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We examine the structure, propagation and expansion of the shock associated with the 2012 July 23 extreme coronal mass ejection (CME). Characteristics of the shock determined from multi-point imaging observations are compared to in situ…

太阳与恒星天体物理 · 物理学 2017-01-19 Ying D. Liu , Huidong Hu , Bei Zhu , Janet G. Luhmann , Angelos Vourlidas

We present an analysis of the fast coronal mass ejection (CME) of 2012 March 7, which was imaged by both STEREO spacecraft and observed in situ by MESSENGER, Venus Express, Wind and Mars Express. Based on detected arrivals at four different…

太阳与恒星天体物理 · 物理学 2014-07-18 T. Rollett , C. Moestl , M. Temmer , R. A. Frahm , J. A. Davies , A. M. Veronig , B. Vrsnak , U. V. Amerstorfer , C. J. Farrugia , T. Zic , T. L. Zhang

We simulate possible stellar coronal mass ejection (CME) scenarios over the magnetic cycle of $\epsilon$ Eridani (18 Eridani; HD 22049). We use three separate epochs from 2008, 2011, and 2013, and estimate the radio emission frequencies…

Type II radio bursts are solar radio emissions generated by electrons accelerated by coronal shocks. These bursts are typically found close to expanding coronal mass ejections (CMEs), making them valuable for studying the properties and…

太阳与恒星天体物理 · 物理学 2026-05-13 K. Bhandari , D. E. Morosan , S. Normo

The most intense solar energetic particle events are produced by coronal mass ejections (CMEs) accompanied by intense type II radio bursts below 15 MHz. Understanding where these type II bursts are generated relative to an erupting CME…

太阳与恒星天体物理 · 物理学 2021-12-08 Alexander M. Hegedus , Ward B. Manchester , Justin C. Kasper

Solar flares and coronal mass ejections (CMEs) are manifestations of energy release in the solar atmosphere, which can be accompanied by dynamic mass motions and waves in the surrounding atmosphere. Here, we present observations of plasma…

太阳与恒星天体物理 · 物理学 2025-03-26 Mohamed Nedal , David M. Long , Catherine Cuddy , Lidia Van Driel-Gesztelyi , Peter T. Gallagher

We report ground based, low frequency heliograph (80 MHz), spectral (85-35 MHz) and polarimeter (80 and 40 MHz) observations of drifting, non-thermal radio continuum associated with the `halo' coronal mass ejection (CME) that occurred in…

太阳与恒星天体物理 · 物理学 2016-11-17 K. Sasikumar Raja , R. Ramesh , K. Hariharan , C. Kathiravan , T. J. Wang

The joint use of high-resolution data from PROBA2 and SDO satellites and LASCO/SOHO coronographs enabled us to examine early stages of initiation and propagation of six limb CMEs registered in June 2010 - June 2011. For five events under…

太阳与恒星天体物理 · 物理学 2026-01-06 V. G. Fainshtein , Ya. I. Egorov

We present a statistical investigation of the radial evolution of 28 interplanetary coronal mass ejections (ICMEs), measured in situ by the Parker Solar Probe (PSP) spacecraft from 2018 October to 2022 August. First, by analyzing the radial…

Solar type II radio bursts are commonly attributed to coronal shocks driven by coronal mass ejections (CMEs). However, some metric type II bursts have occasionally been reported to occur in the absence of a CME and to be associated with…

太阳与恒星天体物理 · 物理学 2025-12-23 Yingli Cui , Xiangliang Kong , Zhentong Li , Bing Wang , Yadan Duan , Ze Zhong , Hao Ning , Zhao Wu , Manqing Wang , Yang Liu , Feiyu Yu , Zelong Jiang , Wei Chen , Yang Su , Yao Chen

We report observations of type III radio bursts at decimeter wavelengths (type IIIdm bursts) -- signatures of suprathermal electron beams propagating in the low corona -- using the new technique of radio dynamic imaging spectroscopy…

太阳与恒星天体物理 · 物理学 2015-06-12 Bin Chen , Timothy S. Bastian , Stephen M. White , Dale E. Gary , Richard A. Perley , Michael P. Rupen , Brent R. Carlson

A coronal mass ejection (CME) associated with a type II burst and originating close to the center of the solar disk typically results in a shock at Earth in 2-3 days and hence can be used to predict shock arrival at Earth. However, a…

太阳与恒星天体物理 · 物理学 2015-06-05 N. Gopalswamy , P. Makela , S. Akiyama , S. Yashiro , H. Xie , R. J. MacDowall , M. L. Kaiser

The analysis of the spectral properties and dynamic evolution of a CME/shock event observed on November 1st 2003 in white-light by the LASCO coronagraph and in the ultraviolet by the UVCS instrument operating aboard SOHO, has been performed…

太阳与恒星天体物理 · 物理学 2012-11-20 Carlo Benna , Salvatore Mancuso , Silvio Giordano , Lorenzo Gioannini

In this article, the association of solar radio type IV bursts with active region location on the Sun is studied for the solar cycle 24. The active regions associated with moving and stationary type IV bursts are categorised as close to…

太阳与恒星天体物理 · 物理学 2022-08-03 Anshu Kumari

The Sun produces the most powerful explosions in the solar system, solar flares, that can also be accompanied by large eruptions of magnetised plasma, coronal mass ejections (CMEs). These processes can accelerate electron beams up to…

太阳与恒星天体物理 · 物理学 2023-07-05 D. E. Morosan , J. Pomoell , A. Kumari , E. K. J. Kilpua , R. Vainio

Coronal mass ejections (CMEs) are large eruptions of plasma and magnetic field from the low solar corona into interplanetary space. These eruptions are often associated with the acceleration of energetic electrons which produce various…

太阳与恒星天体物理 · 物理学 2017-12-20 Eoin P. Carley , Nicole Vilmer , Paulo J. A. Simões , Brían Ó Fearraigh

Employing coronagraphic and EUV observations close to the solar surface made by the Solar Terrestrial Relations Observatory (STEREO) mission, we determined the heliocentric distance of coronal mass ejections (CMEs) at the starting time of…

The backside coronal mass ejection (CME) of 2012 July 23 had a short Sun to Earth shock transit time (18.5 hours). The associated solar energetic particle (SEP) event had a >10 MeV proton flux peaking at ~5000 pfu, and the energetic storm…

太阳与恒星天体物理 · 物理学 2016-12-28 Nat Gopalswamy , Seiji Yashiro , Neeharika Thakur , Pertti Mäkelä , Hong Xie , Sachiko Akiyama

An interplanetary (IP) type-II-like radio burst is analyzed. It occurred on 2003 June 17-18 in association with a fast halo coronal mass ejection (CME), an M6.8 soft-X-ray (SXR) flare, and produced a solar proton event. Unlike coronal type…

天体物理学 · 物理学 2009-06-23 T. S. Bastian

Coronal Mass ejections or CMEs are large dynamical solar-corona events. The mass balance and kinematics of a fast limb CME, including its prominence progenitor and the associated flare, will be compared with computed magnetic structures to…

天体物理学 · 物理学 2009-11-13 Serge Koutchmy , Vladimir Slemzin , Boris Filippov , Jacques-Clair Noens , David Romeuf , Leon Golub