Results 21 to 30 of about 8,839 (261)

A statistical evaluation of ballistic backmapping for the slow solar wind: The interplay of solar wind acceleration and corotation [PDF]

Monthly Notices of the Royal Astronomical Society, 2021
Abstract Mapping solar wind plasma back to its source is often achieved using the ‘two-step ballistic backmapping’ method. Solar wind observations are mapped through the heliosphere to the edge of a PFSS model, by assuming a constant speed, radial, plasma flow.
Allan R Macneil, Mathew J Owens, Adam J Finley, Sean P Matt   +3 more
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Sulfur Abundance in the Slow Solar Wind [PDF]

The Astronomical Journal, 2007
Using 4 years of data from the Mass Time-of-Flight and Proton Monitor, two CELIAS sensors on board SOHO, we report the sulfur abundances in comparison to magnesium and calcium (two low first ionization potential elements) for the slow solar wind, and for the first time we measure the sulfur isotopic abundance ratio.
Giammanco, Corrado, Wurz, Peter, Opitz, Andrea, Ipavich, Fred, Paquette, John   +4 more
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Observations and Models of the Fast and Slow Solar Wind [PDF]

Symposium - International Astronomical Union, 2001
There are two major types of solar wind. The steady fast wind originating on open magnetic field lines in coronal holes, and the unsteady slow wind coming from the bulk or boundary layer of streamers, which are mostly magnetically closed but may open up temporarily.
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ON THE ORIGIN OF HIGHLY ALFVÉNIC SLOW SOLAR WIND

The Astrophysical Journal, 2015
Alfvenic fluctuations are a common feature in the solar wind and are found especially in the trailing edges of fast wind streams. The slow wind usually has a lower degree of Alfvenicity, being more strongly intermixed with structures of non-Alfvenic nature.
R. D’Amicis, R. Bruno
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Sources of solar wind over the solar activity cycle

Journal of Advanced Research, 2013
Fast solar wind has been recognized, about 40 years ago, to originate in polar coronal holes (CHs), that, since then, have been identified with sources of recurrent high speed wind streams.
Giannina Poletto
doaj   +1 more source

Simultaneous interplanetary scintillation and optical measurements of the acceleration of the slow solar wind [PDF]

Annales Geophysicae, 2000
Simultaneous observations of the slow solar wind off the southeast limb of the Sun were made in May 1999 using optical measurements from the C2 and C3 LASCO coronagraphs on board the SOHO spacecraft and radio-scattering measurements from the MERLIN ...
A. R. Breen, A. R. Breen, A. R. Breen, S. J. Tappin, C. A. Jordan, P. Thomasson, P. J. Moran, R. A. Fallows, A. Canals, P. J. S. Williams   +9 more
doaj   +1 more source

Anisotropy in Fast and Slow Solar Wind Fluctuations

The Astrophysical Journal, 2005
Using 5 years of spacecraft data from near Earth orbit, we investigate the correlation anisotropy of solar wind magnetohydrodynamic-scale fluctuations and show that the nature of the anisotropy differs in fast (>500 km s-1) and slow (
Dasso, Sergio Ricardo, Milano, L. J., Matthaeus, W. H., Smith, C. W.   +3 more
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The Drivers of Active Region Outflows into the Slow Solar Wind [PDF]

The Astrophysical Journal, 2020
Abstract Plasma outflows from the edges of active regions have been suggested as a possible source of the slow solar wind. Spectroscopic measurements show that these outflows have an enhanced elemental composition, which is a distinct signature of the slow wind.
David H. Brooks, Amy R. Winebarger, Sabrina Savage, Harry P. Warren, Bart De Pontieu, Hardi Peter, Jonathan W. Cirtain, Leon Golub, Ken Kobayashi, Scott W. McIntosh, David McKenzie, Richard Morton, Laurel Rachmeler, Paola Testa, Sanjiv Tiwari, Robert Walsh   +15 more
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Alfvénic solar wind intervals observed by Solar Orbiter: Exploiting the capability of the SWA plasma suite and source region investigation

Astronomy & Astrophysics
Context. Fast and slow solar wind have distinct properties linked to their solar sources. The Alfvénic slow wind complicates the usual classification by solar-wind speed, especially at intermediate speeds.
D’Amicis R., Raines J. M., Benella S., Panasenco O., Velli M., Nicolaou G., Owen C. J., Dewey R. M., Louarn P., Fedorov A., Lepri S. T., Alterman B. L., Perrone D., De Marco R., Bruno R., Sorriso-Valvo L., Dhamane O. S., Rivera Y., Kieokaew O. R., Verscharen D., Consolini G., Yardley S., Réville V., Telloni D., Baker D., Lewis G., Watson G., Anekallu C., Darwish K., Prech L., Livi S., Horbury T., Mele G., Fortunato V., Monti F.   +34 more
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Cross Helicity and the Helium Abundance as an In Situ Metric of Solar Wind Acceleration

The Astrophysical Journal Letters
The two-state solar wind paradigm is based on observations showing that slow and fast solar wind have distinct properties like helium abundances, kinetic signatures, elemental composition, and charge-state ratios. Nominally, the fast wind originates from
B. L. Alterman, Raffaella D’Amicis
doaj   +1 more source