Alfven Waves in the Polar Heliosphere: Ulysses Observations
One of the characteristic features of the polar heliosphere discovered by Ulysses is the continuous.
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One of the characteristic features of the polar heliosphere discovered by Ulysses is the continuous.
During its south polar passage in 1994, the Ulysses spacecraft continuously sampled the properties.
The overall multi-layer structure of the magnetic field observed by Ulysses across a broad solar wind tangential discontinuity can be reproduced fairly well by means of a kinetic model. Such a simulation provides complementary information about the velocity distribution functions, which are not always known due to the low time resolution inherent in plasma measurements. The success of such a simulation proves that our kinetic model can be used as a realistic basis for further studies of the structure and stability of tangential discontinuities.
We report the first finding of a pair of forward and reverse slow-mode shocks in the distant heliosphere using plasma and magnetic field data from the Ulysses spacecraft located at 5.3 AU and 9 degrees South heliolatitude.
Radio metric data from the Pioneer 10/11, Galileo, and Ulysses Spacecraft indicate an apparent anomalous, constant, acceleration acting on the spacecraft with a magnitude ~8.5 x 10(sup -8) cm/s(sup 2), directed towards the Sun.
Measurements of the specific entropy argument of solar wind protons, T/n superscript y-1, reveal that nearly every occurrence of a high-speed stream seen at Ulysses in 1992-3 is characterized by an abrupt interface at its trailing edge.
The Ulysses mission explored for the first time our heliosphere at all latitudes up to +/-80 and therefore has been an ideal mission to study potential gradients in heliolatitude of discontinuity occurrence rates and types.
The Ulysses mission explored for the first time our heliosphere at all latitudes up to +/-80 and therefore has been an ideal mission to study potential gradients in heliolatitude(and radial distance) of discontinuity occurrence rates and types.
During its travel to Jupiter (1 to 5.4 AU) Ulysses detected 25 ejecta signatures attributed to interplanetary counterparts of coronal mass ejections and 32 transient forward shocks.
All heliospheric current sheet (HCS) crossings and corotating solar wind streams detectedby both WIND and ULYSSES have been identified.
The predicted return of the solar-induced nutation of the spin-stabilized Ulysses.
This paper presents results from the first statistical study of interplanetary directional discontinuities at high heliographic latitudes. Ulysses data showed that the rate of occurrence of interplanetary discontinuities (ROIDs) increased dramatically from the ecliptic plane to high (-80 degrees) heliographic latitudes. The high speed streams included Alfven waves.
A study is presented of 153 fast shock waves and their relation to other large-scale features in the solar wind: corotating interaction regions (CIRs), interplanetary counterparts of coronal mass ejections (ICMEs) and the magnetic sector structure, observed by Ulysses from October 1990 to the south solar pass in the summer of 1994.
We report observations of radial and latitudinal gradients of Ulysses plasma parameters.
In early 1992, at 13 degrees south latitude, in transit to the southern solar pole, Ulysses began to sample a recurrent high-speed solar wind stream which emanated from a coronal hole at the south pole of the Sun.
Ulysses recently completed a second slow latitude scan of the northern heliosphere, a descent from 80.2 degrees North in July 1995 to the solar equator in December 1997.
Properties of the large amplitude Alfven waves which are a dominant feature of the high latitude solar wind have been studied during the pole-to-pole passage of Ulysses.
The solar wind is an ionized gas flowing from the solar corona and consisting primarily of free electrons, protons, and doubly-ionized helium. Ulysses solar wind plasma observations through -80.2 degrees solar latitude and continuing equatorward to -40.1 degrees are summarized. Recurrent high-speed streams and corotating interaction regions dominate at mid latitudes. Observation and analysis is given.