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Researchers offer look into 'central engine' powering a solar flare（图）
Researchers offer look central engine powering solar flare
2020/7/31
In a U.S. National Science Foundation-funded study published in Nature Astronomy, an international team of researchers has presented a new, detailed look inside the "central engine" of a lar...
中国科学院云南天文台米波太阳射电频谱仪观测到罕见的断裂II型射电暴 首次揭示了CME激波穿越CME/flare电流片的物理过程（图）
太阳射电频谱仪；断裂II型射电暴；flare电流片
2021/11/16
最近，利用云南天文台研制的米波太阳射电频谱仪，高冠男、汪敏和林隽等人观测到一个罕见的具有断裂结构的II型射电暴及其射电精细结构（图1下）。经研究发现，该射电暴的断裂结构源于CME驱动的激波穿越之前CME拉伸出的电流片的物理过程（图2）。利用观测频率与日冕密度的关系，并结合日冕密度模型计算出了激波所在的日冕高度约为1.42 - 1.56 Rsun，激波的速度约为1100 km/s。根据II型射电暴的...
Swift J2058.4+0516: Discovery of a Possible Second Relativistic Tidal Disruption Flare
Swift Possible Second Relativistic idal Disruption Flare
2011/10/17
We report the discovery by the Swift hard X-ray monitor of the transient source Swift J2058.4+0516 (Sw J2058+05). Our multi-wavelength follow-up campaign uncovered a long-lived (duration >~ months), l...
Post-Periastron Gamma Ray Flare from PSR~B1259-63/LS 2883 as a Result of Comptonization of the Cold Pulsar Wind
Comptonization Cold Pulsar Wind
2011/10/19
The recent detection of gamma rays with the {\it Fermi} Large Area Telescope (LAT) from the binary system PSR B1259-63/LS2883 provides unique information about the pulsar wind. Although the nature of ...
MAXI GSC monitoring of the Crab nebula and pulsar during the GeV gamma-ray flare in September 2010
stars: neutron — stars: pulsars: individual (Crab) — X-rays: indi- vidual
2011/10/12
We report on the MAXI GSC X-ray monitoring of the Crab nebula and pulsar during the GeV gamma-ray flare for the period of 2010 September 18-24 (MJD 55457-55463) detected by AGILE and Fermi-LAT. There ...
Height structure of X-ray, EUV and white-light emission in a solar flare
Sun: fl ares – Sun: X-rays, gamma-rays – Sun: radio radiation – Sun: UV radiation – Acceleration of particles
2011/10/11
The bulk of solar flare emission originates from very compact sources located in the lower solar atmosphere and seen in various wavelength ranges: near optical, UV, EUV, soft and hard X-rays, and gamm...
Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations
Oscillations, Solar Radio Emission Radio Bursts, Association with Flares
2011/9/29
The sunspot-associated sources at the frequency of 17 GHz give information on plasma parameters in the regions of magnetic field about B=2000 G at the level of the chromosphere-corona transition regio...
X-ray flare candidates in short gamma-ray bursts
gamma-ray: bursts – radiation mechanism: non-thermal –X-rays
2011/9/30
We present the first systematic study of X-ray flare candidates in short gamma-ray bursts (SGRBs) exploiting the large 6-year Swift database with the aim to constrain the physical nature of such fluct...
Multi-Wavelength Observations of a Flux Rope Failed in the Eruption and Associated M-Class Flare from NOAA AR 11045
coronal loops magnetic eld ux rope magnetic reconnection
2011/9/27
We present the multi-wavelength observations of a flux rope that was trying to erupt from NOAA AR 11045 and the associated M-class solar flare on 12 February 2010 using space and ground based observat...
VLBI imaging of a flare in the Crab Nebula: More than just a spot
ISM:supernova remnants —radio continuum:stars— pulsars:general —pulsars:individual:Crab pulsar
2011/9/26
We report on very long baseline interferometry (VLBI) observations of the radio emission from the inner region of the Crab Nebula, made at 1.6 GHz and 5 GHz after a recent high-energy flare in this ob...
Context: Hard X-rays from solar flares are an important diagnostic of particle acceleration and transport in the solar atmosphere. Any observed X-ray flux from on-disc sources is composed of direct em...
Solar Flares and Coronal Mass Ejections: A Statistically Determined Flare Flux-CME Mass Correlation
Flares Coronal mass ejections
2010/11/9
In an effort to examine the relationship between flare flux and corresponding CME mass, we temporally and spatially correlate all X-ray flares and CMEs in the LASCO and GOES archives from 1996 to 2006...
New Interactive Solar Flare Modeling and Advanced Radio Diagnostics Tools
corona Sun magnetic fields radiation mechanisms non-thermal
2010/11/9
The coming years will see routine use of solar data of unprecedented spatial and spectral resolution, time cadence, and completeness in the wavelength domain. To capitalize on
the soon to be availabl...
Post-flare evolution of AR 10923 with Hinode/XRT
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/5
Flares are dynamic events which involve rapid changes in coronal magnetic topology end energy release. Even if they may be localized phenomena, the magnetic disturbance at their origin may propagate a...
Flare induced penumbra formation in the sunspot of NOAA 10838
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/24
We have observed formation of penumbrae on a pore in the active region NOAA10838 using Dunn Solar Telescope at NSO,Sunpot,USA. Simultaneous observations using different instruments (DLSP,UBF,Gband and...