Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.8809s&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #88.09; Bulletin of the American Astronomical Society, Vol. 33, p.1434
Astronomy and Astrophysics
Astronomy
Scientific paper
We have made Very Long Baseline Interferometer (VLBI) observations of radio sources close to the Sun. For the sources discussed here, the lines of sight passed from 17 Rsun to 26 Rsun from the Sun. We have measured the temporal fluctuations in the interferometer phase due to solar wind turbulence. We have fit the measured phase power spectra with theoretical models, and extracted values for the speed at which the irregularities move with respect to the antennas. These speeds range from 190 to 340 kilometers per second, and are consistent with bulk solar wind speeds deduced from LASCO coronagraph observations. The derived speeds are lower than the sum of the bulk solar wind flow speed and the Alfvén speed, as would be expected if the irregularities are associated with outwardly-propagating Alfvén waves. The significance of this result for models of solar wind turbulence will be discussed. This research was supported by the NSF through grant ATM99-86887.
Kortenkamp Peter Simon
Mutel Robert L.
Spangler Steven R.
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