E-Print Archive

There are 3835 abstracts currently viewable.


Search:

Advanced Search
Options
Main Page Add New E-Print Submitter
Information
Feedback
News Help/FAQ About Preferences
Manage Key Phrase
Notification
Observations of Electron-driven Evaporation during a Flare Precursor View all abstracts by submitter

Dong Li   Submitted: 2018-01-22 18:34

We investigate the relationship between the blue shifts of a hot emission line and the nonthermal emissions in microwave and hard X-ray (HXR) wavelengths during the precursor of a solar flare on 2014 October 27. The flare precursor is identified as a small but well-developed peak in soft X-ray and extreme-ultraviolet passbands before the GOES flare onset, which is accompanied by a pronounced burst in microwave 17 & 34 GHz and HXR 25-50 keV. The slit of Interface Region Imaging Spectrograph (IRIS) stays at one ribbon-like transient during the flare precursor, where shows visible nonthermal emissions in NoRH and RHESSI images. The IRIS spectroscopic observations show that the hot line of Fe XXI 1354.09 Å (logT ~ 7.05) displays blue shifts, while the cool line of Si IV 1402.77 Å (logT ~ 4.8) exhibits red shifts. The blue shifts and red shifts are well correlated to each other, indicative of an explosive chromospheric evaporation during the flare precursor particularly combining with a high nonthermal energy flux and a short characteristic timescale. In addition, the blue shifts of Fe XXI 1354.09 Å are well correlated with the microwave and HXR emissions, implying that the explosive chromospheric evaporation during the flare precursor is driven by nonthermal electrons.

Authors: Dong Li, Ying Li, Wei Su, Yu Huang, Zongjun Ning
Projects: IRIS

Publication Status: accept by the Astrophysical Journal
Last Modified: 2018-01-23 11:52
Go to main E-Print page  Influence of misalignments on the performance of externally occulted solar coronagraphs. Application to PROBA-3/ASPIICS  The ?FIP Effect? and the Origins of Solar Energetic Particles and of the Solar Wind  Edit Entry  Download Preprint  Delete Entry 

Key
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
Statistical Properties of Ribbon Evolution and Reconnection Electric Fields in Eruptive and Confined Flares
Unambiguous Evidence of Filament Splitting-Induced Partial Eruptions
On the Origin of the Double-cell Meridional Circulation in the Solar Convection Zone
Modelling Quasi-Periodic Pulsations in Solar and Stellar Flares
Diffusive transport of energetic electrons in the solar corona: X-ray and radio diagnotics
Plasma evolution within an erupting coronal cavity
Identification of multiple hard X-ray sources in solar flares: A Bayesian analysis of the February 20 2002 event
Flux Rope Breaking and Formation of a Rotating Blowout Jet
On-Orbit Performance of the Helioseismic and Magnetic Imager Instrument onboard the Solar Dynamics Observatory
Two-Phase Heating in Flaring Loops
Evidence For The Magnetic Breakout Model in an Equatorial Coronal-Hole Jet
Spontaneous flux concentrations from the negative effective magnetic pressure instability beneath a radiative stellar surface
Powerful Solar Flares of September 2017: Correspondence Between Parameters of Microwave Bursts and Proton Fluxes near Earth
Evaluation of Applicability of a Flare Trigger Model based on Comparison of Geometric Structures
Coronal hole evolution from multi-viewpoint data as input for a STEREO solar wind speed persistence model
Formation and Dynamics of a Solar Eruptive Flux Tube
The Instruments and Capabilities of the Miniature X-ray Solar Spectrometer (MinXSS) CubeSats
Fine Structures of Solar Radio Type III Bursts and their Possible Relationship with Coronal Density Turbulence
Influence of misalignments on the performance of externally occulted solar coronagraphs. Application to PROBA-3/ASPIICS
Observations of Electron-driven Evaporation during a Flare Precursor

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



© 2003 Solar Physics Group - Montana State University