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Solar wind speed and coronal flux-tube expansion
Abstract
The hypothesis that the solar wind speed at 1 AU and the rate of magnetic flux-tube expansion in the corona are inversely correlated is shown to be consistent with observations extending over the last 22 years. This empirical relationship allows the daily wind speeds at earth to be predicted from a current-free extrapolation of the observed photospheric field into the corona. The narrow boundaries of high-speed wind streams are attributed to steep gradients in the flux-tube expansion rates at the edges of coronal holes. When a heliospheric current sheet is included in the model, it is found that the flux tubes near the hole axis, although diverging more slowly than those near the hole boundary in the corona, have undergone the greatest net expansion at 1 AU, an effect consistent with the low densities within high-speed streams.
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Citations
Cited by
The Heliospheric Magnetic Field
Owens, M. J., & Forsyth, R. J. (2013) · Living Reviews in Solar Physics · doi:10.12942/lrsp-2013-5 · Cited by 263
The Origin, Early Evolution and Predictability of Solar Eruptions
Green, L. M., Török, T., Vršnak, B., Manchester, W., & Veronig, A. (2018) · Space Science Reviews · doi:10.1007/s11214-017-0462-5 · Cited by 258
Stellar winds on the main-sequence: II. The evolution of rotation and winds
Johnstone, C. P., Güdel, M., Brott, I., & Lüftinger, T. (2015) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201425301 · Cited by 229
On space weather consequences and predictions
Feynman, J., & Gabriel, S. B. (2000) · Journal of Geophysical Research: Space Physics · doi:10.1029/1999ja000141 · Cited by 153
A GRID OF MHD MODELS FOR STELLAR MASS LOSS AND SPIN-DOWN RATES OF SOLAR ANALOGS
Cohen, O., & Drake, J. J. (2014) · The Astrophysical Journal · doi:10.1088/0004-637x/783/1/55 · Cited by 57
Metadata
- Authors
- Wang, Y.-M., & Sheeley, N. R., Jr.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1990-06
- Volume
- 355
- Pages
- 726
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2037981626
- Cited by
- 892
- References
- 0
- FWCI
- 11.81
- Type
- journal article
- Language
- en
- Open access
- closed
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- Wang, Y.-M., & Sheeley, N. R., Jr. (1990). Solar wind speed and coronal flux-tube expansion. The Astrophysical Journal. https://doi.org/10.1086/168805
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