E-Print Archive

There are 4620 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
SUMER observations of the inverse Evershed eff ect in the transition region above a sunspot View all abstracts by submitter

Luca Teriaca   Submitted: 2008-11-28 03:43

Aims. We analyse SUMER spectral scans of a large sunspot within active region NOAA 10923, obtained on 14-15 November 2006, to determine the morphology and dynamics of the sunspot atmosphere at di fferent heights/temperatures. Methods. The data analysed here consist of spectroheliograms in the continuum around 142.0 nm and in the Si IV 140.2 nm, O III 70.3 nm, N IV 76.5 nm, and O IV 79.0 nm spectral lines. Gaussian-fitting of the observed profiles provides line-of-sight velocity and Doppler-width maps. Results. The data show an asymmetric downflow pattern compatible with the presence of the inverse Evershed flow in a region within roughly twice the penumbral radius at transition-region temperatures up to 0.18 MK. The motions, highly inhomogeneous on small scales, seem to occur in a collar of radially directed filamentary structures, with an average width less than the 1 Mm spatial resolution of SUMER and characterised by different plasma speeds. Assuming that the flows are directed along the field lines, we deduce that such field lines are inclined by 10 to 25 degrees with respect to the solar surface.

Authors: Teriaca L., Curdt W., Solanki S.K.
Projects: SoHO-SUMER

Publication Status: Published as a Letter on A&A volume 491, Issue 2, 2008, pp L5-L8
Last Modified: 2008-11-28 11:21
Go to main E-Print page  On the validity of nonlinear Alfven resonance in space plasmas  Reconnection in Three Dimensions: The Role of Spines in Three Eruptive Flares   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
High-altitude Spider-type Prominence above the Magnetic Null Point
Non-Neutralized Electric Currents as a Proxy for Eruptive Activity in Solar Active Regions
Formation and Dynamics in an Observed Preeruptive Filament
Unveiling the spectacular over 24-hour flare of star CD-36 3202
The centroid speed as a characteristic of the group speed of solar coronal fast magnetoacoustic wave trains
Coronal dimmings as indicators of early CME propagation direction
A Chromatic Treatment of Linear Polarization in the Solar Corona at the 2023 Total Solar Eclipse
MinXSS-2 CubeSat mission overview: Improvements from the successful MinXSS-1 mission
Small Satellite Mission Concepts for Space Weather Research and as Pathfinders for Operations
Study of Time Evolution of Thermal and Nonthermal Emission from an M-class Solar Flare
Achievements and Lessons Learned From Successful Small Satellite Missions for Space Weather-Oriented Research
Scaling of Electron Heating by Magnetization During Reconnection and Applications to Dipolarization Fronts and Super-Hot Solar Flares
Defining the Middle Corona
First Results for Solar Soft X-Ray Irradiance Measurements from the Third-generation Miniature X-Ray Solar Spectrometer
Deciphering the solar coronal heating: Energizing small-scale loops through surface convection
Using Potential Field Extrapolations to Explore the Origin of Type II Spicules
Phase mixed Alfvén waves in partially ionised solar plasmas
Terrestrial temperature, sea levels and ice area links with solar activity and solar orbital motion
A model of failed solar eruption initiated and destructed by magnetic reconnection
Energetics of a solar flare and a coronal mass ejection generated by a hot channel eruption

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