Issue |
A&A
Volume 415, Number 2, February IV 2004
|
|
---|---|---|
Page(s) | 777 - 780 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361:20031716 | |
Published online | 11 February 2004 |
The influence of meteoroid rotation on the diffraction characteristics of underdense radio-meteors
1
Novgorod State University, Great Novgorod, Russia
2
Astronomical Institute of the Academy of Sciences of the Czech Republic, 251 65 Ondřejov, Czech Republic
Corresponding author: P. Pecina, ppecina@asu.cas.cz
Received:
13
December
2001
Accepted:
2
December
2003
We discuss the problem of meteor plasma formation and
consequently of radio-wave scattering from an ionized meteor trails
produced by rotating meteoroids. The problem is solved under the following
approximations: the meteoroid is represented by a cube, its rotation axis
is perpendicular to the velocity vector, meteoroid deceleration can be
neglected, the only acting ablation mechanism is the evaporation, the
deionization effects are negligibly small. In this case the ambipolar
diffusion approximation applies, and, supposing that the source of free
electrons is known, the distribution of free electrons inside a trail,
, considered as a function of position and time, can be
computed. It is shown that the electron distribution along a trail axis
oscillates, which is not the case with respect to the radial distribution.
The function
found is then used for the solution of the
problem of the scattering of radio-waves on the underdense-type
trails produced by rotating particles. The values for amplitude-time as
well as phase-time characteristics computed under the above assumptions
differ only very slightly from those computed when meteoroid rotation is
not taken into consideration.
Key words: meteors, meteoroids
© ESO, 2004
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