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The crossover to the "1/f" region of solar wind fluctuations
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Nicol, R. M., Chapman, Sandra C. and Dendy, R. O. (2010) The crossover to the "1/f" region of solar wind fluctuations. In: 12th International Solar Wind Conference, St Milo, France, June 21-26, 2009. Published in: AIP Conference Proceedings, Vol.1216 pp. 643-647. ISBN 978-0-7354-0759-6. doi:10.1063/1.3395948 ISSN 0094-243X.
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Official URL: http://dx.doi.org/10.1063/1.3395948
Abstract
We present generalized structure function (GSF) analysis of magnetic and velocity field fluctuations measured in situ in the solar wind at similar to 1 AU with the ACE spacecraft. We decompose the fluctuations into directions parallel and perpendicular to the mean local background magnetic field. GSF plots based on these quantities are shown to provide a clear indicator of the spectral break between the inertial range and "1/f" range of scaling. In GSF plots, the projected velocity and magnetic field fluctuations track each other closely in the inertial range in both fast and slow solar wind and at solar maximum and minimum. At longer timescales the "1/f" range is easily identified, because the magnetic field fluctuations display a flattening of the GSFs (exponents become zero) consistent with a similar to 1/f PSD. The velocity fluctuations on the other hand have GSFs which steepen, consistent with a PSD of similar to 1/f(alpha) where alpha as determined by GSF varies with solar wind speed and solar cycle but is closer to two. The extent of the inertial range determined in this manner differs between fast and slow solar wind streams, and between periods of maximum and minimum solar activity.
| Item Type: | Conference Item (UNSPECIFIED) | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Series Name: | AIP Conference Proceedings | ||||
| Journal or Publication Title: | AIP Conference Proceedings | ||||
| Publisher: | American Institute of Physics | ||||
| ISBN: | 978-0-7354-0759-6 | ||||
| ISSN: | 0094-243X | ||||
| Editor: | Maksimovic, M and Issautier, K and MeyerVernet, N and Moncuquet, M and Pantellini, F | ||||
| Official Date: | 2010 | ||||
| Dates: |
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| Volume: | Vol.1216 | ||||
| Number of Pages: | 5 | ||||
| Page Range: | pp. 643-647 | ||||
| DOI: | 10.1063/1.3395948 | ||||
| Status: | Not Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Title of Event: | 12th International Solar Wind Conference | ||||
| Type of Event: | Conference | ||||
| Location of Event: | St Milo, France | ||||
| Date(s) of Event: | June 21-26, 2009 |
Data sourced from Thomson Reuters' Web of Knowledge
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