Short-Period Magnetic Fluctuations in Advanced Composition Explorer Solar Wind Data: Evidence for Anticorrelation with Alfvén Speed

Details Short-Period Magnetic Fluctuations in Advanced Composition Explorer Solar Wind Data: Evidence for Anticorrelation with Alfvén Speed Short-Period Magnetic Fluctuations in Advanced Composition Explorer Solar Wind Data: Evidence for Anticorrelation with Alfvén Speed

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...583..496m&link_type=abstract

The Astrophysical Journal, Volume 583, Issue 1, pp. 496-505.

Astronomy and Astrophysics

Astronomy

8

Interplanetary Medium, Magnetohydrodynamics: Mhd, Sun: Solar Wind

Scientific paper

Short-period rms fluctuations δBrms in the interplanetary magnetic field have been derived from Advanced Composition Explorer/MAG data for 50 solar rotations between 1998 and 2001. We find that in many cases, individual maxima in δBrms are associated with local minima in the Alfvén speed VAlf. To determine whether this anticorrelation persists in large data sets, we compute the correlation coefficient between the temporal gradients (in the spacecraft frame) δBrms and VAlf for each of the 50 solar rotations in the data set. We find that, in 48 of the 50 rotations, δBrms is anticorrelated with VAlf. The confidence level of the anticorrelation is greater than 90% in 35 rotations and is greater than 99.95% in 14 rotations. We find that in some low-VAlf regions of solar wind, there is a pronounced enhancement of non-Alfvénic (compressive) fluctuations. We suggest that refraction effects operating on MHD waves contribute to these aspects of the magnetic field fluctuation properties of the solar wind.

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