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Ulysses' return to the slow solar wind
Forsyth, R.; Balogh, A.; McComas, D. J. +9 more
After ten long years of wandering the uncharted seas, Ulysses returned to his home port of Ithaca. Similarly, after its unprecedented five year odyssey through the previously uncharted regions over the poles of the Sun, the Ulysses spacecraft has returned to the slow, variable solar wind which dominates observations near the ecliptic plane. Solar …
Differences in the O7+/O6+ ratio of magnetic cloud and non-cloud coronal mass ejections
Livi, S.; Woch, J.; Schwenn, R. +7 more
On its trajectory to Jupiter and over the poles of the Sun the Ulysses spacecraft has observed a considerable number of Coronal Mass Ejection (CME) transients in slow and in fast solar wind streams. The analysis of the magnetic field topology and the O7+/O6+ charge state ratio of 56 of these events has yielded strong evidence…
Radial heliospheric magnetic fields detected by Ulysses
Balogh, A.; Jones, G. H.; Forsyth, R. J.
The magnetometer aboard the Ulysses spacecraft has recorded numerous examples of heliospheric magnetic fields orientated in near-radial directions for periods of several hours or more. These fields are unusual, as their existence is contrary to the predictions of classical theories concerning solar wind production and propagation. The magnetic fie…
Do coronal mass ejections implode in the solar wind?
Riley, Pete; Gosling, J. T.
Ulysses observations show that many coronal mass ejections observed at high heliographic latitudes expand because they initially have higher internal pressures than that of the surrounding solar wind. This expansion commonly drives a shock wave into the ambient wind in all directions. In the analogous process of an explosion in the Earth's atmosph…
A pair of forward and reverse slow-mode shocks detected by Ulysses at ∼5 AU
Lakhina, G. S.; Tsurutani, B. T.; Smith, E. J. +6 more
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°S heliolatitude. The slow-mode shocks are found to occur in a compressed magnetic field (low plasma ) region within a co-rotating interaction region (CIR).…
Wind-Ulysses source location of radio emissions associated with the January 1997 coronal mass ejection
Maksimovic, M.; Kaiser, M. L.; Bougeret, J. -L. +2 more
We investigate the 3-D source location of interplanetary type Il-like radio bursts from observations involving two spacecraft. Uncommon type II radio emissions were observed simultaneously on 8 January 1997 by the Wind and Ulysses spacecraft and are believed to be associated with the Interplanetary Coronal Mass Ejection detected on 6-7 January by …
The symmetry of the heliospheric current sheet as observed by Ulysses during the Fast Latitude Scan
Balogh, André; Erdős, Géza
The position of the heliospheric current sheet is investigated, based on Ulysses observations during the fast latitude scan from the South pole (in September, 1994) to the North pole (in July, 1995). The location of the current sheet on the source surface was calculated by mapping back the magnetic field vectors measured by Ulysses along the solar…
Ulysses and WIND particle observations of the November 1997 solar events
Lario, D.; Balogh, A.; Maksimovic, M. +5 more
The episode of intense solar activity on 4 and 6 November 1997 resulted in large and extended particle events observed by the Ulysses and WIND spacecraft. Ulysses was at a heliocentric distance of 5.34 AU, very close to the solar equator and 100° west in heliolongitude from earth. WIND was near the earth at 0.99 AU from the Sun and in the ecliptic…
Quasi-periodic behavior of ion events and wave activity upstream from Jupiter's Bow Shock: Ulysses' observations
Balogh, A.; Sarris, E. T.; Anagnostopoulos, G. C. +3 more
A new insight into the ways that the Jovian magnetosphere influences the near Jupiter interplanetary space becomes possible thanks to Ulysses' collection of magnetic field, plasma and energetic ion (HI-SCALE) data during its inbound trajectory (d22-d34, 1992). The most striking new results from the analysis of those data are the following: a) pres…
Jovian radio “bullseyes” observed by Ulysses
MacDowall, R. J.; Kaiser, M. L.
We report the observation of extremely rare semi-bullseye or target-like features in the dynamic spectra of Jupiter obtained in 1991-1994 by the Ulysses Unified Radio and Plasma wave instrument. The emissions lie in the 20-50 kHz band and consist of narrow band (∼1-2 kHz) semi-concentric wisps on frequency-time dynamic spectra. The individual wisp…