Results 51 to 60 of about 279 (164)

Impact of Observation Errors on All‐Sky Satellite Microwave Data Assimilation. Part I: Interplay Between Observation Error and Variational Bias Correction (VarBC)

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 7, July 2026.
Abstract Careful specification of observation errors is crucial for assimilating all‐sky satellite microwave radiances, although uncertainties in these errors remain substantial. Operational centers often inflate observation errors to optimize model performance.
Chih‐Chi Hu, Mingjing Tong
wiley   +1 more source

First results from the Cluster wideband plasma wave investigation [PDF]

Annales Geophysicae, 2001
In this report we present the first results from the Cluster wideband plasma wave investigation. The four Cluster spacecraft were successfully placed in closely spaced, high-inclination eccentric orbits around the Earth during two separate launches
D. A. Gurnett, R. L. Huff, J. S. Pickett, A. M. Persoon, R. L. Mutel, I. W. Christopher, C. A. Kletzing, U. S. Inan, W. L. Martin, J.-L. Bougeret, H. St. C. Alleyne, K. H. Yearby   +11 more
doaj   +1 more source

Optimizing HAARP Beam Pattern for Generation of Strong F‐Region Field‐Aligned Irregularities

Radio Science, Volume 61, Issue 7, July 2026.
Abstract Field‐aligned irregularities (FAIs) are the signatures of plasma turbulence and convection in the mid‐ and high‐latitude F‐region ionosphere, and also provide coherent backscatter targets for HF radars. To serve irregularity generation and characterization studies, we conducted experiments at the High‐frequency Active Auroral Research Program (
T. S. Anderson, E. H. Lay, I. T. Cummings, C. A. Jeffery, P. A. Bernhardt, M. McCarrick, W. A. Bristow, S. J. Briczinski   +7 more
wiley   +1 more source

Infrared-radio-follow-up observations for detection of the magnetic radio emission of extra solar planets: a new window to detect exoplanets

Frontiers in Astronomy and Space Sciences
There are several methods for indirectly detecting exoplanets, such as transit, radial velocity, astrometry, and the conventional gravitational microlensing approach.
Fatemeh Bagheri, Fatemeh Bagheri, Ramon E. Lopez, Amir Shahmoradi, Amir Shahmoradi   +4 more
doaj   +1 more source

Modelling substorm chorus events in terms of dispersive azimuthal drift [PDF]

Annales Geophysicae, 2004
The Substorm Chorus Event (SCE) is a radio phenomenon observed on the ground after the onset of the substorm expansion phase. It consists of a band of VLF chorus with rising upper and lower cutoff frequencies.
A. B. Collier, A. B. Collier, A. R. W. Hughes   +2 more
doaj   +1 more source

Soft Proton Environment Modeling for SMILE Using XGBoost and Solar Cycle–Informed Synthetic Data Sets

Space Weather, Volume 24, Issue 7, July 2026.
Abstract Soft proton contamination presents a persistent threat to the performance of space‐based X‐ray observatories such as ESA's upcoming Solar‐wind Magnetosphere Ionosphere Link Explorer (SMILE). This study develops a machine‐learning framework for modeling soft proton fluxes in the 92.2–159.7 keV range, tailored to SMILE's elliptical, highly ...
Simon Mischel, Elena A. Kronberg, C. P. Escoubet   +2 more
wiley   +1 more source

The Decline and Fall of ROME. V. A Preliminary Search for Star-disrupted Planet Interactions and Coronal Activity at 5 GHz among White Dwarfs within 25 pc

The Astrophysical Journal
The recent discovery of planetesimals orbiting white dwarfs has renewed interest in the final chapters of the evolution of planetary systems. Although observational and theoretical studies have examined the dynamical evolution of these systems, studies ...
Matthew Route
doaj   +1 more source

New Observations of Cosmic Noise Absorption in the South American Magnetic Anomaly (SAMA) Using a Next‐Generation Riometer

Space Weather, Volume 24, Issue 7, July 2026.
Abstract This study reports the first observations of cosmic noise power (CNP) and cosmic noise absorption (CNA) obtained with a next‐generation riometer installed at the Southern Space Observatory (SSO/INPE) in Brazil, located within the South American Magnetic Anomaly (SAMA).
J. Moro, E. Correia, C. M. Wrasse, J. R. Costa, J. V. Bageston, C. M. Denardini, A. J. Valcorte, L. C. A. Resende, A. M. Santos, L. A. da Silva, J. P. Marchezi, T. S. Trondsen   +11 more
wiley   +1 more source

On the Correlation between Alfvén Waves and Auroral Radio Emissions in the Jovian System

The Astrophysical Journal
Jupiter’s powerful aurorae reflect intense energy dissipation in the magnetosphere–ionosphere system. Recent studies reveal that solar wind compression systematically enhances auroral emission, while the mechanism is not yet fully understood.
Yuening Chen, Zhonghua Yao, Shengyi Ye
doaj   +1 more source

Periodicities in radio emissions from Jupiter’s magnetosphere and consequences for radio emissions from star–exoplanet systems

Astronomy & Astrophysics
Context . The search for radio signals from exoplanets or star-planet interactions is a topic of major scientific interest, as it is likely the best way to detect and measure a planetary magnetic field and, therefore, to probe the inner structure of exoplanets.
C. K. Louis, A. Loh, P. Zarka, L. Lamy, E. Mauduit, J. Girard, J.-M. Grießmeier, B. Cecconi, Q. Nénon, S. Corbel   +9 more
openaire   +3 more sources