Abstract
We investigate the nature of turbulent magnetic dissipation in the solar wind. We employ a database describing the spectra of over 800 intervals of interplanetary magnetic field and solar wind measurements recorded by the ACE spacecraft at 1 AU. We focus on the spectral properties of the dissipation range that forms at spacecraft frequencies ≥0.3 Hz and show that while the inertial range at lower frequencies displays a tightly constrained range of spectral indexes, the dissipation range exhibits a broad range of power-law indexes. We show that the explanation for this variation lies with the dependence of the dissipation range spectrum on the rate of energy cascade through the inertial range such that steeper spectral forms result from greater cascade rates.
| Original language | English |
|---|---|
| Pages (from-to) | L85-L88 |
| Journal | Astrophysical Journal |
| Volume | 645 |
| Issue number | 1 II |
| DOIs | |
| State | Published - Jul 1 2006 |
| Externally published | Yes |
Funding
The authors thank the ACE SWEPAM team for providing thermal proton data. C. W. S. and K. H. are funded by Caltech subcontract 44A-1062037 to the University of New Hampshire in support of the ACE MAG instrument. B. J. V. is supported by the NASA Sun-Earth Connection Theory Program under grant NNG05GL40G and the NASA SR&T program under grant NNG06GB36G to the University of New Hampshire.
Keywords
- MHD
- Solar wind
- Turbulence
- Waves