Evolution of magnetic field fluctuations in high-speed solar wind streams: Ulysses and Helios observations

Details Evolution of magnetic field fluctuations in high-speed solar wind streams: Ulysses and Helios observations Evolution of magnetic field fluctuations in high-speed solar wind streams: Ulysses and Helios observations

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10615929h&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A8, p. 15929-15940

Physics

Plasma Physics

32

Interplanetary Physics: Energetic Particles, Heliospheric, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Mhd Waves And Turbulence, Space Plasma Physics: Turbulence

Scientific paper

Ulysses magnetic field measurements in high-speed streams emanating from the Sun's polar coronal holes reveal a complex combination of fluctuations on different scales. Measurements of the wavenumber dependence of radial and latitudinal power scaling, spectral index, and anisotropy of undisturbed polar magnetic field fluctuations between 1.4 and 4.1 astronomical units (AU) are presented. These results confirm earlier work and reveal the presence of three populations: structures at large scales, Alfvén waves at intermediate scales, and turbulent fluctuations at the smallest scales. A significant decrease in power with latitude, as a result of overexpansion of polar coronal holes, has consequences for energetic particle diffusion coefficients. Other results, in particular those related to field magnitude variations, are not well understood at this time. A similar analysis of magnetic field fluctuations in high-speed streams at low heliolatitudes between 0.3 and 1 AU, measured by the Helios spacecraft, shows consistency with Ulysses measurements, suggesting a common origin for fluctuations in all high-speed streams.

Affiliated with

Also associated with

No associations

Rating

Evolution of magnetic field fluctuations in high-speed solar wind streams: Ulysses and Helios observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Evolution of magnetic field fluctuations in high-speed solar wind streams: Ulysses and Helios observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of magnetic field fluctuations in high-speed solar wind streams: Ulysses and Helios observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-801796