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Alfv\'enic waves are known to be prevalent throughout the corona and solar wind. Determining the Poynting flux supplied by the waves is required for constraining their role in plasma heating and acceleration, as well as providing a…

太阳与恒星天体物理 · 物理学 2025-01-24 Richard J. Morton , Micah J. Weberg , N. Balodhi , James A. McLaughlin

Radio signals propagating via the solar corona and solar wind are significantly affected by compressive waves, impacting properties of solar bursts as well as sources viewed through the turbulent solar atmosphere. While static fluctuations…

太阳与恒星天体物理 · 物理学 2024-04-23 Francesco Azzollini , A. Gordon Emslie , Daniel L. Clarkson , Nicolina Chrysaphi , Eduard P. Kontar

The propagation and the evolution of Alfvenic pulses in the solar coronal arcades is investigated by means of MHD numerical simulations. Significant transverse oscillations in coronal loops, triggered by nearby flare events, are often…

天体物理学 · 物理学 2009-11-10 Luca Del Zanna , Eveline Schaekens , Marco Velli

Quasi-periodic, propagating fast mode magnetosonic waves in the corona were difficult to observe in the past due to relatively low instrument cadences. We report here evidence of such waves directly imaged in EUV by the new SDO AIA…

Recent observations have demonstrated that waves which are capable of carrying large amounts of energy are ubiquitous throughout the solar corona. However, the question of how this wave energy is dissipated (on which time and length scales)…

太阳与恒星天体物理 · 物理学 2014-11-20 Jiajia Liu , Scott W. McIntosh , Ineke De Moortel , James Threlfall , Christian Bethge

The discovery of ubiquitous low-frequency (3-5mHz) Alfvenic waves in the solar chromosphere (with Hinode/SOT), and corona (with CoMP and the Solar Dynamics Observatory, SDO) has provided some insight into the non-thermal energy content of…

太阳与恒星天体物理 · 物理学 2015-06-12 Scott W. McIntosh , Bart De Pontieu

Coronal bright fronts (CBFs) are large scale wavefronts that propagate though the solar corona at hundreds of kilometers per second. While their kinematics have been studied in detail, many questions remain regarding the temporal evolution…

太阳与恒星天体物理 · 物理学 2015-05-30 David M. Long , Edward E. DeLuca , Peter T. Gallagher

We show that the coronal heating and the fast solar wind acceleration in the coronal holes are natural consequence of the footpoint fluctuations of the magnetic fields at the photosphere, by performing one-dimensional magnetohydrodynamical…

天体物理学 · 物理学 2009-11-11 Takeru K. Suzuki , Shu-ichiro Inutsuka

The tenuous supersonic solar wind that streams from the top of the corona passes through a natural boundary -- the Alfv\'en surface -- that marks the causal disconnection of individual packets of plasma and magnetic flux from the Sun…

太阳与恒星天体物理 · 物理学 2015-06-19 C. E. DeForest , T. A. Howard , D. J. McComas

We solve numerically the ideal MHD equations with an external gravitational field in 2D in order to study the effects of impulsively generated linear and non-linear Alfv\'en waves into isolated solar arcades and coronal funnels. We analyze…

太阳与恒星天体物理 · 物理学 2015-09-23 J. J. Gonzalez-Aviles , F. S. Guzman

We report high resolution observations from the SDO/AIA of intensity oscillations in a hot, T~8-10 MK, loop. The AIA images show a large coronal loop that was rapidly heated following plasma ejection from one of the loop's footpoints. A…

太阳与恒星天体物理 · 物理学 2014-09-16 Pankaj Kumar , D. E. Innes , B. Inhester

Alfven waves and ion-cyclotron absorption of high-frequency waves are frequently brought into models devoted to coronal heating and fast solar-wind acceleration. Signatures of ion-cyclotron resonance have already been observed in situ in…

天体物理学 · 物理学 2009-11-13 L. Dolla , J. Solomon

Despite intensive studies of kink oscillations of coronal loops in the last decade, a large scale statistically significant investigation of the oscillation parameters has not been made using data from the Solar Dynamics Observatory (SDO).…

太阳与恒星天体物理 · 物理学 2016-01-13 C. R. Goddard , G. Nistic`o , V. M. Nakariakov , I. V. Zimovets

We study the propagation, reflection, and turbulent dissipation of Alfven waves in coronal holes and the solar wind. We start with the Heinemann-Olbert equations, which describe non-compressive magnetohydrodynamic fluctuations in an…

太阳与恒星天体物理 · 物理学 2014-11-20 Benjamin D. G. Chandran , Joseph V. Hollweg

There have been ubiquitous observations of wave-like motions in the solar atmosphere for decades. Recent improvements to space- and ground-based observatories have allowed the focus to shift to smaller magnetic structures on the solar…

太阳与恒星天体物理 · 物理学 2014-08-21 N. Freij , E. M. Scullion , C. J. Nelson , S. Mumford , S. Wedemeyer , R. Erdélyi

Longitudinal intensity oscillations along coronal loops that are interpreted as signatures of magneto-acoustic waves are observed frequently in different coronal structures. The aim of this paper is to estimate the physical parameters of…

太阳与恒星天体物理 · 物理学 2016-04-13 A. Abedini

This paper reviews our growing understanding of the physics behind coronal heating (in open-field regions) and the acceleration of the solar wind. Many new insights have come from the last solar cycle's worth of observations and theoretical…

太阳与恒星天体物理 · 物理学 2010-02-02 Steven R. Cranmer , John L. Kohl , Mari Paz Miralles , Adriaan A. van Ballegooijen

Context. We diagnose the properties of the plume and interplume regions in a polar coronal hole and the role of waves in the acceleration of the solar wind. Aims. We attempt to detect whether Alfven waves are present in the polar coronal…

太阳与恒星天体物理 · 物理学 2015-05-13 D. Banerjee , D. Perez-Suarez , J. G. Doyle

We review solar studies using AIA, HMI, and EVE data from the SDO spacecraft that revolutionized our physical understanding of the Sun. The relevant SDO studies cover the entire 15-year lifetime of SDO, from 2010 May 1 to 2025 May 1. The…

太阳与恒星天体物理 · 物理学 2025-07-04 Markus J. Aschwanden

This paper reviews the latest observational evidence for the existence of propagating waves in the open magnetic flux tubes of the solar corona. SOHO measurements have put tentative limits on the fluxes of various types of…

天体物理学 · 物理学 2007-05-23 Steven R. Cranmer