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High-mass microquasars are binary systems consisting of a massive star and an accreting compact object from which relativistic jets are launched. There is considerable observational evidence that winds of massive stars are clumpy.…

High Energy Astrophysical Phenomena · Physics 2015-05-13 Anabella T. Araudo , Valenti Bosch-Ramon , Gustavo E. Romero

Solar jets are fast-moving, elongated brightenings related to ejections seen in both images and spectra on all scales from barely visible chromospheric jets to coronal jets extending up to a few solar radii. The largest, most powerful jets…

Solar and Stellar Astrophysics · Physics 2016-12-07 Davina Innes , Radoslav Bucik , Li-Jia Guo , Nariaki Nitta

Prompt gamma-ray burst (GRB) emission requires some mechanism to dissipate an ultrarelativistic jet. Internal shocks or some form of electromagnetic dissipation are candidate mechanisms. Any mechanism needs to answer basic questions, such…

High Energy Astrophysical Phenomena · Physics 2015-05-20 Jonathan C. McKinney , Dmitri A. Uzdensky

Microquasars are potential candidates to produce a non-negligible fraction of the observed galactic cosmic rays. The protons accelerated at the jet termination shock interact with the interstellar medium and may produce detectable fluxes of…

Astrophysics · Physics 2009-11-10 V. Bosch-Ramon , F. A. Aharonian , J. M. Paredes

Jets are observed in young stellar objects, X-ray sources, active galactic nuclei (AGN). The mechanisms of jet formation may be divided in regular, acting continuously for a long time, and explosive ones. Continuous mechanisms are related…

High Energy Astrophysical Phenomena · Physics 2019-05-16 G. S. Bisnovatyi-Kogan

Long duration gamma-ray bursts (GRBs), the brightest events since the Big Bang itself, are believed to originate in an ultra-relativistic jet breaking out from a massive stellar envelope. Despite decades of study, there is still no…

High Energy Astrophysical Phenomena · Physics 2019-04-04 Hirotaka Ito , Jin Matsumoto , Shigehiro Nagataki , Donald C. Warren , Maxim V. Barkov , Daisuke Yonetoku

The term "ultraviolet (UV) burst" is introduced to describe small, intense, transient brightenings in ultraviolet images of solar active regions. We inventorize their properties and provide a definition based on image sequences in…

Numerous apparent signatures of magnetic reconnection have been reported in the solar photosphere, including inverted-Y shaped jets. The reconnection at these sites is expected to cause localised bi-directional flows and extended shock…

Solar and Stellar Astrophysics · Physics 2019-10-02 C. J. Nelson , N. Freij , S. Bennett , R. Erdélyi , M. Mathioudakis

High-mass microquasars are binary systems composed by a massive star and a compact object from which relativistic jets are launched. Regarding the companion star, observational evidence supports the idea that winds of hot stars are formed…

High Energy Astrophysical Phenomena · Physics 2009-08-07 Anabella T. Araudo , Valenti Bosch-Ramon , Gustavo E. Romero

The Fermi and eROSITA bubbles are giant gamma-ray and X-ray lobes in the Milky Way, extending up to $\sim$50{\deg} and ~$\sim$80{\deg} in galactic latitude, respectively, yet their origins remain debated. Using three-dimensional…

High Energy Astrophysical Phenomena · Physics 2026-03-03 Ruiyu Zhang , Fulai Guo , Shaokun Xie , Ruofei Zhang , Shumin Wang , Guobin Mou , Xiaodong Duan

Using high spatial and temporal data from the New Vacuum Solar Telescope (NVST) and the Solar Dynamics Observatory (SDO), we present unambiguous observations of recurrent two-sided loop jets caused by magnetic reconnection between erupting…

Solar and Stellar Astrophysics · Physics 2020-01-08 Bo Yang , Jiayan Yang , Yi Bi , Zhe Xu , Junchao Hong , Haidong Li , Hechao Chen

Jets (transient/collimated plasma ejections) occur frequently throughout the solar corona and contribute mass/energy to the corona and solar wind. By combining numerical simulations and high-resolution observations, we have made substantial…

Solar and Stellar Astrophysics · Physics 2019-03-20 Pankaj Kumar , Judith T. Karpen , Spiro K. Antiochos , Peter F. Wyper , C. Richard DeVore , Craig E. DeForest

Chromospheric brighten and H$\alpha$ surge are the evident and common phenomena along sunspot light bridge. In this paper, a coronal jet ejects from sunspot light bridge is presented. Using the data from the Solar Dynamics Observatory (SDO)…

Solar and Stellar Astrophysics · Physics 2015-06-04 Suo Liu

The $Fermi$ gamma-ray telescope discovered a pair of bubbles at the Galactic center. These structures are spatially-correlated with the microwave emission detected by the WMAP and Planck satellites. These bubbles were likely inflated by a…

High Energy Astrophysical Phenomena · Physics 2015-06-18 M. Ruszkowski , H. -Y. K. Yang , E. Zweibel

Using high-resolution photospheric and chromospheric observations taken by the Goode Solar Telescope (GST), we studied two groups of bidirectional plasma jets occurring in active region NOAA 13110. Supplementary observations are also…

Solar and Stellar Astrophysics · Physics 2026-05-19 Yangyu Liu , Jinhua Shen , Xu Yang , Shuai Gu , Jianping Li , Haisheng Ji

Solar jets are collimated plasma flows moving along magnetic field lines and accelerated at low altitude following magnetic reconnection. Several of them originate from anemone-shaped low-lying arcades and the most impulsive ones tend to be…

Gamma-ray bursts with long durations are widely thought to arise from the collapse of massive stars, where the wind environment is unavoidable. It is also believed that $\gamma$-ray bursts come from jets. Considering these two points in…

Astrophysics · Physics 2009-10-31 L. J. Gou , Z. G. Dai , Y. F. Huang , T. Lu

Solid evidence of magnetic reconnection is rarely reported within sunspots, the darkest regions with the strongest magnetic fields and lowest temperatures in the solar atmosphere. Using the world's largest solar telescope, the 1.6-meter…

Sequential chromospheric brightenings (SCBs) are often observed in the immediate vicinity of erupting flares and are associated with coronal mass ejections. Since their initial discovery in 2005, there have been several subsequent…

Solar and Stellar Astrophysics · Physics 2017-05-24 Michael S. Kirk , K. S. Balasubramaniam , Jason Jackiewicz , Holly R. Gilbert

Solar jets are collimated plasma ejections driven by magnetic reconnection, which play a critical role in the energy release and mass transport in the solar atmosphere. Using Solar Orbiter's Extreme Ultraviolet Imager (EUI) with its…

Solar and Stellar Astrophysics · Physics 2025-09-08 Song Tan , Alexander Warmuth , Frédéric Schuller , Yuandeng Shen , Jake A. J. Mitchell , Fanpeng Shi
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