4,183 Hits in 4.8 sec

Flare Prediction Using Photospheric and Coronal Image Data

Eric Jonas, Monica Bobra, Vaishaal Shankar, J. Todd Hoeksema, Benjamin Recht
2018 Solar Physics  
This is the first attempt to predict solar flares using photospheric vector magnetic field data as well as multiple wavelengths of image data from the chromosphere, transition region, and corona.  ...  Here we attempt to capture the signature of this mechanism in solar image data of various wavelengths and use these signatures to predict flaring activity.  ...  The data used here are courtesy of the GOES team and the NASA/SDO and the HMI and AIA science teams.  ... 
doi:10.1007/s11207-018-1258-9 fatcat:pswgzof6xndbdpbyv3wpqkhcga

Response of Hinode XRT to quiet Sun, active region and flare plasma

B. O'Dwyer, G. Del Zanna, H. E. Mason
2013 Astronomy and Astrophysics  
We examine the response of the Hinode X-Ray Telescope (XRT), using simultaneous observations with the Hinode Extremeultraviolet Imaging Spectrometer (EIS), for a flare, an active region and a quiet Sun  ...  Significant discrepancies between predicted and observed count rates were found and are discussed for the adjacent quiet Sun region and also for the flare.  ...  Observed Predicted Photospheric 1 Photospheric 2 Coronal 1 Coronal 2 Be thick (Flare 1) 4.75 2.80 (-41%) 3.36 (-29%) 2.30 (-52%) 5.91 (+24%) Ti poly (Flare 2) 20781 6493 (-69%) 23184 (+12%  ... 
doi:10.1051/0004-6361/201016346 fatcat:ozfcpdck2najrod5fq5r6gpfea


S. Gosain
2012 Astrophysical Journal  
These observations are consistent with the "coronal implosion" scenario and its predictions about flare related photospheric field changes.  ...  We use high-resolution images of the sun obtained by the SDO/AIA instrument to study the evolution of the coronal loops in a flaring solar active region.  ...  These predictions have been tested in the past using either coronal or photospheric observations separately.  ... 
doi:10.1088/0004-637x/749/1/85 fatcat:jrz7ywymmzhi3pixny7z4ws2vu

Space Weather Related to Solar Eruptions With the ASO-S Mission

Li Feng, Weiqun Gan, Siqing Liu, Huaning Wang, Hui Li, Long Xu, Weiguo Zong, Xiaoxing Zhang, Yaguang Zhu, Haiyan Wu, Anqin Chen, Yanmei Cui (+17 others)
2020 Frontiers in Physics  
The Advanced Space-based Solar Observatory (ASO-S) is a mission aiming at exploring solar flares, coronal mass ejections (CMEs), solar magnetic field and their relationships.  ...  Our particular interests are currently focused on nowcast of different eruption events, prediction of CME arrivals, forecast of solar flares and the onset of solar eruptions.  ...  The near-real-time and high-quality data of ASO-S will be useful to identify active regions, coronal holes, filaments/prominences, and the eruption of flares and CMEs, and to improve the numerical prediction  ... 
doi:10.3389/fphy.2020.00045 fatcat:s5qqawjbczcnbpife4kwtbe7pa

Photospheric and Coronal Abundances in an X8.3 Class Limb Flare

G. A. Doschek, H. P. Warren, L. K. Harra, J. L. Culhane, T. Watanabe, H. Hara
2018 Astrophysical Journal  
We analyze solar elemental abundances in coronal post-flare loops of an X8.3 flare (SOL2017-09-10T16:06) observed on the west limb on 2017 September 10 near 18 UT using spectra recorded by the Extreme-ultraviolet  ...  In some loops of this flare, we find that the abundances appear to be coronal at the loop apices or cusps, but steadily transform from coronal to photospheric as the loop footpoint is approached.  ...  The above results suggest that we still have much to learn about the behavior of ions under the explosive conditions of solar flares.  ... 
doi:10.3847/1538-4357/aaa4f5 fatcat:zdulhbiyuzcnlfgox6jniplwdm

Statistical Study of the Reconnection Rate in Solar Flares Observed withYohkohSXT

Kaori Nagashima, Takaaki Yokoyama
2006 Astrophysical Journal  
We estimate reconnection inflow velocity, coronal Alfven velocity, and reconnection rate using above observed values.  ...  We measure physical parameters of 77 flares, such as the temporal scale, the size, and the magnetic flux density and find that the sizes of flares tend to be distributed more broadly as the GOES class  ...  Data analysis were carried out on the computer system at the Nobeyama Solar Radio Observatory of the National Astronomical Observatory of Japan and the Solar Data Archive (SODA) analysis server at the  ... 
doi:10.1086/505320 fatcat:g3c4fkfjavgy3doeg2tqvvexi4

First Flare-related Rapid Change of Photospheric Magnetic Field Observed by Solar Dynamics Observatory [article]

Shuo Wang, Chang Liu, Rui Liu, Na Deng, Yang Liu, Haimin Wang
2011 arXiv   pre-print
Photospheric magnetic field not only plays important roles in building up free energy and triggering solar eruptions, but also has been observed to change rapidly and permanently responding to the coronal  ...  The Helioseismic and Magnetic Imager instrument (HMI) on board the newly launched Solar Dynamics Observatory (SDO) produces seeing-free full-disk vector magnetograms at consistently high resolution and  ...  and consistent HMI data.  ... 
arXiv:1103.0027v1 fatcat:bv27zwmt5jg3lfvrxx6biml4ju


Ju Jing, Changyi Tan, Yuan Yuan, Benjamin Wang, Thomas Wiegelmann, Yan Xu, Haimin Wang
2010 Astrophysical Journal  
In this study, the photospheric vector magnetograms, obtained with the Spectro-Polarimeter of the Solar Optical Telescope on board Hinode, are used as the boundary conditions to extrapolate the three-dimensional  ...  nonlinear forcefree (NLFF) coronal magnetic fields.  ...  Aimee Norton and Dr. John Britanik for providing SOLIS magnetogram data. SOLIS data is produced cooperatively by NSF/NSO and NASA/LWS. The authors thank Hinode and team for their excellent data set.  ... 
doi:10.1088/0004-637x/713/1/440 fatcat:oxpu45n535ernmik4be4ssorjm

A New View of the Sun with Hinode Mission

Taro SAKAO, Saku TSUNETA, Masumi SHIMOJO, Noriyuki NARUKAGE, Ryouhei KANO, Takahiro OBARA, Shinichi WATARI, Hinode Team
Support for the post-launch operation is provided by JAXA and NAOJ (Japan), STFC (U.K.), NASA, ESA, and NSC (Norway).  ...  Acknowledgements Hinode is a Japanese mission developed and launched by ISAS/JAXA, collaborating with NAOJ as a domestic partner, NASA and STFC (UK) as international partners.  ...  (based on photospheric vector magnetic field data) within our reach.  ... 
doi:10.2322/tstj.7.tr_2_15 fatcat:yhgt2mm4uvds5cn634rf6ud6uu

Rapid changes of sunspot structure associated with solar eruptions

Haimin Wang, Chang Liu
2010 Proceedings of the International Astronomical Union  
These observations provides evidences, either direct or indirect, for the theory and prediction of Hudson, Fisher & Welsch (2008) that the photospheric magnetic fields would respond to coronal field  ...  Using high-resolution Hinode data, we find evidence that only dark fibrils in the "uncombed" penumbral structure disappear while the bright grains evolve to G-band bright points after flares.  ...  required to release energy, and made the prediction that after flares, the photospheric magnetic fields become more horizontal.  ... 
doi:10.1017/s1743921311014943 fatcat:y2t3pronzjfv3o5q2zzo6x2lo4

Structure and evolution of magnetic fields associated with solar eruptions

Haimin Wang, Chang Liu
2015 Research in Astronomy and Astrophysics  
This paper reviews the studies of solar photospheric magnetic field evolution in active regions and its relationship to solar flares.  ...  For the second topic, we concentrate on the observations of rapid and irreversible changes of photospheric magnetic field associated with flares, and the implication on the restructuring of three-dimensional  ...  Liu Other sunspot classifications are also used to describe the size and complexity of ARs related to flare productivity, and therefore have received attention in the usefulness of solar flare prediction  ... 
doi:10.1088/1674-4527/15/2/001 fatcat:uvmhbzh4tnasfpcjylzt6gmsi4

Variations of the 3-D coronal magnetic field associated with the X3.4-class solar flare event of AR 10930

Han He, Huaning Wang, Yihua Yan, P. F. Chen, Cheng Fang
2014 Journal of Geophysical Research - Space Physics  
The coronal magnetic field data are reconstructed from the photospheric vector magnetograms obtained by the Hinode satellite and using the nonlinear force-free field extrapolation method developed in our  ...  The 3-D force-free factor α, 3-D current density, and 3-D magnetic energy density are employed to analyze the coronal data.  ...  Hinode is a Japanese mission developed and launched by ISAS/JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners.  ... 
doi:10.1002/2013ja019157 fatcat:h54hyo6av5hunkuxmzowv2cyxe


Haimin Wang, Chang Liu
2010 Astrophysical Journal Letters  
This observational evidence provides support, either directly or indirectly, for the theory and prediction of Hudson, Fisher & Welsch that the photospheric magnetic fields must respond to coronal field  ...  and present analysis of new events about flare-related changes of photospheric magnetic fields.  ...  required to release energy, and made the prediction that after flares, the photospheric magnetic fields become more horizontal.  ... 
doi:10.1088/2041-8205/716/2/l195 fatcat:had6kesbmjeyrgzj7hsdezuuka

Solar weather monitoring

J.-F. Hochedez, A. Zhukov, E. Robbrecht, R. Van der Linden, D. Berghmans, P. Vanlommel, A. Theissen, F. Clette
2005 Annales Geophysicae  
Space Weather nowcasting and forecasting require solar observations because geoeffective disturbances can arise from three types of solar phenomena: coronal mass ejections (CMEs), flares and coronal holes  ...  They come from space missions and ground observatories and range from sequences of dopplergrams, magnetograms, white-light, chromospheric, coronal, coronagraphic and radio images, to irradiance and in-situ  ...  The authors thank the anonymous referees for their numerous comments and suggestions for improvement. Topical Editor R. J. Forsyth thanks J. M. Kunches and I. G.  ... 
doi:10.5194/angeo-23-3149-2005 fatcat:cwazcpaq4zatthc7n7jhi3q6cy

The Photospheric Vortex Flows during a Solar Flare

Yi Bi, Jiayan Yang, Yunchun Jiang, Junchao Hong, Zhe Xu, Zhining Qu, Kaifang Ji
2017 Astrophysical Journal Letters  
Using observations from the Helioseismic and Magnetic Imager on board the Solar Dynamic Observatory (SDO), we found one counterclockwise and two clockwise vortex flows on the photosphere in the NOAA active  ...  At these vortices, the impulsive and irreversible change in the photospheric vector magnetic field were detected.  ...  The NASA/SDO data used here are courtesy of the HMI and AIA science teams. We dedicate this article to the memory of Professor Yunchun Jiang, who passed away before this manuscript was completed.  ... 
doi:10.3847/2041-8213/aa960e fatcat:vtvs5yi4izfvdkajaavuz5fi6m
« Previous Showing results 1 — 15 out of 4,183 results