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- W1966141701 abstract "High-speed solar wind is known to originate in polar coronal holes, which, however, are made up of two components: bright, high-density regions known as and dark, weakly emitting low-density regions known as interplumes. Recent space observations have shown that the width of UV lines is larger in interplume regions, while observations of the ratio of the O VI doublet lines at 1032 and 1037 A, at 1.7 solar radii, suggest higher outflows in interplume regions than in plumes at that altitude. These results favor interplume regions as sources of the fast solar wind. The present work aims at investigating the outflow speed versus altitude properties of the O VI and H I ions, at heights below 2 solar radii, in both plumes and interplume regions. To this end, we examined Solar Ultraviolet Measurement of Emitted Radiation (SUMER) and Ultraviolet Coronagraph Spectrometer (UVCS) observations of a north polar coronal hole taken on 1996 June 3, over the altitude range between 1 and 2 solar radii, and through a Doppler dimming analysis of our data, we show that interplume areas may be really identified as sources of fast wind streams. The behavior of plumes, on the contrary, can be interpreted in terms of static structures embedded in the interplume ambient. We conclude by comparing our results with the predictions of theoretical models of the solar wind and giving an empirical estimate of the heating rate, per particle, for H I and O VI ions in interplume regions at 1.75 and 2.0 solar radii." @default.
- W1966141701 created "2016-06-24" @default.
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- W1966141701 date "2003-05-01" @default.
- W1966141701 modified "2023-09-26" @default.
- W1966141701 title "The Nascent Solar Wind: Origin and Acceleration" @default.
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- W1966141701 doi "https://doi.org/10.1086/368409" @default.
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