Results 101 to 110 of about 10,736 (185)

High-harmonic Plasma Emission Induced by Electron Beams in Weakly Magnetized Plasmas

The Astrophysical Journal
Electromagnetic radiation at higher harmonics of the plasma frequency ( ω ∼ n ω _pe , n > 2) has been occasionally observed in type II and type III solar radio bursts, yet the underlying mechanism remains undetermined.
Chuanyang Li, Yao Chen, Zilong Zhang, Hao Ning, TangMu Li   +4 more
doaj   +1 more source

Estimating the lateral speed of a fast shock driven by a coronal mass ejection at the location of solar radio emissions

Astronomy & Astrophysics
Context. Fast coronal mass ejections (CMEs) can drive shock waves capable of accelerating electrons to high energies. These shock-accelerated electrons act as sources of electromagnetic radiation, often in the form of solar radio bursts. Recent findings suggest that radio imaging of solar radio bursts can provide a means to estimate the lateral ...
S. Normo, D. E. Morosan, E. K. J. Kilpua, J. Pomoell   +3 more
openaire   +3 more sources

Weak Solar Radio Bursts from the Solar Wind Acceleration Region Observed by the Parker Solar Probe and Its Probable Emission Mechanism

The Astrophysical Journal
The Parker Solar Probe (PSP) provides us with an unprecedentedly close approach to the observation of the Sun and hence the possibility of directly understanding the elementary process that occurs on the kinetic scale of particles' collective interaction
Ling Chen, Bing Ma, DeJin Wu, Xiaowei Zhou, Marc Pulupa, PeiJin Zhang, Pietro Zucca, Stuart D. Bale, Justin C. Kasper, SuPing Duan   +9 more
doaj   +1 more source

The Heliophysics Feature Catalogue, a tool for the study of solar features [PDF]

, 2017
The behavior of filaments and prominences during the Solar Cycle is a signature of Sun's activity. It is therefore important to follow their evolution during the cycle, in order to be able to associate it with the various phases of the Solar Cycle as ...
Aboudarham, Jean, Bentley, Robert D., Bonnin, Xavier, Cecconi, Baptiste, Csillaghy, André, Fuller, Nicolas, Renié, Christian   +6 more
core  

Analyzing Electron Beam-Induced Coronal Extreme Ultraviolet Emissions and Solar Radio Bursts Type III During M-Class Flares: A Preliminary Study

Journal of Physics: Conference Series
Abstract Solar flare events are triggered by the process of magnetic reconnection, which leads to a sudden release of stored magnetic energy and intensifies the electromagnetic emissions across the entire spectrum. In this preliminary study, we investigate the role of accelerated electron beams from acceleration site in enhancing Extreme
WZA Wan Mokhtar, AK Ariffin, ANM Daud, MF Umar, R Umar   +4 more
openaire   +1 more source

First Detection of Low-frequency Striae in Interplanetary Type III Radio Bursts

The Astrophysical Journal Letters
We report the first detection of type III solar radio burst striae in the 30–80 kHz range, observed by the Cluster-4 spacecraft during an exceptionally quiet solar period.
Vratislav Krupar, Eduard P. Kontar, Jan Soucek, Lynn B. Wilson III, Adam Szabo, Oksana Kruparova, Hamish A. S. Reid, Mychajlo Hajos, David Pisa, Ondrej Santolik, Milan Maksimovic, Jolene S. Pickett   +11 more
doaj   +1 more source

Multiwavelength Observations of an Eruptive Flare: Evidence for Blast Waves and Break-out

, 2013
Images of an east-limb flare on 3 November 2010 taken in the 131 \AA\ channel of the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory provide a convincing example of a long current sheet below an erupting plasmoid, as predicted by the ...
Innes, D. E., Kumar, Pankaj
core   +1 more source

CME liftoff with high-frequency fragmented type II burst emission

, 2008
Aims: Solar radio type II bursts are rarely seen at frequencies higher than a few hundred MHz. Since metric type II bursts are thought to be signatures of propagating shock waves, it is of interest to know how these shocks, and the type II bursts, are ...
Bougeret, Brueckner, Cairns, Cane, Cliver, Dulk, Gary, Handy, J. Pomoell, Khan, Klassen, Klein, Kosugi, Lin, Mann, McTiernan, Melrose, Odstrcil, Oliver, Pohjolainen, Pohjolainen, Pohjolainen, R. Vainio, Rust, S. Pohjolainen, Saito, Subramanian, Temmer, Tsuneta, Vrsnak, Vrsnak, Vrsnak, Vrsnak   +32 more
core   +1 more source

New Insights into Type-I Solar Noise Storms from High Angular Resolution Spectroscopic Imaging with the Upgraded Giant Metrewave Radio Telescope

The Astrophysical Journal
Type-I solar noise storms are perhaps the most commonly observed active radio emissions from the Sun at meter-wavelengths. Noise storms have a long-lived and wideband continuum background with superposed islands of much brighter narrowband and short ...
Surajit Mondal, Devojyoti Kansabanik, Divya Oberoi, Soham Dey   +3 more
doaj   +1 more source

Study of solar brightness profiles in the 18–26 GHz frequency range with INAF radio telescopes

Astronomy & Astrophysics
Context. One of the most important objectives of solar physics is to gain a physical understanding of the solar atmosphere, whose structure can also be described in terms of the density (N) and temperature (T) distributions of the atmospheric matter. Several multi-frequency analyses have shown that the characteristics of these distributions are still ...
M. Marongiu, A. Pellizzoni, S. Righini, S. Mulas, R. Nesti, A. Burtovoi, M. Romoli, G. Serra, G. Valente, E. Egron, G. Murtas, M. N. Iacolina, A. Melis, S. L. Guglielmino, S. Loru, P. Zucca, A. Zanichelli, M. Bachetti, A. Bemporad, F. Buffa, R. Concu, G. L. Deiana, C. Karakotia, A. Ladu, A. Maccaferri, P. Marongiu, M. Messerotti, A. Navarrini, A. Orfei, P. Ortu, M. Pili, T. Pisanu, G. Pupillo, P. Romano, A. Saba, L. Schirru, C. Tiburzi, L. Abbo, F. Frassati, M. Giarrusso, G. Jerse, F. Landini, M. Pancrazzi, G. Russano, C. Sasso, R. Susino   +45 more
openaire   +2 more sources