Radial evolution of the power spectral density of the magnetic field from 0.3 to 0.9 AU

Details Radial evolution of the power spectral density of the magnetic field from 0.3 to 0.9 AU Radial evolution of the power spectral density of the magnetic field from 0.3 to 0.9 AU

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh43c1958b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH43C-1958

Physics

[2159] Interplanetary Physics / Plasma Waves And Turbulence

Scientific paper

The power spectra of the magnetic field from 0.29 to about 0.9 AU using Helios 2 spacecraft measurements is analyzed. It is known that, at distance of 1 AU from the Sun, the scale corresponding to the break frequency fb and the Doppler- shifted proton scales are all close to f ˜ 0.5Hz. However, the radial evolution of the power spectra studied here gives the possibility to distinguish between those scales. In this study we show that fb varies in a tiny interval [0.2,0.4] along the distance R. Also, when we assume parallel propagating (with respect to the solar wind flow or to the background magnetic field) fluctuations we find that none of the proton scales is following the spectral break scale. However, taking into account the 2-dimensional nature of turbulent fluctuations, we show that scale corresponding to fb(R) follows λ p(R) and not the fcp(R) or ρ p(R) along the heliocentric distance. These observations may indicate that the spectral break at the high frequency range might be controlled by the Hall effect or by the onset of the ion dissipation due to 2D magnetic reconnection near the ion skin depth scale.

Affiliated with

Also associated with

No associations

Rating

Radial evolution of the power spectral density of the magnetic field from 0.3 to 0.9 AU 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 Radial evolution of the power spectral density of the magnetic field from 0.3 to 0.9 AU, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radial evolution of the power spectral density of the magnetic field from 0.3 to 0.9 AU will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-879780