Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29s..19l&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 19, pp. 19-1, CiteID 1913, DOI 10.1029/2001GL014152
Astronomy and Astrophysics
Astrophysics
5
Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds
Scientific paper
We have observed intensity scintillation (IPS) of the radio source 0854 + 201 at 8 GHz on August 2, 2000 during the passage of a coronal mass ejection (CME) across the line of sight. The source was at a distance of 10 Rsolar over the north solar pole. Simultaneous observations with the LASCO C3 instrument allow us to model the mean density Ne and the microscale density fluctuations δNe within the CME. We find that Ne increased by a factor of 2.18 but δNe increased by only 1.76, so the ratio δNe/Ne is 19% smaller than in the pre-CME slow wind. During the passage of the CME a short burst of enhanced turbulence doubled the IPS variance but was not visible in the C3 images. This was likely caused by a thin flux tube crossing the line of sight. Detailed modeling indicates that the diameter of the tube was 41,000 km and its density was 14.5 times the CME density.
Coles William A.
Lynch Benjamin J.
Sheeley Neil R.
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