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We present a novel approach for investigating lens phenomenology of cosmic strings in order to elaborate detection strategies in galaxy deep field images. To account for the complexity of the projected energy distribution of string networks…

Astrophysics · Physics 2009-10-31 Francis Bernardeau , Jean-Philippe Uzan

We investigate the properties of acoustic events (AEs), defined as spatially concentrated and short duration energy flux, in the quiet sun using observations of a 2D field of view (FOV) with high spatial and temporal resolution provided by…

Solar and Stellar Astrophysics · Physics 2015-06-05 J. -M. Malherbe , T. Roudier , M. Rieutord , T. Berger , Z. Frank

The new generation of low radio-frequency interferometric arrays have enabled the imaging of the solar corona at high spectro-temporal resolutions and sensitivity. In this article we introduce and implement a formalism to generate flux…

Solar and Stellar Astrophysics · Physics 2017-10-31 Atul Mohan , Divya Oberoi

Event detection has been one of the most important research topics in social media analysis. Most of the traditional approaches detect events based on fixed temporal and spatial resolutions, while in reality events of different scales…

Social and Information Networks · Computer Science 2015-08-31 Xiaowen Dong , Dimitrios Mavroeidis , Francesco Calabrese , Pascal Frossard

Understanding electron acceleration associated with magnetic energy release at sub-second scales presents a major challenges in solar physics. Solar radio spikes observed as sub-second, narrow bandwidth bursts with…

Solar and Stellar Astrophysics · Physics 2023-04-06 Daniel L. Clarkson , Eduard P. Kontar , Nicole Vilmer , Mykola Gordovskyy , Xingyao Chen , Nicolina Chrysaphi

We discuss how to exploit stochastic resonance with the methods of statistical theory of decisions. To do so, we evaluate two detection strategies: escape time analysis and strobing. For a standard quartic bistable system with a periodic…

Data Analysis, Statistics and Probability · Physics 2016-01-12 Paolo Addesso , Vincenzo Pierro , Giovanni Filatrella

We present the statistical method to study the interaction between a chosen protein and another molecule (e.g., both being components of lubricin found in synovial fluid) in a water environment. The research is performed on the example of…

The Interface Region Imaging Spectrograph(IRIS) with its high spatial and temporal resolution brings exceptional plasma diagnostics of solar chromospheric and coronal activity during magnetic reconnection. The aim of this work is to study…

Solar and Stellar Astrophysics · Physics 2021-01-20 Reetika Joshi , Brigitte Schmieder , Akiko Tei , Guillaume Aulanier , Juraj Lörinčík , Ramesh Chandra , Petr Heinzel

Strongly Doppler-shifted Stokes $V$ profiles have been detected in the quiet Sun with the IMaX instrument on-board the SUNRISE stratospheric balloon-borne telescope. High velocities are required in order to produce such signals, hence these…

Solar and Stellar Astrophysics · Physics 2015-02-20 F. Rubio da Costa , S. K. Solanki , S. Danilovic , J. Hizberger , V. Martínez-Pillet

Recent observations of Krucker & Benz (1998) give strong support to Parker's hypothesis (Parker 1988) that small scale dissipative events make the main contribution to quiet Sun coronal heating. They also showed that these small scale…

Astrophysics · Physics 2009-11-06 V. Krasnoselskikh , O. Podladchikova , B. Lefebvre , N. Vilmer

Large solar energetic particle (SEP) events are thought to originate from the shocks driven by fast coronal mass ejections (CMEs) and thus generally accompanied by type II radio bursts. However, a significant proportion of type II radio…

Solar and Stellar Astrophysics · Physics 2026-04-23 Xuchun Duan , Ting Li , Yingli Cui , Yijun Hou , Chuan Li , Nicolas Wijsen , Zelong Jiang , Yihua Yan , Suli Ma , Zheng Sun

Impulsive short term variations occur in all kinds of solar-type stars. They are the results of complex phenomena such as the stellar magnetic field reconnection, low-level variability or in some cases even star-planet interactions. The…

Solar and Stellar Astrophysics · Physics 2022-06-01 Salvatore Colombo , Antonio Petralia , Giuseppina Micela

Sun-as-a-star analyses serve as a bridge for comparative studies on solar and stellar activities. To investigate the typical Sun-as-a-star Ha temporal spectral characteristics in solar eruption source regions, we analyzed five different…

Solar and Stellar Astrophysics · Physics 2025-08-26 Xiaofeng Liu , Yijun Hou , Ying Li , Ye Qiu , Ting Li , Yingjie Cai , Shihao Rao , Junyi Zhang , Chuan Li

Aims. We examine high time resolution dynamic spectra for fine structures in type II solar radio bursts Methods. We used data obtained with the (SAO) receiver of the Artemis-JLS (ARTEMIS-IV) solar radio spectrograph in the 450-270 MHz range…

Solar and Stellar Astrophysics · Physics 2019-04-17 S. Armatas , C. Bouratzis , A. Hillaris , C. E. Alissandrakis , P. Preka-Papadema , X. Moussas , E. Mitsakou , P. Tsitsipis , A. Kontogeorgos

In this paper, we review observational aspects of three common small-scale energetic events in the solar transition region (TR), namely: TR explosive events, ultraviolet bursts and jets. These events are defined in either (both) spectral or…

Solar and Stellar Astrophysics · Physics 2019-04-16 Zhenghua Huang , Bo Li , Lidong Xia

Solar radio bursts are some of the brightest emissions at radio frequencies in the solar system. The emission mechanisms that generate these bursts offer a remote insight into physical processes in solar coronal plasma, while fine spectral…

Solar and Stellar Astrophysics · Physics 2024-01-10 Pearse C. Murphy , Baptiste Cecconi , Carine Briand , Stéphane Aicardi

A web-based, interactive system for the remote processing of imaging data sets (i.e., EUV, X-ray and microwave) and the automated interactive detection of wave and oscillatory phenomena in the solar atmosphere is presented.The system…

Solar and Stellar Astrophysics · Physics 2015-05-19 R. A. Sych , V. M. Nakariakov , S. Anfinogentov , L. Ofman

Transition-region explosive events (EEs) are characterized by non-Gaussian line profiles with enhanced wings at Doppler velocities of 50-150 km/s. They are believed to be the signature of solar phenomena that are one of the main…

Solar and Stellar Astrophysics · Physics 2016-11-15 Z. Huang , M. S. Madjarska , E. M. Scullion , L. -D. Xia , J. G. Doyle , T. Ray

We present meter wave solar radio spectra of the highest spectrotemporal resolution achieved to date. The observations, obtained with the first station of the Long Wavelength Array (LWA1), show unprecedented detail of solar emissions across…

Solar and Stellar Astrophysics · Physics 2015-11-04 Samuel Tun Beltran , Sean Cutchin , Stephen White

Avalanche models running in a self-organized critical regime have proven powerful in reproducing the power-law distributions and scale invariance that characterize the statistical properties of solar flares. They are often interpreted as…

Solar and Stellar Astrophysics · Physics 2025-07-01 Louis-Simon Guité , Paul Charbonneau , Antoine Strugarek