E-Print Archive

There are 3989 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
First Detection of Solar Flare Emission in Middle-Ultraviolet Balmer Continuum  

Marie Dominique   Submitted: 2018-10-24 01:59

We present the first detection of solar flare emission at middle-ultraviolet wavelengths around 2000 A by the channel 2 of the Large-Yield RAdiometer (LYRA) onboard the PROBA2 mission. The flare (SOL20170906) was also observed in the channel 1 of LYRA centered at the H I Lyman-α line at 1216 Å, showing a clear non-thermal profile in both channels. The flare radiation in channel 2 is consistent with the hydrogen Balmer continuum emission produced by an optically thin chromospheric slab heated up to 10000 K. Simultaneous observations in channels 1 and 2 allow the separation of the line emission (primarily from the Lyman-α line) from the Balmer continuum emission. Together with the recent detection of the Balmer continuum emission in the near-ultraviolet by IRIS, the LYRA observations strengthen the interpretation of broadband flare emission as the hydrogen recombination continua originating in the chromosphere.

Authors: Marie Dominique, Andrei N. Zhukov, Petr Heinzel, Ingolf E. Dammasch, Laurence Wauters, Laurent Dolla, Sergei Shestov, Matthieu Kretzschmar, Janet Machol, Giovanni Lapenta, Werner Schmutz
Projects: PROBA2/LYRA

Publication Status: Accepted in ApJL
Last Modified: 2018-10-24 10:42
Go to main E-Print page  Edit Entry  Download Preprint  Delete Entry 

The LYRA Instrument Onboard PROBA2: Description and In-Flight Performance  

Marie Dominique   Submitted: 2013-02-26 11:26

The Large Yield Radiometer (LYRA) is an XUV-EUV-MUV (soft X-ray tomid-ultraviolet) solar radiometer onboard the European Space AgencyPROBA2 mission that was launched in November 2009. LYRA acquires solarirradiance measurements at a high cadence (nominally 20 Hz) in fourbroad spectral channels, from soft X-ray to MUV, that have been chosenfor their relevance to solar physics, space weather and aeronomy. Inthis article, we briefly review the design of the instrument, give anoverview of the data products distributed through the instrumentwebsite, and describe the way that data are calibrated. We alsobriefly present a summary of the main fields of research currentlyunder investigation by the LYRA consortium.

Authors: M. Dominique, J.-F. Hochedez, W. Schmutz, I.E. Dammasch, A.I. Shapiro, M. Kretzschmar, A.N. Zhukov, D. Gillotay, Y. Stockman, A. BenMoussa
Projects: PROBA2/LYRA

Publication Status: Solar Physics (published)
Last Modified: 2013-02-26 15:39
Go to main E-Print page  Edit Entry  Download Preprint  Delete Entry 


Key
Go to main E-Print pageGo to main E-Print page.
Download PreprintDownload Preprint.
Submitter's HomepageSubmitters Homepage.
Edit EntryEdit Entry.
Delete AbstractDelete abstract.

Abstracts by Author
First Detection of Solar Flare Emission in Middle-Ultraviolet Balmer Continuum
The LYRA Instrument Onboard PROBA2: Description and In-Flight Performance

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