What I mean by this question is as follows:
We know that the growth/rise phase of solar flare components (Soft X-rays, Hard X-rays) is always associated with the solar radio type III burst and conconcurrent radio flux density. According to some space scientists and also we can see clearly, the type III burst extended over longer solar longitude, which is often consistent with the decay phase of the low energy (Soft X-ray of longer wavelength) flare component, indicating that it goes up to several thousands of kilometers in the IP medium. However, the radiated energy emitted from the decay phase is distributed over a long time indicating that the energy by shock wave perhaps is much more than the energy distributed by the decay phase of the solar flare component. To overcome the confusion on whether flare decay phase or shock wave is dominant in the interplanetary medium, it is important to determine the speed of the decay phase of the Soft X-ray components. I am looking for suggestion on this particular issue to determine the speed of the soft X-ray flux intensity (w/m^2).
What do you mean by "speed of the soft X-ray flux intensity (w/m^2)"?
Is this "The Speed distribution of flare plasma in the flare loops which produces such emission?"
Well. In that case, what you could do is
1. Estimate the temperature and emission measure from X-ray observations from RHESSI and/or SDO/AIA observation for your event of interest. Temperature estimated from Soft X-ray spectral fitting may become a proxy for speed of plasma giving rise to such emission.
2. If you have some doppler information available from Hinode/ Ground-based line spectroscopic observations (H-alpha line +bands), you could also find a proxy to the speed.
I hope you get an idea to start with. Type III may be well connected to non-thermal electrons however, you are more dealing with Soft X-ray emission which is originated mainly from thermal pool of the plasma.
Thanks for your concern. You said well.
I understand what you said. However, do you know anybody practically did such thing?
When you have Temperature (MK) and Thermal emission, what equation would you suppose to use to determine plasma speed?
Exact speed is not necessary. Proxy speed is enough.
With the assumption of maxwellian speed distribution only, such Temperature and emission measures are derived from observed flare spectra. Thus temperature derived will be able to give thermal average speed of plasma. Are you looking for this speed or plasma upflow/downflow speed during the flare? because for that, doppler shift in line observation will be the quantity to look at.
Hi Kazi,
you need to segregate your observation to understand the type of emisssion (thermal vs non thermal for example).
Once this is done, you need to infer the particle fluxes responsible for these emissions but it gets tricky depending on the transport model you are assuming, and there is a clear signature of return currents which will saturate your emission for large flares.
From the particle distribution functions, you can infer energies and speeds and integrate depending on the physical characteristics you are interested in.
You can review some of the papers on my page to better understand this or follow the procedure we normally do.
I can help you with your analytical and numerical models if you want.
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