5 papers
Non linear regularization for helioseismic inversions. Application for the study of the solar tachocline
T. Corbard, L. Blanc-Feraud, G. Berthomieu +1
Inversions of rotational splittings have shown that there exists at the base of the solar convection zone a region called the tachocline in which high radial gradients of the rotat…
Crashes as Critical Points
Anders Johansen, Olivier Ledoit, Didier Sornette
We study a rational expectation model of bubbles and crashes. The model has two components : (1) our key assumption is that a crash may be caused by local self-reinforcing imitatio…
Atmospheric structure and acoustic cut-off frequency of roAp stars
N. Audard, F. Kupka, P. Morel +2
Some of the rapidly oscillating (CP2) stars, have frequencies which are larger than the theoretical acoustic cut-off frequency. As the cut-off frequency depends on the T(tau) relat…
A Reestimate of the Protosolar 2H/1H ratio from 3He/4He solar wind measurements
D. Gautier, P. Morel
We reanalyze the inference of the protosolar abundance of deuterium made by Geiss (1993) from measurements of 3He/4He in the solar wind. We use an evolutionary solar model with mic…
A Morphological Indicator for Comparing Simulated Cosmological Scenarios with Observations
E. Lega, A. Bijaoui, J. -M. Alimi +1
We propose a morphological multi-scale analysis of large-scale structures obtained by computer simulations and by observations. Structures are obtained at different scales by apply…