E-Print Archive

There are 4257 abstracts currently viewable.


Advanced Search
Main Page Add New E-Print Submitter
News Help/FAQ About Preferences
Manage Key Phrase
* News 04/04/20 * The archive is using a new backend database. This has thrown up a few SQL errors in the last few days. If you have any issues please email adavey@nso.edu with either the number of eprint you are trying to edit or a link to your preprint.

Imaging and spectral study on the null point of a fan-spine structure during a solar flare View all abstracts by submitter

Shuhong Yang   Submitted: 2020-05-19 20:00

'Using the multi-instrument observations, we make the first simultaneous imaging and spectral study on the null point of a fan-spine magnetic topology during a solar flare. When magnetic reconnection occurs at the null point, the fan-spine configuration brightens in the (extreme-)ultraviolet channels. In the Hα images, the fan-spine structure is partly filled and outlined by the bi-directional material flows ejected from the reconnection site. The extrapolated coronal magnetic field confirms the existence of the fan-spine topology. Before and after the flare peak, the total velocity of the outflows is estimated to be about 60 km s-1. During the flare, the Si IV line profile at the reconnection region is enhanced both in the blue-wing and red-wing. At the flare peak time, the total velocity of the outflows is found to be 144 km s-1. Superposed on the Si IV profile, there are several deep absorption lines with the blueshift of several tens of km s-1. The reason is inferred to be that the bright reconnection region observed in Si IV channel is located under the cooler material appearing as dark features in the Hα line. The blueshifted absorption lines indicate the movement of the cooler material toward the observer. The depth of the absorption lines also depends on the amount of cooler material. These results imply that this kind of spectral profiles can be used as a tool to diagnose the properties of cooler material above reconnection site.'

Authors: Shuhong Yang, Qingmin Zhang, Zhi Xu, Jun Zhang, Ze Zhong, Yang Guo
Projects: GOES X-rays,Hinode/SOT,IRIS,New Vacuum Solar Telescope (NVST),SDO-AIA,SDO-HMI

Publication Status: Accepted for publication in ApJ
Last Modified: 2020-05-20 12:12
Go to main E-Print page  f-mode strengthening from a localized bipolar subsurface magnetic field  Forecasting Solar Cycle 25 Using Deep Neural Networks  Edit Entry  Download Preprint  Delete Entry 

Go to main E-Print pageGo to main E-Print page.
Previous AbstractPrevious Abstract.
Next AbstractNext Abstract.
Download PreprintDownload Preprint.
Submitter's HomepageSubmitters Homepage.
Edit EntryEdit Entry.
View All Abstracts By SubmitterView all abstracts by submitter.
Delete AbstractDelete abstract.

Latest Entries
The origin of quasi-periodicities during circular ribbon flares
Sensitivity to luminosity, centrifugal force, and boundary conditions in spherical shell convection
An Eruptive Circular-ribbon Flare with Extended Remote Brightenings
Additivity of relative magnetic helicity in finite volumes
3D propagation of relativistic solar protons through interplanetary space
Heating Rates for Protons and Electrons in Polar Coronal Holes: Empirical Constraints from the Ultraviolet Coronagraph Spectrometer
Comparison of Enhanced Absorption in He I 10830 in Observations and Modeling During the Early Phase of a Solar Flare
Radio Echo in the Turbulent Corona and Simulations of Solar Drift-Pair Radio Bursts
Solar Flare Arcade Modelling: Bridging the gap from 1D to 3D Simulations of Optically Thin Radiation
Dynamics of Late-Stage Reconnection in the 2017 September 10 Solar Flare
Polarisation and source structure of solar stationary type IV radio bursts
Statistical Analysis of the Relation between Coronal Mass Ejections and Solar Energetic Particles
Magnetic Flux of Active Regions Determining the Eruptive Character of Large Solar Flares
Case study of multi-temperature coronal jets for emerging flux MHD models
The STIX Aspect System (SAS): The Optical Aspect System of the Spectrometer/Telescope for Imaging X-Rays (STIX) on Solar Orbiter
What determine Solar Flares Producing Interplanetary Type III Radio Bursts?
Ambipolar diffusion in the Bifrost code
Modeling the quiet Sun cell and network emission with ALMA
Clustering of fast Coronal Mass Ejections during the solar cycles 23 and 24 and implications for CME-CME interactions
Magnetic and Velocity Field Topology in Active Regions of Descending Phase of the Solar Cycle 23

Related Pages
MSU Solar Physics.
Max Millennium Science Mail Archive.
Max Millennium Message of the Day Mail Archive.
Max Millennium Flare Catalog

Archive Maintainer
Alisdair Davey

© 2000-2020 Solar Physics Group - Montana State University