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Solar wind plasma parameter variability across solar cycles 23 and 24 : from turbulence to extremes
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Tindale, Elizabeth and Chapman, Sandra C. (2017) Solar wind plasma parameter variability across solar cycles 23 and 24 : from turbulence to extremes. Journal of Geophysical Research : Space Physics . doi:10.1002/2017ja024412
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WRAP-solar-wind-plasma-parameter-variability-across-solar-Tindale-2017.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2948Kb) | Preview |
Official URL: http://doi.org/10.1002/2017ja024412
Abstract
Solar wind variability spans a wide range of amplitudes and timescales, from turbulent fluctuations to the 11 year solar cycle. We apply the data quantile-quantile (DQQ) method to NASA/Wind observations spanning solar cycles 23 and 24, to study how the uniqueness of each cycle maximum and minimum manifests in the changing statistical distribution of plasma parameters in fast and slow solar wind. The DQQ method allows us to discriminate between two distinct components of the distribution: the core region simply tracks the solar cycle in its moments but shows little sensitivity to solar wind state or the specific activity of each cycle. This would be consistent with an underlying in situ process such as turbulence driving the evolution of fluctuations up to an outer scale. In contrast, the tail component of the distribution is sensitive both to the differences between the maxima and minima of cycles 23 and 24, and the fast or slow state of the solar wind. The tail component varies over the solar cycle in such a way as to maintain a constant functional form, with only its moments varying with solar activity. Finally, after isolating the core region of the distribution, we test its lognormality over the solar cycle in each solar wind state and find the lognormal provides a more robust description of the statistics in slow wind than fast; however, in both states the goodness of fit is significantly reduced at solar maximum.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||||
| Divisions: | Faculty of Science > Physics | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Library of Congress Subject Headings (LCSH): | Solar cycle, Solar wind | ||||||
| Journal or Publication Title: | Journal of Geophysical Research : Space Physics | ||||||
| Publisher: | Wiley-Blackwell Publishing Ltd. | ||||||
| ISSN: | 2169-9380 | ||||||
| Official Date: | 17 October 2017 | ||||||
| Dates: |
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| DOI: | 10.1002/2017ja024412 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Publisher Statement: | ** From Crossref via Jisc Publications Router. | ||||||
| Access rights to Published version: | Open Access | ||||||
| Funder: | Science and Technology Facilities Council (Great Britain) (STFC), United States. Air Force. Office of Scientific Research (AFOSR) | ||||||
| Grant number: | ST/N504506/1 (STFC), FA9550-17-1-0054 (AFOSR) | ||||||
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