Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Red and Blueshifts in Multi-stranded Coronal Loops: A New Temperature
  Diagnostic   Based on observations from the EUV Imaging Spectrometer (EIS) on board
Hinode, the existence of a broad distribution of blue and red Dopplershift in
active region loops has been revealed; the distribution of Dopplershifts
depends on the peak temperature of formation of the observed spectral lines. To
reproduce those observations, we use a nanoflare heating model for
multi-stranded coronal loops (Sarkar and Walsh 2008, 2009) and a set of
spectral lines covering a broad range of temperature (from 0.25 MK to 5.6 MK).
We first show that red- and blueshifts are ubiquitous in all wavelength ranges;
redshifts/downflows dominating cool spectral lines (from O V to Si VII) and
blueshifts/upflows dominating the hot lines (from Fe XV to Ca XVII). These
Dopplershifts are indicative of plasma condensation and evaporation. By
computing the average Dopplershift, we derive a new temperature diagnostic for
coronal loops: the temperature at which the average Dopplershift vanishes
estimates the mean temperature of the plasma along the coronal loop and at the
footpoints. To compare closely with observations, we model dense and sparse
Hinode/EIS rasters at the instrument resolution. The temperature diagnostic
provides the same temperature estimates as the model whatever the type of
raster or the viewing angle. To conclude, we have developed a robust
temperature diagnostic to measure the plasma temperature of a coronal loop
using a broad range of spectral lines.

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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph