Results 31 to 40 of about 2,802,659 (186)

Observations of Circularly Polarized Radio Emission from the “Quiet” Sun at Frequencies <100 MHz

The Astrophysical Journal
The presence of the magnetic field makes the solar coronal medium birefringent. Research indicates that an appreciable degree of circular polarization (DCP) can be observed in the thermal radio emission at frequencies
Shaik Sayuf, C. Kathiravan, R. Ramesh, Indrajit V. Barve, G. V. S. Gireesh, Kshitij S. Bane   +5 more
doaj   +1 more source

Global Ionospheric Responses to Four X‐Class Solar Flares in November 2025

Space Weather, Volume 24, Issue 11, November 2026.
Abstract We investigate global ionospheric responses to four X‐class solar‐disk flares that occurred in November 2025 from the same solar active region, using multi‐instrument observations including GNSS, ionosonde, geomagnetic and GOES solar irradiance data. Pronounced dayside TEC enhancements are observed for three flares (#2 X1.2, #3 X5.1, and #4 X4.
Lei Liu, Shasha Zou
wiley   +1 more source

ELECTRON CYCLOTRON MASER EMISSION IN CORONAL ARCHES AND SOLAR RADIO TYPE V BURSTS

The Astrophysical Journal, 2013
Solar radio type V bursts were classified as a special spectral class based on their moderately long duration, wide bandwidth, and sense of polarization opposite of associated type III bursts. However, type V bursts are also closely related to the preceding type III bursts.
J. F. Tang, D. J. Wu, C. M. Tan
openaire   +1 more source

Tidal Variability in the Lower Thermosphere: Relative Importance of ENSO, QBO, PJO, MJO, and Lyα

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 20, 28 October 2026.
Abstract Atmospheric tides in the lower thermosphere play an important role in regulating upper‐atmospheric conditions relevant to space weather. However, their spatial and temporal variability remains poorly understood, apart from seasonal variations. Previous studies have shown that tides can be influenced by meteorological and solar conditions. This
Yosuke Yamazaki, Huixin Liu, Kaoru Sato, Dai Koshin, Claudia Stolle   +4 more
wiley   +1 more source

Propagation Dynamics of Fast Electron Beam and Its Electron Cyclotron Maser Emission

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract Fast electron beams (FEBs) and coherent radio bursts both are very common plasma activity phenomena in the cosmos. The electron cyclotron maser (ECM) instability driven by FEBs trapped in magnetic fields can directly amplify radio wave radiations.
Ling Chen, Dejin Wu, Jianfei Tang, Guoqing Zhao   +3 more
wiley   +1 more source

Unprecedented 19 Day Type IV Radio Burst as a Corotating Electron Reservoir

The Astrophysical Journal Letters
We report a hectometric (0.5–3 MHz) type IV continuum observed over nearly 19 days (2025 August 21–September 9) in three successive visibility windows as the source corotates with the Sun—first at Solar Orbiter, then 12 days later in the near-Earth ...
Vratislav Krupar, Oksana Kruparova, Adam Szabo, Lynn B. Wilson III, Lan K. Jian, David Lario, Teresa Nieves-Chinchilla, Andreas J. Weiss, Anthony Iampietro, Hamish A. S. Reid, Lucie M. Green, Eduard P. Kontar, Rui F. Pinto, Keith Goetz   +13 more
doaj   +1 more source

The Effects of ICME Composition on the Sputtered Component of the Lunar Exosphere

Journal of Geophysical Research: Planets, Volume 131, Issue 10, October 2026.
Abstract Charged‐particle sputtering is a fundamental process that contributes to the generation of the Moon’s neutral exosphere. Neutral sputtering rates are dependent on the speed, flux, and composition of the incident charged‐particle populations, all of which are variable at the Moon’s orbit.
A. R. Poppe, Q. Nénon, P. S. Szabo, S. R. Carberry Mogan, C. O. Lee   +4 more
wiley   +1 more source

RETRACTED: Quantitative prediction of type II solar radio emission from the Sun to 1 AU

Geophysical Research Letters, 2016
Coronal mass ejections (CMEs) are frequently associated with shocks and type II solar radio bursts. Despite involving fundamental plasma physics and being the archetype for collective radio emission from shocks, type II bursts have resisted detailed ...
J. M. Schmidt, Iver H. Cairns
doaj   +1 more source

Characterizing the Spectral Structure of Weak Impulsive Narrowband Quiet Sun Emissions

The Astrophysical Journal, 2023
Weak Impulsive Narrowband Quiet Sun Emissions (WINQSEs) are a newly discovered class of radio emission from the solar corona. These emissions are characterized by their extremely impulsive, narrowband, and ubiquitous nature.
Surajit Mondal, Divya Oberoi, Ayan Biswas, Devojyoti Kansabanik   +3 more
doaj   +1 more source

Ionospheric Mechanisms Leading to Plasma‐Bubble Zonal Drift Reversal and Deformation During the 12 November 2025 Geomagnetic Storm

Space Weather, Volume 24, Issue 10, October 2026.
Abstract We present a multi‐instrument analysis of the ionospheric response to the intense geomagnetic storm of 12 November 2025 over the American sector, with emphasis on the longitudinally asymmetric deformation, latitudinal expansion, and zonal drift reversal of equatorial plasma bubbles (EPBs).
G. A. S. Picanço, I. Galkin, P. Song, E. Astafyeva, L. C. A. Resende, J. P. Marchezi, L. A. da Silva, P. R. Fagundes, C. M. Denardini, C. Martinis, A. M. Santos, V. G. Pillat, A. J. Coster, A. L. Christovam, S. R. Laranja, M. A. M. Lopes   +15 more
wiley   +1 more source