E-Print Archive

There are 4559 abstracts currently viewable.


Advanced Search
Main Page Add New E-Print Submitter
News Help/FAQ About Preferences
Manage Key Phrase
SOHO/CDS and Ground Based Observations of a Two-Ribbon Flare:Spatially Resolved Signatures of Chromospheric Evaporation View all abstracts by submitter

Ambretta Falchi   Submitted: 2003-01-20 06:46

During a coordinated observing campaign (SOHO JOP 139), we obtained simultaneous spectroheliograms of a solar active region in several spectral lines, sampling levels from the chromosphere to the corona. Ground based spectroheliograms were acquired at the Dunn Solar Tower of NSO/Sacramento Peak in four chromospheric lines, while the Coronal Diagnostic Spectrograph (CDS) aboard SOHO was used to obtain rasters of the active region in transition region (TR) and coronal lines. Such a complete dataset allowed us to compare the development of intensity and velocity fields during a small two-ribbon flare in the whole atmosphere. In particular, we obtained for the first time quasi-simultaneous and spatially resolved observations of velocity fields during the impulsive phase of a flare, both in chromosphere and upper atmosphere. In this phase, strong downflows (up to 40 km s-1) following the shape of the developing ribbons are measured at chromospheric levels, while strong upward motions are instead measured in TR (up to -100 km s-1) and coronal lines (-160 km s-1). The spatial pattern of these velocities have a common area about 10 arcsec wide. This is the first time that opposite directed flows at different atmospheric levels are observed in the same spatial location during a flare. These signatures are highly suggestive of the chromospheric evaporation scenario predicted in theoretical models of flares.

Authors: Teriaca, L., Falchi, A., Cauzzi, G., Falciani, R., Smaldone, L.A. and Andretta, V.

Publication Status: Accepted by ApJ
Last Modified: 2003-01-20 06:46
Go to main E-Print page  Why current-carrying magnetic flux tubes gobble up plasma and become thin as a result  A New Solar Flare Scenario: High-beta Plasma Disruption  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
Comparison of solar activity proxies: eigenvectors versus averaged sunspot numbers
A comparative study of resistivity models for simulations of magnetic reconnection in the solar atmosphere
Links of Terrestrial Volcanic Eruptions to Solar Activity and Solar Magnetic Field
Periodicities in Solar Activity, Solar Radiation and Their Links with Terrestrial Environment
Transverse vertical oscillations during the contraction and expansion of coronal loops
New Evidence on the Origin of Solar Wind Microstreams/Switchbacks
The Merging of a Coronal Dimming and the Southern Polar Coronal Hole
Complete replacement of magnetic flux in a flux rope during a coronal mass ejection
The SunPy Project: An Interoperable Ecosystem for Solar Data Analysis
Evidence of external reconnection between an erupting mini-filament and ambient loops observed by Solar Orbiter/EUI
Ultra-high-resolution Observations of Persistent Null-point Reconnection in the Solar Corona
The Evolution of Plasma Composition During a Solar Flare
The efficiency of electron acceleration during the impulsive phase of a solar flare
Evolution of Solar Eruptive Events: Investigating the Relationships Among Magnetic Reconnection, Flare Energy Release, and Coronal Mass Ejections
Solar Radio Spikes and Type IIIb Striae Manifestations of Sub-second Electron Acceleration Triggered by a Coronal Mass Ejection
Statistical study of Type III bursts and associated HXR emissions
On orbit performance of the solar flare trigger for the Hinode EUV Imaging Spectrometer
Plasma Composition Measurements in an Active Region from Solar Orbiter/SPICE and Hinode/EIS
Modulation of cosmic ray anti-protons in the heliosphere: simulations for a solar cycle
Temporal and spatial association between microwaves and type III bursts in the upper corona

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