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Context. In time-distance helioseismology, wave travel times are measured from the two-point cross-covariance function of solar oscillations and are used to image the solar convection zone in three dimensions. There is, however, also…

太阳与恒星天体物理 · 物理学 2017-03-08 Kaori Nagashima , Damien Fournier , Aaron C. Birch , Laurent Gizon

The dynamical response of an Ising ferromagnet to a plane polarised standing magnetic field wave is modelled and studied here by Monte Carlo simulation in two dimensions. The amplitude of standing magnetic wave is modulated along the…

统计力学 · 物理学 2016-08-08 Ajay Halder , Muktish Acharyya

We present the observations of an extreme-ultraviolet (EUV) wave, which originated from the active region (AR) NOAA 12887 on 28 October 2021 and its impact on neighbouring loops. The event was observed by the Atmospheric Imaging Assembly…

太阳与恒星天体物理 · 物理学 2022-12-21 Pooja Devi , Ramesh Chandra , Arun Kumar Awasthi , Brigitte Schmieder , Reetika Joshi

We study the magnetic interaction between two superconducting concentric mesoscopic Al loops, close to the superconducting/normal phase transition. The phase boundary is measured resistively for the two-loop structure as well as for a…

超导电性 · 物理学 2009-11-07 M. Morelle , V. Bruyndoncx , R. Jonckheere , V. V. Moshchalkov

Prominence threads are very long and thin flux tubes which are partially filled with cold plasma. Observations have shown that transverse oscillations are frequent in these solar structures. The observations are usually interpreted as the…

太阳与恒星天体物理 · 物理学 2022-02-09 David Martínez-Gómez , Roberto Soler , Jaume Terradas , Elena Khomenko

Small-scale magnetic fields are thought to play an important role in the heating of the outer solar atmosphere. By taking advantage of the unprecedented high-spatial and temporal cadence of IMaX, the filter vector polarimeter on board the…

太阳与恒星天体物理 · 物理学 2015-06-15 M. Stangalini , S. K. Solanki , R. Cameron , V. Martìnez Pillet

Recent numerical studies of oscillating flux tubes have established the significance of resonant absorption in the damping of propagating transverse oscillations in coronal loops. The nonlinear nature of the mechanism has been examined…

太阳与恒星天体物理 · 物理学 2017-08-30 K. Karampelas , T. Van Doorsselaere , P. Antolin

Determining the preferred spatial location of the energy input to solar coronal loops would be an important step forward towards a more complete understanding of the coronal heating problem. Following on from Sarkar & Walsh (2008) this…

太阳与恒星天体物理 · 物理学 2009-07-22 Aveek Sarkar , Robert W Walsh

Longitudinal and transverse oscillations are frequently observed in the solar prominences and/or filaments. These oscillations are excited by a large scale shock wave, impulsive flares at one leg of the filament threads, or due to any low…

太阳与恒星天体物理 · 物理学 2019-12-25 Rakesh Mazumder , Vaibhav Pant , Manuel Luna , Dipankar Banerjee

Current analytical and numerical modelling suggest the existence of ubiquitous thin current sheets in the corona that could explain the observed heating requirements. On the other hand, new high resolution observations of the corona…

太阳与恒星天体物理 · 物理学 2015-06-19 P. Antolin , T. Yokoyama , T. Van Doorsselaere

We present measurements of periodicity for transverse loop oscillations during the periods of activity of two remote and separated (both temporally and spatially) flares. The oscillations are observed in the same location more than 100 Mm…

太阳与恒星天体物理 · 物理学 2022-06-08 Sandra M. Conde C , Rekha Jain , Vera Jatenco-Pereira

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

Impulsively excited wave trains are of considerable interest in solar coronal seismology. To our knowledge, however, it remains to examine the three-dimensional (3D) dispersive propagation of impulsive kink waves in straight, field-aligned,…

太阳与恒星天体物理 · 物理学 2022-11-16 Bo Li , Mingzhe Guo , Hui Yu , Shao-Xia Chen , Mijie Shi

The nature of solar wind turbulence in the dissipation range at scales much smaller than the large MHD scales remains under debate. Here a two-dimensional model based on the hybrid code abbreviated as A.I.K.E.F. is presented, which treats…

空间物理 · 物理学 2012-02-20 Daniel Verscharen , Eckart Marsch , Uwe Motschmann , Joachim Müller

Recent numerical studies revealed that transverse motions of coronal loops can induce the Kelvin-Helmholtz Instability (KHI). This process could be important in coronal heating because it leads to dissipation of energy at small…

太阳与恒星天体物理 · 物理学 2019-01-16 Mingzhe Guo , Tom Van Doorsselaere , Kostas Karampelas , Bo Li , Patrick Antolin , Ineke De Moortel

During the last ice age there were several quasi-periodic abrupt warming events. The climatic effects of the so-called Dansgaard-Oeschger (DO) events were felt globally, although the North Atlantic experienced the largest and most abrupt…

大气与海洋物理 · 物理学 2015-03-13 Raj Saha

In this work we review the efforts that have been done to study the excitation of the standing fast kink body mode in coronal loops. We mainly focus on the time-dependent problem, which is appropriate to describe flare or CME induced kink…

太阳与恒星天体物理 · 物理学 2010-02-23 J. Terradas

Three-minute oscillations over sunspot's umbra in AR 11131 were observed simultaneously in UV/EUV emission by SDO/AIA and in radio emission by Nobeyama Radioheliograph (NoRH). We use 24-hours series of SDO and 8-hours series of NoRH…

太阳与恒星天体物理 · 物理学 2015-05-30 V. E. Reznikova , K. Shibasaki , R. A. Sych , V. M. Nakariakov

Magnetograms acquired with the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) were used to calculate and analyze time variations of turbulence and multifractality in the photosphere during the…

太阳与恒星天体物理 · 物理学 2025-06-04 Valentina Abramenko

We analyse intensity variations, as measured by the Atmospheric Imaging Assembly (AIA) in the 171 {\AA} passband, in two coronal loops embedded within a single coronal magnetic arcade. We detect oscillations in the fundamental mode with…

太阳与恒星天体物理 · 物理学 2015-06-24 Rekha Jain , Ram A. Maurya , B. W. Hindman