Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994cemda..59..375s&link_type=abstract
Celestial Mechanics and Dynamical Astronomy (ISSN 0923-2958), vol. 59, no. 4, p. 375-387
Astronomy and Astrophysics
Astronomy
2
Celestial Mechanics, Cosmic Dust, Orbits, Poynting-Robertson Effect, Solar Radiation, Astronomical Models, Equations Of Motion, Kepler Laws, Legendre Functions, Lorentz Force, Numerical Integration
Scientific paper
The Kelperian motion of dust particles in the solar system is mainly influenced by the electromagnetic and plasma Poynting-Robertson drag. The first force is isotropic while the second one shows latitudinal variations due to the observed differences of the solar wind parameters in the ecliptic plane and over the solar poles. Close to the Sun other effects become important, e.g. sublimation and sputtering, as well as for submicron particles Lorentz scattering has to be taken into account. These forces are very weak for dust grains of moderate size (10-100 microns) not too close (greater than 0.03 AU) to the Sun and are neglected here. Assuming that the general form of the latitudinally dependent force is a series expansion in Legendre polynomials, we have studied the averaged equations of motion for the classical elements and found the first integral of them. The general character of motion is the same as for the classical Poynting-Robertson drag: particles spiral towards the Sun. The new features in the orbital evolution under the latitudinally dependent force as compared with the isotropic Poynting-Robertson drag are: (1) not only the semimajor axis a and the eccentricity epsilon but also the argument of the perihelion omega varies with time, (2) the rate of change of a, epsilon, omega depends on the inclination. An example of particle trajectories in the phase space of elements is presented.
Banaszkiewicz Marek
Scherer Klaus
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