Solar cycle changes in the level of compressive microturbulence near the Sun

Details Solar cycle changes in the level of compressive microturbulence near the Sun Solar cycle changes in the level of compressive microturbulence near the Sun

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10017069c&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A9, p. 17069-17080

Astronomy and Astrophysics

Astrophysics

20

Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Plasma Waves And Turbulence, Interplanetary Physics: Solar Cycle Variations, Solar Physics, Astrophysics, And Astronomy: Corona

Scientific paper

Observations of the coherence bandwidth of interplanetary scintillations (IPS) made at the Nançay Radio Observatory between 1982 and 1992 have been used to estimate the variance of electron density δN2e at solar distances of 5 to 15 Rs. These IPS observations are sensitive to scales of the order of 10 km; i.e., they measure the ``microscale variance,'' which is a small fraction of the total density variance. Measurements in the equatorial region are invariant over the solar activity cycle and show the same behavior with distance as the mean density, i.e., δN2e~N2e. They do not show a statistically significant change in the ``transonic region'' as reported by other observers (Lotova et al., 1985). Measurements over the polar region show a clear variation with the solar cycle. At solar maximum, δN2e is invariant with latitude, as is Ne (Withbroe, 1988). However, the apparent δN2e measured by IPS is about 10 times lower in the polar streams which form during the declining and minimum phases of solar activity. Compensation for the line of sight integration inherent in the IPS observations indicates that the local value of δN2e is actually about 15 times lower in the polar streams. We cannot estimate the latitude variation of the ``development'' of the compressive turbulence δNe/Ne between 5 and 15 Rs because measurements of Ne in the polar hole are lacking.

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