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From: Ehud Behar <behar@milkyway.gsfc.nasa.gov>
Subject: chromoshperic evaporation
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To: Rosario Gonzalez Riestra <xmmhelp@sciops.esa.int>
From: Ehud Behar <behar@milkyway.gsfc.nasa.gov>
Subject: chromoshperic evaporation
Date: Fri, 27 Jun 2008 11:44:24 -0400
Dear Rosario,

I am writing in response to the last XMM newsletter and the request  
to call your
attention to significant science results coming from XMM.

The work I think is significant is by a student of mine and myself.

http://adsabs.harvard.edu/abs/2008A%26A...482..639N

Using the RGS and EPIC, we measured the change in abundances in a  
sample of 8 large coronal flares;
(together with 6 flares from Chandra) this is the best sample ever of  
coronal flares observed at high
spectral resolution.
The most exciting result coming out of this paper is the evidence for  
chromospheric evaporation,
meaning the abundances in the flares always tend to those of the  
chromosphere
(that can differ from that of the quiet corona in different ways).
This is a fundamental result contributing to our understanding of how  
coronal flares work,
both in stars and on the Sun.
It complements the timing analysis and discovery of the Neupert  
effect by XMM on one of these
flares reported by Gudel et al. 2002

http://adsabs.harvard.edu/abs/2002ApJ...577..371G

I think - together - the two papers really highlight XMM's capability  
to study stellar flares
at very high energy (EPIC) and measure abundances at high resolution  
(RGS).
These flares are akin to the solar flares responsible for coronal  
mass ejections,
magnetic communication interference on earth, and the magnificent  
aurora at our poles.

I can easily write up a short popular paragraph on these results i  
there is interest.

Regards,
Ehud

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