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We present a study of flare rates, rotation periods, and spectroscopic activity indicators of 125 single stars within 15 parsecs and with masses between 0.1$-$0.3 $M_\odot$ observed during the first year of the TESS mission, with the goal…

太阳与恒星天体物理 · 物理学 2021-01-06 Amber A. Medina , Jennifer G. Winters , Jonathan M. Irwin , David Charbonneau

The shape of an RF pulse is distorted upon propagating through an X-band accelerator structure due to dispersive effects. This distortion together with beam loading introduce energy spread between 192 bunches. In order to minimize this…

加速器物理 · 物理学 2008-11-26 R. M. Jones , V. A. Dolgashev , R. H. Miller , C. Adolphsen , J. W. Wang

In this article, we measure the mean magnetic shear from the morphological evolution of flare ribbons, and examine the evolution of flare thermal and non-thermal X-ray emissions during the progress of flare reconnection. We analyze three…

太阳与恒星天体物理 · 物理学 2022-07-20 Jiong Qiu , Jianxia Cheng

The first simultaneous observations of the Fe XVIII 974.86 {\AA} and Fe XX 721.56 {\AA} forbidden lines from the Spectral Imaging of the Coronal Environment (SPICE) spectrograph on Solar Orbiter are presented. The lines were observed from…

太阳与恒星天体物理 · 物理学 2025-05-02 Peter R. Young , Andrew R. Inglis , Graham S. Kerr , Therese A. Kucera , Daniel F. Ryan

Based on Kepler data, we present the results of a search for white-light flares on 1049 close binaries. We identify 234 flare binaries, on which 6818 flares are detected. We compare the flare-binary fraction in different binary morphologies…

太阳与恒星天体物理 · 物理学 2016-06-22 Qing Gao , Yu Xin , Ji-Feng Liu , Xiao-Bin Zhang , Shuang Gao

We present SDO/AIA observations of an eruptive X-class flare of July 12, 2012, and compare its evolution with the predictions of a 3D numerical simulation. We focus on the dynamics of flare loops that are seen to undergo slipping…

太阳与恒星天体物理 · 物理学 2015-06-18 Jaroslav Dudík , Miho Janvier , Guillaume Aulanier , Giulio Del Zanna , Marian Karlický , Helen Mason , Brigitte Schmieder

Tsinghua University-Ma Huateng Telescopes for Survey (TMTS) aims to detect fast-evolving transients in the Universe, which has led to the discovery of thousands of short-period variables and eclipsing binaries since 2020. In this paper, we…

Radio-bright BL Lacertae objects (BLOs) are typically variable and exhibit prominent flaring. We use a sample of 24 BLOs to get a clear idea of their flaring behavior and to find possible commonalities in their variability patterns. Our…

宇宙学与河外天体物理 · 物理学 2014-11-20 E. Nieppola , T. Hovatta , M. Tornikoski , E. Valtaoja , M. F. Aller , H. D. Aller

On 2011 September 6, we observed an X2.1-class flare in continuum and H$\alpha$ with a frame rate of about 30~Hz. After processing images of the event by using a speckle-masking image reconstruction, we identified white-light (WL) flare…

太阳与恒星天体物理 · 物理学 2016-12-14 Tomoko Kawate , Takako T. Ishii , Yoshikazu Nakatani , Kiyoshi Ichimoto , Ayumi Asai , Satoshi Morita , Satoshi Masuda

The analysis of narrowband drifting of type III-like structures in radio bursts dynamic spectra allows to obtain unique information about primary energy release mechanisms in solar flares. The SSRT spatially resolved images and a high…

太阳与恒星天体物理 · 物理学 2015-06-05 N. S. Meshalkina , A. T. Altyntsev , D. A. Zhdanov , S. V. Lesovoi , A. A. Kochanov , Yan Yihua , Tan Chengming

Circular-ribbon flares (CFs) are a special type of solar flares owing to their particular magnetic topology. In this paper, we conducted a comprehensive statistical analysis of 134 CFs from 2011 September to 2017 June, including four…

太阳与恒星天体物理 · 物理学 2022-05-25 Yanjie Zhang , Qingmin Zhang , Dechao Song , Shuting Li , Jun Dai , Zhe Xu , Haisheng Ji

We present multispectral analysis (radio, H$\alpha$, UV/EUV, and hard X-ray) of a confined flare from 2015 March 12. This flare started within the active region NOAA 12 297 and then it expanded into a large preexisting magnetic rope…

太阳与恒星天体物理 · 物理学 2021-01-22 Alena Zemanová , Marian Karlický , Jana Kašparová , Jaroslav Dudík

The light curves of solar flares in the impulsive phase are complex in general, indicating that multiple physical processes are involved in. With the GOES (Geostationary Operational Environmental Satellite) observations, we find that there…

太阳与恒星天体物理 · 物理学 2015-06-16 HAN , Fei-ran , LIU , Si-ming

We use high spatial and temporal resolution observations from the Swedish Solar Telescope to study the chromospheric velocities of a C-class flare originating from active region NOAA 10969. A time-distance analysis is employed to estimate…

太阳与恒星天体物理 · 物理学 2015-05-27 Peter H. Keys , David B. Jess , Mihalis Mathioudakis , Francis P. Keenan

Although more than 5000 TESS Objects of Interest have been cataloged, no comprehensive survey of the flare rates of their host stars exists. We perform the first flare survey of all 2250 non-retired TOIs with 2 min cadence light curves to…

太阳与恒星天体物理 · 物理学 2022-03-14 Ward S. Howard

The Interface Region Imaging Spectrometer (IRIS) is the first solar instrument to observe $\sim 10$ MK plasma at subarcsecond spatial resolution through imaging spectroscopy of the Fe XXI $\lambda$1354.1 forbidden line. IRIS observations of…

太阳与恒星天体物理 · 物理学 2015-06-23 Peter Young , Hui Tian , Sarah Jaeggli

The timing of 503 solar flares observed simultaneously in hard X-rays, soft X-rays and H-alpha is analyzed. We investigated the start and the peak time differences in different wavelengths, as well as the differences between the end of the…

天体物理学 · 物理学 2015-06-24 A. Veronig , B. Vrsnak , M. Temmer , A. Hanslmeier

Using high temporal and high spatial resolution observations taken by the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory, we present the detailed observational analysis of a high quality quasi-periodic fast- propagating…

太阳与恒星天体物理 · 物理学 2018-01-31 Yuandeng Shen , Yu Liu , Tengfei Song , Zhanjun Tian

We detect rapid downflows of 150-217 km/s in IRIS Si IV 1402.77 nm measurements of an X9-class solar flare on 2024 October 3rd. The fast redshift values persist for over 15 minutes from flare onset, and can be split into two distinct stages…

Fast Radio Bursts (FRBs), are millisecond radio signals that exhibit dispersion larger than what the Galactic electron density can account for. We have conducted a 1446 hour survey for Fast Radio Bursts (FRBs) at 145~MHz, covering a total…