On magnetic fluctuation spectra in the solar wind and the influence of mode dispersion

PDF Version Also Available for Download.

Description

Magnetic fluctuation power spectra in the solar wind are commonly observed to have a power-law form with a spectral index s = 5/3 at frequencies lower than about 1 Hz. This characteristic feature of magnetic fluctuation spectra defines what is called the inertial range and may be described, in wavenumber space, by Kolmogorov diffusion. For higher frequencies, it has been suggested that collisionless damping of Alfven and magnetosonic waves leads to steeper power-laws; this regime is sometimes labeled as the dissipation range. Here we argue, based on numerical calculations, that it is more likely that the observed steeper power-laws result ... continued below

Physical Description

4 p.

Creation Information

Gary, S. Peter; Stawicki, O. (Olaf) & Li, H. (Hui) January 1, 2001.

Context

This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

Who

People and organizations associated with either the creation of this article or its content.

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this article. Follow the links below to find similar items on the Digital Library.

Description

Magnetic fluctuation power spectra in the solar wind are commonly observed to have a power-law form with a spectral index s = 5/3 at frequencies lower than about 1 Hz. This characteristic feature of magnetic fluctuation spectra defines what is called the inertial range and may be described, in wavenumber space, by Kolmogorov diffusion. For higher frequencies, it has been suggested that collisionless damping of Alfven and magnetosonic waves leads to steeper power-laws; this regime is sometimes labeled as the dissipation range. Here we argue, based on numerical calculations, that it is more likely that the observed steeper power-laws result from an increase in the wavenumber diffusion rate caused by whistler-like dispersion than from collision-less damping. The calculations lead to the prediction, that this broken power-law feature of magnetic fluctuation spectra is only observable in low-{beta}{sub p} plasmas.

Physical Description

4 p.

Source

  • "Submitted to: International Cosmic Ray Conference 2001, Hamburg, Germany, August 2001"

Language

Item Type

Identifier

Unique identifying numbers for this article in the Digital Library or other systems.

  • Report No.: LA-UR-01-2964
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975356
  • Archival Resource Key: ark:/67531/metadc929605

Collections

This article is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this article?

When

Dates and time periods associated with this article.

Creation Date

  • January 1, 2001

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

Description Last Updated

  • Dec. 12, 2016, 6:49 p.m.

Usage Statistics

When was this article last used?

Congratulations! It looks like you are the first person to view this item online.

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Gary, S. Peter; Stawicki, O. (Olaf) & Li, H. (Hui). On magnetic fluctuation spectra in the solar wind and the influence of mode dispersion, article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc929605/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.