Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh11c..02s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH11C-02
Astronomy and Astrophysics
Astrophysics
[2134] Interplanetary Physics / Interplanetary Magnetic Fields, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle
Scientific paper
Ulysses results indicate that the total magnetic flux inside the heliosphere, Φ, can be obtained from the radial field component measured at a single spacecraft multiplied by the square of the radial distance and averaged over a solar rotation, < BR r2>. This result is contrary to a large increase in Φ with distance, called the Flux Excess published in the JGR by Owens et al. (2008) and by Lockwood et al. (2009a,b) who attribute it to variations in solar wind speed. Ulysses data and a mathematical simulation are used to show that the Flux Excess is caused by replacing BR with the modulus, |BR|. The modulus rectifies the large amplitude magnetic field variations normally present in measurements of BR and increases the mean of < |BR| r2> relative to < BR r2>. The variance of the magnetic fluctuations decreases less rapidly with distance than BR and produces a progressively larger error in < |BR| r2> resulting in the Flux Excess. The advisability of defining Φ in terms of |BR|, of using < |BR| r2> beyond 1 AU and the applicability of the Lockwood et al. (2009) proposed correction to the Flux Excess are questioned.
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