
doaj   +1 more source

A Synoptic‐Scale Wavelike Structure in the Nighttime Equatorial Ionization Anomaly

Earth and Space Science, 2021
Both ground‐ and satellite‐based airglow imaging have significantly contributed to understanding the low‐latitude ionosphere, especially the morphology and dynamics of the equatorial ionization anomaly (EIA).
J. Rodríguez‐Zuluaga, C. Stolle, Y. Yamazaki, C. Xiong, S. L. England   +4 more
doaj   +1 more source

Two-dimensional models of hydrodynamical accretion flows into black holes [PDF]

, 2000
We present a systematic numerical study of two-dimensional axisymmetric accretion flows around black holes. The flows have no radiative cooling and are treated in the framework of the hydrodynamical approximation.
Abramowicz M. A., Begelman M. C., Gilham S., Honma F., Igor V. Igumenshchev, Igumenshchev I. V., Jaroszynski M., Marek A. Abramowicz, Paczynski B., Shakura N. I., Shapiro S. L.   +10 more
core   +3 more sources

A High‐Efficiency Multivariable TEC‐SOFTS Model for Ionospheric TEC Prediction: Validation Over China Area During Low and High Solar Activity Periods

Space Weather, Volume 24, Issue 5, May 2026.
Abstract The ionospheric Total Electron Content (TEC) is a key parameter for characterizing the ionospheric properties. In this study, an efficient multivariable time series prediction model, TEC‐Series Core Fusion and efficient multivariable time series (TEC‐SOFTS), was constructed by combining multiple geomagnetic and solar activity indices ...
Chen Chen, Ling Huang, Wenwen Li, Dezhong Chen, Hongping Zhang, Yidong Lou, Lv Zhou   +6 more
wiley   +1 more source

Multi-instrumental analysis of the day-to-day variability of equatorial plasma bubbles

Frontiers in Astronomy and Space Sciences, 2023
This paper presents a multi-instrument observational analysis of the equatorial plasma bubbles (EPBs) variation over the American sector during a geomagnetically quiet time period of 07–10 December 2019.
Ercha Aa, Shun-Rong Zhang, Anthea J. Coster, Philip J. Erickson, William Rideout   +4 more
doaj   +1 more source

Spatial frequencies associated with the latitudinal structures of ionospheric currents seen by CHAMP satellite

, 2015
The CHAMP magnetic field variations during international quiet days of low solar activity period 2008-2009 are investigated. The present paper reports the existence of frequency-peaks < 20 mHz in the compressional component of the magnetic field in ...
Sinha, A. K., Thomas, Neethal, Vichare, Geeta   +2 more
core   +1 more source

Magnetars in the Metagalaxy: An Origin for Ultra High Energy Cosmic Rays in the Nearby Universe [PDF]

, 2002
I show that the relativistic winds of newly born magnetars with khz initial spin rates, occurring in all normal galaxies, can accelerate ultrarelativistic light ions with an E^{-1} injection spectrum, steepening to E^{-2} at higher energies, with an ...
Beuermann K., Bogovalov S. V., Bogovalov S. V., Bonazzola S., Boratav M., Cappellaro E., Cronin J. W., Davies R. M., Ehlerova S., Hummel E., Jonathan Arons, Kruskal M., Lisenfeld U., Lyne A. G., Melatos A., Melatos A., Michel F. C., Paczynski B., Thorne K. S., Torres D. F., Usov V. V., Zatsepin G. T., Zavlin V. E.   +22 more
core   +2 more sources