Tim Thompson
Muse
- Joined
- Dec 2, 2008
- Messages
- 969
171 Angstroms & the Solar Photosphere & Chromosphere
Like I said before, "thinness" is irrelevant.
Like I said before, it's the optical depth that counts.
You may be right, maybe some will get through. But you may also be wrong and none of it will get through. I don't know because I don't know the absorption coefficient for the photosphere at that wavelength, and I am guessing that if you knew it, you would have said so by now. The absorption coefficient plus the optical path length will determine the optical depth, and that will determine how much of what gets through. I know that I don't know those numbers, and the evidence indicates that you don't know those numbers either, in which case neither you nor I know how much of the 171 Angstrom photons will get through.
Like I said before, neither you nor I "know" any such thing.You and I both know darn well that highly energetic 171a photons will penetrate *SOME* distance through a light plasma atmosphere.
Like I said before, "thinness" is irrelevant.
Like I said before, it's the optical depth that counts.
You may be right, maybe some will get through. But you may also be wrong and none of it will get through. I don't know because I don't know the absorption coefficient for the photosphere at that wavelength, and I am guessing that if you knew it, you would have said so by now. The absorption coefficient plus the optical path length will determine the optical depth, and that will determine how much of what gets through. I know that I don't know those numbers, and the evidence indicates that you don't know those numbers either, in which case neither you nor I know how much of the 171 Angstrom photons will get through.
Who cares about "any" distance? The only distance that counts is "far enough for us to see them"; if they don't get that far, we don't see them. And if none of them get that far, we don't see any, and that's all about the optical depth, not the "thinness" (and nobody knows what "thin" is supposed to mean anyway).We can argue about "how far", but you can't claim it won't go *ANY* distance. The location of the base of the arcs is *ABSOLUTELY* critical to this discussion.
I don't know what image you are talking about, so show me the image or give me a link to same.No you don't. Take a *REALLY* good look at Kosovichev's Doppler image again.
I am not referring to any specific limb measurement (though any example should do), but rather to several decades of limb measurements combined. Not one reported example anywhere of any observation consistent with limb brightening where limb darkening would be expected, or high energy photons where low energy photons would be expected, or of stratification where mixing is expected. See the sections on limb brightening & limb darkening in Foukal's Solar Astrophysics (Wiley-VCH, 2004, 2nd ed.), or the discussion of limb darkening in David F. Gray's The Observation and Analysis of Stellar Photospheres (Cambridge University Press, 2005, 3rd ed.), or the discussion in Arvind Bhatnagar & William Livingston's book Fundamentals of Solar Astronomy (World Scientific, 2005). The NASA/ADS shows 110 papers with limb darkening in the title, and another 89 papers with limb brightening in the title, going back to 1946. It's a significant body of observation, all of it inconsistent with your claims. If you are going to try to re-model the sun, you have a vast array of observations to deal with which you have so far ignored.Which specific limb measurements are you referring to?
Because it is well known & well understood that EUV photons ionize iron. I am unaware of anyone creating Fe IX with an electric discharge. Certainly Fe IX does not occur anywhere naturally on or near Earth, so there is no "natural" (as you misuse the word) process to compare to.Er, how is that a "likely cause", as in "more likely" than say an "electrical discharge"?
Above, created in the chromosphere either as thermal emission, or as line emission from recombining Fe IX.Where did those flying EUV photons come from, above or below the photosphere?
That I don't know, but my guess is that the footpoints of the loops are heated well above the photosphere, in the chromosphere, by impulsive electromagnetic events (magnetic reconnection & nanoflares or perhaps magnetoacoustic waves and/or Alfven waves).Where is the base of the loop heated, and what is the heating mechanism?
What's "magnetic flux" in "magnetic line" supposed to mean? Alfven waves? or magnetoacoustic waves? Those don't come in "photons" but that can be responsible for generating photons by heating a plasma.Are the EUV photons part of this "magnetic flux" in "magnetic line"?
The loop is a magnetic structure where the motion of particles is confined & directed by the magnetic field. That's quite independent of the heating mechanism. The photons are not what do the heating, that comes from a release of magnetic energy at the foot of the loop. That's what generates the photons, and the photons are what ionizes the Fe IX.What powers *ONE* loop and why would it form a loop if it's simply heated by "flying photons"?