Search Publications
The speeds of coronal mass ejections in the solar wind at mid heliographic latitudes: Ulysses
McComas, D. J.; Goldstein, B. E.; Bame, S. J. +3 more
Six CMEs have been detected in the Ulysses plasma observations poleward of S31°. The most striking aspect of these mid-latitude CMEs was their high speeds; the overall average speed of these CMEs was ∼ 740 km s-1, which was comparable to that of the rest of the solar wind at these latitudes. This average CME speed is much higher than av…
Concentration of interstellar pickup H+ and He+ in the solar wind
Geiss, J.; Giacalone, J.; Gloeckler, G. +1 more
We present observations of interstellar pickup hydrogen and helium in the solar wind which show large, highly-correlated fluctuations in flux which are not correlated significantly with the solar-wind hydrogen flux. The correlation of the fluctuations in the two species implies that the fluctuations are caused by transport after ionization. The la…
Observation by Ulysses of hot (∼270 keV) coronal particles at 32° south heliolatitude and 4.6 AU
Simnett, G. M.; Pick, M.; Anderson, K. A. +11 more
An unusual event of streaming 60 keV-2 MeV ions (with energy spectrum peaked ∼270 keV) and of 42-315 keV electrons occurred during the passage of a coronal mass ejection (CME) over the Ulysses spacecraft June 9-13, 1993, located at helioradius 4.6 AU and heliolatitude 32° south. The topology of the interplanetary magnetic field (IMF) within the CM…
On the cross-field diffusion of ions in one- and two-dimensional hybrid simulations of collisionless shocks
Giacalone, Joe
It can be demonstrated analytically that under certain geometries used in numerical simulations of collisionless shocks in which there is at least one ignorable spatial coordinate, the transport of particles across the magnetic field is essentially zero. This notion is tested using one- and two-dimensional hybrid simulations (kinetic ions/ fluid e…
Null fields in the outer Jovian magnetosphere: Ulysses observations
Dougherty, M. K.; Balogh, A.; Smith, E. J. +3 more
This paper reports on a magnetic field phenomenon, hereafter referred to as null fields, which were discovered during the inbound pass of the recent flyby of Jupiter by the Ulysses spacecraft. These null fields which were observed in the outer dayside magnetosphere are characterised by brief but sharp decreases of the field magnitude to values les…
Dust streams from comet Shoemaker-Levy 9?
Hamilton, D. P.; Horanyi, M.; Polanskey, C. +3 more
In 1991 and 1992, the dust detector onboard the Ulysses spacecraft detected several dust streams apparently originating from the jovian system. The timing and measured speeds of the final two dust streams are compatible with dust from comet Shoemaker-Levy 9's (SL9) disruption in 1992. Our further investigations of stream characteristics and dust a…
Evidence that Jupiter is not the source of the 2-3 kHz heliospheric radiation
Gurnett, D. A.; Kurth, W. S.
It has been suggested that continuum radiation from Jupiter could provide the source for the 2- to 3-kHz radio emissions detected by Voyagers 1 and 2 in the outer heliosphere. By a fortuitous set of circumstances the Ulysses flyby of Jupiter in early 1992 provided an opportunity to compare the intensity of a strong, new heliospheric radio emission…
Ulysses observations of a recurrent high speed solar wind stream and the heliomagnetic streamer belt
McComas, D. J.; Goldstein, B. E.; Bame, S. J. +4 more
Near-ecliptic solar wind observations by Ulysses on its way to the polar regions of the Sun, compared with those from IMP 8 at 1 AU, showed that high-speed streams decay and broaden with heliocentric distance from IMP 8 to Ulysses, as expected. In July 1992 while travelling south at ∼13°S and 5.3 AU, Ulysses encountered a recurrent high-speed stre…
Perpendicular transport in 1- and 2-dimensional shock simulations
Giacalone, J.; Jokipii, J. R.; Kota, J.
We consider the foundations of 1- and 2-dimensional shock simulations in which the physical quantities are independent of a coordinate which is not parallel to the magnetic field. We show analytically that in such simulations the ions are effectively tied to the convected magnetic lines of force because of the presence of an ignorable spatial coor…
Latitudinal variation of solar wind corotating stream interaction regions: Ulysses
McComas, D. J.; Goldstein, B. E.; Bame, S. J. +4 more
Ulysses’ initial transit to high heliographic latitudes at a heliocentric distance of ∼5 AU has revealed systematic effects in the latitudinal evolution of corotating interaction regions (CIRs). At a latitude corresponding roughly to, but slightly less than, the inferred tilt of the coronal streamer belt and embedded heliospheric current sheet, th…