The magnetohydrodynamic turbulent cascade in polar solar wind: the role of local dynamic alignment

Details The magnetohydrodynamic turbulent cascade in polar solar wind: the role of local dynamic alignment The magnetohydrodynamic turbulent cascade in polar solar wind: the role of local dynamic alignment

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh53a..03s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH53A-03

Physics

Plasma Physics

[2149] Interplanetary Physics / Mhd Waves And Turbulence, [4490] Nonlinear Geophysics / Turbulence, [7863] Space Plasma Physics / Turbulence

Scientific paper

In recent years the occurrence of magnetohydrodynamic (MHD) turbulent cascade has been validated in the solar wind. This has been done through the systematic observation of the exact scaling law of the mixed third order moment of the Elsasser variables, also known as Politano and Pouquet law. The scaling was observed in the ecliptic and in polar wind, the properties of the cascade depending on the local wind conditions, such as cross-helicity. In polar fast, Alfvénic wind measured by Ulysses spacecraft the observation of the turbulent cascade is not ubiquitous, the reason for this sporadic behavior being unknown so far. After a brief review of the main results obtained in this framework, we show that occurrence of cascade is related with the local properties of the velocity and magnetic field fluctuations. In particular, the alignment of the fields inhibits the nonlinear interactions, as suggested in the early 80' (dynamic alignment), whilst the cascade takes place when the alignment is locally perturbed. Dependence of the cascade rate with radial distance, latitude and solar activity is presented, corroborating the importance of local dynamic alignment, and confirming the non universal character of solar wind MHD turbulence.

Affiliated with

Also associated with

No associations

Rating

The magnetohydrodynamic turbulent cascade in polar solar wind: the role of local dynamic alignment 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 The magnetohydrodynamic turbulent cascade in polar solar wind: the role of local dynamic alignment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The magnetohydrodynamic turbulent cascade in polar solar wind: the role of local dynamic alignment will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1512179