Study of the magnetic turbulence in a corotating interaction region in the interplanetary medium
We study the geometry of magnetic fluctuations in a CIR observed by Pioneer 10 at 5 AU between days 292 and 295 in 1973. We apply the methodology proposed by Bieber <i>et al.</i> to make a comparison of the relative importance of two geometric arrays of vector propagation of the magn...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
1999-11-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/17/1361/1999/angeo-17-1361-1999.pdf |
| Summary: | We study the geometry of magnetic
fluctuations in a CIR observed by Pioneer 10 at 5 AU between days 292 and 295 in
1973. We apply the methodology proposed by Bieber <i>et al.</i> to make a
comparison of the relative importance of two geometric arrays of vector
propagation of the magnetic field fluctuations: slab and two-dimensional (2D).
We found that inside the studied CIR this model is not applicable due to the
restrictions imposed on it. Our results are consistent with Alfvenic
fluctuations propagating close to the radial direction, confirming
Mavromichalaki <i>et al.</i>'s findings. A mixture of isotropic and
magnetoacoustic waves in the region before the front shock would be consistent
with our results, and a mixture of slab/2D and magnetoacoustic waves in a region
after the reverse shock. We base the latter conclusions on the theoretical
analysis made by Kunstmann. We discuss the reasons why the composite model can
not be applied in the CIR studied although the fluctuations inside it are two
dimensional.<br><br><b>Key words.</b> Solar physics · astrophysics and astronomy
(magnetic fields) · Space plasma physics (turbulence; waves and instabilities) |
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| ISSN: | 0992-7689 1432-0576 |