NDLI: O$^{5+}$ in High Speed Solar Wind Streams: SWICS/Ulysses Results

Content Provider	Springer Nature Link
Author	Wimmer Schweingruber, Robert F. Von Steiger, Rudolf Geiss, Johannes Gloeckler, George Ipavich, Fred M. Wilken, Berend
Copyright Year	1998
Abstract	Recent observations with UVCS on SOHO of high outflow velocities of O$^{5+}$ at low coronal heights have spurred much discussion about the dynamics of solar wind acceleration. On the other hand, O$^{6+}$ is the most abundant oxygen charge state in the solar wind, but is not observed by UVCS or by SUMER because this helium-like ion has no emission lines falling in the wave lengths observable by these instruments. Therefore, there is considerable interest in observing O$^{5+}$ in situ in order to understand the relative importance of O$^{5+}$ with respect to the much more abundant O$^{6+}$. High speed streams are the prime candidates for the search for O$^{5+}$ because all elements exhibit lower freezing-in temperatures in high speed streams than in the slow solar wind. The Ulysses spacecraft was exposed to long time periods of high speed streams during its passage over the polar regions of the Sun. The Solar Wind Ion Composition Spectrometer (SWICS) on Ulysses is capable of resolving this rare oxygen charge state. We present the first measurement of O$^{5+}$ in the solar wind and compare these data with those of the more abundant oxygen species O$^{6+}$ and O$^{7+}$. We find that our observations of the oxygen charge states can be fitted with a single coronal electron temperature in the range of 1.0 to 1.2 MK assuming collisional ionization/recombination equilibrium with an ambient Maxwellian electron gas.
Starting Page	387
Ending Page	396
Page Count	10
File Format	PDF
ISSN	00386308
Journal	Space Science Reviews
Volume Number	85
Issue Number	1-2
e-ISSN	15729672
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy, Astrophysics and Cosmology Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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