Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..409v&link_type=abstract
In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze
Physics
1
Sun: Radio Radiation, Shock Waves, Corona, Interplanetary Medium
Scientific paper
Adopting that the band-splitting of type II bursts is a consequence of the plasma emission from the upstream and downstream shock region, the band-split reveals the shock Mach number. On the other hand, the shock speed can be inferred from the frequency drift. Combining these two parameters the Alfvén velocity and the magnetic field in the ambient plasma can be estimated. The results of such an analysis applied to 44 type II bursts recorded from decimetric to kilometric wavelengths are presented. The inferred magnetic field decreases as R-2 beyond the radial distance of 1.5 solar radii (R > 1.5) if the two-fold Saito density model is applied at R < 10 and Leblanc model beyond R ≍ 30. In that case the Alfvén velocity shows a shallow local minimum of vA ≍ 400 km s-1 at 2 < R < 3 and a broad local maximum of vA ≍ 500 km s-1 at 4 < R < 6.
Aurass Henry
Magdalenic Jasmina
Mann Gottfried
Vrsnak Bojan
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