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The excitation and damping of transversal coronal loop oscillations and quantitative relation between damping time, damping quality (damping time per period), oscillation amplitude, dissipation mechanism and the wake phenomena are…

太阳与恒星天体物理 · 物理学 2018-02-14 A. Abedini

The classic accepted view of the heliosphere is a quiescent, comet-like shape aligned in the direction of the Sun's travel through the interstellar medium (ISM) extending for 1000's of AUs (AU: astronomical unit). Here we show, based on…

太阳与恒星天体物理 · 物理学 2015-06-23 M. Opher , J. F. Drake , B. Zieger , T. I. Gombosi

There is intense interest in determining the precise contribution of Alfv\'enic waves propagating along solar structures to the problems of coronal heating and solar wind acceleration. Since the launch of SDO/AIA, it has been possible to…

太阳与恒星天体物理 · 物理学 2015-06-22 J. O. Thurgood , R. J Morton , J. A. McLaughlin

Coronal loops are building blocks of solar active regions. However, their formation mechanism is still not well understood. Here we present direct observational evidence for the formation of coronal loops through magnetic reconnection as…

太阳与恒星天体物理 · 物理学 2021-07-14 Zhenyong Hou , Hui Tian , Hechao Chen , Xiaoshuai Zhu , Zhenghua Huang , Xianyong Bai , Jiansen He , Yongliang Song , Lidong Xia

Coronal jets, which extend from the solar surface to beyond 2 $R_\odot$, were observed in the polar coronal hole regions during the total solar eclipse on 2017 August 21. In a time-series of white-light images of the corona spanning 70…

We study the formation of coronal jets through numerical simulation of the emergence of a twisted magnetic flux rope into a pre-existing open magnetic field. Reconnection inside the emerging flux rope in addition to that between the…

太阳与恒星天体物理 · 物理学 2015-06-19 Fang Fang , Yuhong Fan , Scott W. McIntosh

We present observations of persistent oscillations of some bright features in the upper-chromosphere/transition-region above sunspots taken by IRIS SJ 1400 {\AA} and upward propagating quasi-periodic disturbances along coronal loops rooted…

太阳与恒星天体物理 · 物理学 2018-03-21 Zhenyong Hou , Zhenghua Huang , Lidong Xia , Bo Li , Hui Fu

We present an observational study of the kinematics and fine structure of an unwinding polar jet, with high temporal and spatial observations taken by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamic Observatory (SDO) and…

太阳与恒星天体物理 · 物理学 2011-06-24 Yuandeng Shen , Yu Liu , Jiangtao Su , Ahmed Ibrahim

Observations reveal a correspondence between chromospheric type II spicules and bright upwardly moving fronts in the corona observed in the EUV band. However, theoretical considerations suggest that these flows are unlikely to be the main…

太阳与恒星天体物理 · 物理学 2014-09-05 A. Petralia , F. Reale , S. Orlando , J. A. Klimchuk

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

We report the first unambiguous observational evidence in the radio range of the reflection of a coronal shock wave at the boundary of a coronal hole. The event occurred above an active region located at the northwest limb of the Sun and…

太阳与恒星天体物理 · 物理学 2021-07-28 S. Mancuso , A. Bemporad , F. Frassati , D. Barghini , S. Giordano , D. Telloni , C. Taricco

The Parker Solar Probe (PSP) has observed copious rapid magnetic field direction changes in the near-Sun solar wind. These features have been called "switchbacks," and their origin is a mystery. But their widespread nature suggests that…

太阳与恒星天体物理 · 物理学 2020-06-24 Alphonse C. Sterling , Ronald L. Moore

We report on the plasma properties of small-scale transient events identified in the quiet Sun, coronal holes and their boundaries. We use spectroscopic co-observations from SUMER/SoHO and EIS/Hinode combined with high cadence imaging data…

太阳与恒星天体物理 · 物理学 2015-06-05 M. S. Madjarska , Z. Huang , J. G. Doyle , S. Subramanian

We model a coronal loop as a three-dimensional magnetic cylinder in a realistic solar atmosphere that extends from the chromosphere to the corona. Kink oscillations, believed ubiquitous in the solar corona, are launched in the loop. Heating…

太阳与恒星天体物理 · 物理学 2023-05-31 Mingzhe Guo , Timothy Duckenfield , Tom Van Doorsselaere , Konstantinos Karampelas , Gabriel Pelouze , Yuhang gao

We report high-resolution, high-cadence observations of five small-scale coronal jets in an on-disk quiet Sun region observed with Solar Orbiter's EUI/\hri\ in 174 \AA. We combine the \hri\ images with the EUV images of SDO/AIA and…

太阳与恒星天体物理 · 物理学 2023-02-01 Navdeep K. Panesar , Viggo H. Hansteen , Sanjiv K. Tiwari , Mark C. M. Cheung , David Berghmans , Daniel Müller

Damped transverse oscillations of magnetic loops are routinely observed in the solar corona. This phenomenon is interpreted as standing kink magnetohydrodynamic waves, which are damped by resonant absorption owing to plasma inhomogeneity…

太阳与恒星天体物理 · 物理学 2015-10-28 Roberto Soler , Manuel Luna

New XRT observations of the north polar region taken from the X-ray Telescope (XRT) of the Hinode (Solar-B) spacecraft are used to analyze several time sequences showing small loop brightenings with a long ray above. We focus on the…

天体物理学 · 物理学 2015-05-13 B. Filippov , L. Golub , S. Koutchmy

Solar coronal jets have been observed in detail since the early 1990s. While it is clear that these jets are magnetically driven, the details of the driving process has recently been updated. Previously it was suspected that the jets were a…

太阳与恒星天体物理 · 物理学 2019-12-06 Alphonse C. Sterling

The ubiquitous solar jets or jet-like activities are generally regarded as an important source of energy and mass input to the upper solar atmosphere and the solar wind. However, questions about their triggering and driving mechanisms are…

太阳与恒星天体物理 · 物理学 2019-10-02 Yuandeng Shen , Zhining Qu , Ding Yuan , Huadong Chen , Yadan Duan , Chengrui Zhou , Zehao Tang , Jin Huang , Yu Liu

Observations of reconnection jets in the solar corona are emerging as a possible diagnostic to study highly elusive coronal heating. Such nanojets can be observed in coronal loops and they have been linked to nanoflares. However, while…

太阳与恒星天体物理 · 物理学 2021-12-22 Paolo Pagano , Patrick Antolin , Antonio Petralia