This page (revision-23) was last changed on 28-Aug-2023 22:31 by Peter Young

This page was created on 26-Jul-2007 22:00 by Mike Smith

Only authorized users are allowed to rename pages.

Only authorized users are allowed to delete pages.

Page revision history

Version Date Modified Size Author Changes ... Change note
23 28-Aug-2023 22:31 4 KB Peter Young to previous
22 11-Jul-2023 17:09 4 KB akadojewu to previous | to last
21 03-Nov-2016 18:34 6 KB utijeyer to previous | to last

Page References

Incoming links Outgoing links
EisDiscussion
EisDiscussion

Version management

Difference between version and

At line 7 changed one line
Fe XII 195 is a core line and is present in almost every EIS study. It has been noted, however, that there is a subtle contribution of Fe XII 195.18 to the wing of the observed line profile. This component is density senitive and can make an important contribution to the line in active regions. The intensity of this component is generally very small (<15% of the total), it does, however, alter the calculation of the line width and centroid. A two Gaussian fit can be performed on the observed line profile but it is necessary to constrain it. One scheme is to set the line widths of both components to be equal and to fix the difference between the two line centroids to be 0.06 Angstroms. This is not difficult to implement in MPFIT.
Fe XII 195 is a core line and is present in almost every EIS study. It has been noted, however, that there is a subtle contribution of Fe XII 195.18 to the wing of the observed line profile. This component is density sensitive and can make an important contribution to the line in active regions. The intensity of this component is generally very small (<15% of the total), it does, however, alter the calculation of the line width and centroid. A two Gaussian fit can be performed on the observed line profile but it is necessary to constrain it. One scheme is to set the line widths of both components to be equal and to fix the difference between the two line centroids to be 0.06 Angstroms. This is not difficult to implement in MPFIT.
At line 19 added one line
----
At line 21 added one line
!A Comment on the Temperature of Formation for Fe VIII
At line 21 changed one line
----
It has been noted that Fe VIII and Si VII rasters look nearly identical [(Young et al. 2007)|http://adsabs.harvard.edu/abs/2007PASJ...59S.857Y] but the temperature of formation for the two ions are seperated by about 0.2 dex. This image illustrates this by comparing Mg, Si, and Fe images in this temperature range. These data suggest that the Fe VIII and perhaps Fe IX are formed at higher temperatures than suggested by the ionization balance calculations of [Mazzotta et al. (1998)|http://adsabs.harvard.edu/abs/1998A%26AS..133..403M].
At line 25 added 4 lines
[{Image src = 'compare_rasters.jpg' width='600'}]
This page (revision-23) was last changed on 28-Aug-2023 22:31 by Peter YoungTop