Juan C. Vallejo, GMV/XMM-Newton

Profile
========

MS. Science in Astrophysics (1994), DEA (2002), Ph.D. (nearly finished).

Working at,
        - ESAC, since 1999, with GMV Aerospace and Defence, in
          Satellite Control Centers Division (MOC, FDS, SOC).
        - University Rey Juan Carlos, since 2002, within the
          Physics Department, as Partial Time Professor.

Science Interests
=================

Astrophysics and Non Linear Dynamics.
Orbit instability, mainly through finite time lyapunov exponents.

Research lines
=================

(Old) SFR at the local Universe, by surveying H-alpha excess galaxies.

(Current) Chaoticity indicators in hamiltonian potentials, mainly
          applied to,

        a) Galactic potentials (mainstream research line).
                Studying the local Instability in the Henon-Heiles
                potential and three-dimensional generalisations
                (barred potentials and triaxial systems).
                One of the goals of the Chaos theory applied to
                galactic dynamics is the identification of the sets
                of chaotic and regular orbits as constructive
                blocks for the observed structures. The finite time
                lyapunov exponents provide insight both into the
                local and global properties of the dynamical flow,
                allowing the classification of the regular and
                chaotic regions, as well as the applicable
                timescales.
        b) MHD, planetary magnetic fields (spin-off research line).
                The developed techniques are being applied to basic
                plasmoids models and planetary magnetic fields
                models in order to detect fractal structures and
                global/local unstable regions. These are directly
                related to areas with more or less population of
                certain ions.
        c) Fluid-flows (somehow stagnated research line). Study of
                an adhoc hamiltonian model for modeling the flow
                around a static/rotating cylinder in order to
                observe how the chaotic structures on its wake were
                modified by the rotation.

Main article
============
Vallejo, J.C, Aguirre, J., SanJuan, M.A.F., Characterization of the
local instability in the Henon-Heiles Hamiltonian, Phys. Let. A,
311, 26, (2003).