Loading...
Please wait, while we are loading the content...
Similar Documents
Radial evolution of power spectra of interplanetary alfvenic turbulence
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dobrowolny, M. Bavassano, B. Ness, N. F. Mariani, F. |
| Copyright Year | 1981 |
| Description | The radial evolution of the power spectra of the MHD turbulence within the trailing edge of high speed streams in the solar wind was investigated with the magnetic field data of Helios 1 and 2 for heliocentric distance between 0.3 and 0.9 AU. In the analyzed frequency range (.00028 Hz to .0083 Hz) the computed spectra have, near the Earth, values of the spectral index close to that predicted for an incompressible hydromagnetic turbulence in a stationary state. Approaching the Sun the spectral slope remains unchanged for frequencies f or approximately .00 Hz, whereas at lower frequencies, a clear evolution toward a less steep fall off with frequency is found. The radial gradient of the power in Alfvenic fluctuations depends on frequency and it increases upon increasing frequency. For frequencies f or approximately .00 Hz, however, the radial gradient remains approximately the same. Possible theoretical implications of the observational features are discussed. |
| File Size | 1506244 |
| Page Count | 29 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820010223 |
| Archival Resource Key | ark:/13960/t20c9s55q |
| Language | English |
| Publisher Date | 1981-09-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Interplanetary Medium Helios 2 Plasma Turbulence Radial Distribution Power Spectra Gyrofrequency Solar Wind Magnetohydrodynamic Stability Helios 1 Interplanetary Magnetic Fields Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
