000005359 001__ 5359
000005359 005__ 20210528130035.0
000005359 0247_ $$2DOI$$a10.1007/s11207-021-01814-4
000005359 037__ $$aSCART-2021-0097
000005359 100__ $$aLemaire, Joseph
000005359 245__ $$aRadial Distributions of Coronal Electron Temperatures: Specificities of the DYN Model
000005359 260__ $$c2021
000005359 520__ $$aThis paper is a follow up of the article where Lemaire & Stegen (2016) introduced their DYN method to calculate coronal temperature profiles from given radial distributions of the coronal and solar wind (SW) electron densities. Several such temperature profiles are calculated and presented corresponding to a set of given empirical density models derived from eclipse observations and in-situ measurements of the electron density and bulk velocity at 1 AU. The DYN temperature profiles obtained for the equatorial and polar regions of the corona challenge the results deduced since 1958 from singular hydrodynamical models of the SW. In these models - where the expansion velocity transits through a singular saddle point - the maximum coronal temperature is predicted to be located at the base of the corona, while in all DYN models the altitude of the maximum temperature is found at significantly higher altitudes in the mid-corona.  Furthermore, the maximum of the DYN-estimated temperatures is found at much higher altitudes over the polar regions and coronal holes, than over the equator.  However, at low altitudes, in the inner corona, the DYN temperatures are always smaller at high latitudes, than at low equatorial latitudes. This appears well in agreement with existing coronal hole observations. These findings have serious implications on the open questions: what is the actual ource of the coronal heating, and where is the maximum energy deposited within the solar corona?
000005359 594__ $$aSTCE
000005359 6531_ $$aCorona; Inner Corona, Models; Solar Wind; Solar Wind, Theory; Electron Density; Electron Temperature; Coronal Heating; Velocity Fields, Solar Wind
000005359 700__ $$aKatsiyannis, Athanassios
000005359 773__ $$c64$$n4$$pSolar Physics$$v296$$y2021
000005359 8560_ $$fthanassis.katsiyannis@observatoire.be
000005359 8564_ $$s1697453$$uhttp://publi2-as.oma.be/record/5359/files/Lemaire-Katsiyannis2021_Article_RadialDistributionsOfCoronalEl.pdf
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000005359 905__ $$apublished in
000005359 980__ $$aREFERD