Talk:The Jakimiec Track

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Revision as of 18:05, 6 March 2009 by Schriste (Talk | contribs)
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RHESSI Microflares

RHESSI microflares are mentioned but one of the main results from that study has not. With RHESSI microflares, tt was found that no correlation existed between EM and T. The figure is below (click on the figure for the figure caption).

Microflare EMT.png

RHESSI does have its fair share of instrumental biases especially when looking at the smallest events but they are probably smaller than for other fixed energy range instruments so I, personally, trust the RHESSI result more. Of course, physically speaking no correlation does not make a lot of sense.

--Schriste 19:47, 2 March 2009 (UTC)

Interpreting the RHESSI microflares - ?

Thanks, this figure probably should have been in the main Nugget. The plus signs mark the Battaglia flare/microflare sample from RHESSI, and the gray scale shows the huge RHESSI database of 25,000 microflares. Beautiful data! As noted, the RHESSI points don't fall on the Feldman line, but definitely hotward and/or at lower EM than they should. In this sense they are a step away from the Feldman line in the opposite sense that the stellar flares are distinct. What is this telling us? I am wondering if this gross departure might not be a good thing to associate with scaling laws, rather than the trend lines within given data sets. Certainly those can be affected by observational selection, and Markus points out that the Hausdorff dimensionality of the process is consistent as well.

In any case, the weakest events are just a disorganized blur. I assume that this region is entirely dominated by the systematic errors. RHESSI's mean photon energy is of order 6 keV, whereas the flare temperatures are below 2 keV in this region. Hence the exponential factor of the free-free cross-section is down by at least a factor of e-3 ~ 1/20. That's a strong selection.


--Hhudson 23:42, 3 March 2009 (UTC)

selection

I agree that selection affects may play a dominant role at around 10 MK but what about above that? Taking the microflare results and combining them with the Battaglia results (which also show little or no correlation and agree well with the microflare results) seems to suggest that we can be more confident that there is little or no correlation between EM and T at these energies.

--Schriste 18:05, 6 March 2009 (UTC)

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