Search Publications
The Three-Dimensional Extent of a High-Speed Solar Wind Stream
Balogh, A.; Goldstein, B. E.; Bame, S. J. +5 more
A primary goal of the Ulysses mission is to study the 3-dimensional structures making up the interplanetary medium, and example of which is the high speed solar wind stream observedin situ by Ulysses beginning in July 1992. In order to study the longitudinal extent of this stream as a function of Ulysses' increasing heliographic latitude, a second…
Simulations of Pickup-Ion Acceleration at Quasi-Perpendicular Shocks
Giacalone, J.; Jokipii, J. R.
We present results from hybrid simulations (kinetic ion/fluid electron) of the interaction of interstellar pickup ions with collisionless shocks. Since cross-field transport is unphysically suppressed in the one-dimensional geometry used here, an ad hoc scattering algorithm is used to model this effect. This is a necessary step to accelerate the p…
Ulysses-Voyager Study of Energetic Particles Associated With the Intense Solar Activity of March/June 1991
Keppler, E.; Reuss, M. K.; McDonald, F. B.
The intense solar activity centered in March and June 1991 produced some of the largest interplanetary disturbances over the past several solar cycles. For these events the Ulysses EPAC energetic particle observations near 3 AU are compared with those of the Voyager 2 CRS experiment near 35 AU. At Voyager 2 there is a single long-lived event exten…
Variations of the High Energy Electron Flux Along the ULYSSES Trajectory
Sierks, H.; Kunow, H.; Wibberenz, G. +7 more
We describe for the first time the analysis of high energy electrons (above 240 MeV) from the COSPIN/KET experiment onboard Ulysses. The electron time profiles in four energy windows are presented from Oct. 90 to the end of March 94, up to a maximum heliographic latitude of 57 °S. The recovery rates we derived for the electrons are compared to the…
Radio Occultation Studies with Solar Corona Sounders
Pätzold, M.; Neubauer, F. M.; Bird, M. K.
Solar Corona Sounders (SCS), a mission designed to utilize the radio occultation technique for investigations of the inner heliosphere, was submitted to ESA in response to a call for new mission concepts. The SCS platforms are two small multifrequency transmitters placed at the “anti-Earth” position (superior solar conjunction) for continuous radi…
A particle event at 5 AU and 20° southern latitude from measurements with the EPAC instrument on Ulysses
Krupp, N.; Fränz, M.; Balogh, A. +9 more
In November 1992, the Ulysses spacecraft observed a multiple solar particle event and a CME event at 5.2 AU and a heliographic latitude of 20° S which were superimposed to the recurrent corotating interacting region. Distinct particle flux increases caused by these events were observed in all energy channels of the EPAC experiment. The experimenta…
Interaction Between Whistler-Mode Waves and Electrons in the Vicinity of Interplanetary Shocks as Seen by Ulysses: A Preliminary Study
Balogh, A.; Forsyth, R. J.; Bame, S. J. +5 more
We present a study of wave particle interaction in the vicinity of interplanetary shocks in the ecliptic plane, as observed by the Ulysses spacecraft. We focus here on some events, for which electromagnetic waves are observed, mainly down-stream of the shock. The whistler mode waves are studied by means of the Unified RAdio and Plasma wave experim…
Interplanetary Type III Radio Bursts Observed Simultaneously by ULYSSES and ICE
Stone, R. G.; Reiner, M. J.; Hoang, S. +1 more
We analyze two solar type III radio bursts that were observed simultaneously by the ICE and Ulysses spacecraft. Both bursts originated behind the solar limb as viewed from either spacecraft. At the time of these events, ICE was in the ecliptic plane at ∼1 AU and Ulysses was ∼ 35° south of the ecliptic plane at ∼4 AU. For one event on 931117, the r…
Interplanetary Type III Radio Bursts Observed from High Southern Heliographic Latitudes
Stone, R. G.; Fainberg, J.; Reiner, M. J.
Type III radio bursts observed from high southern latitudes are analyzed for the first time. The continual observation of these radio bursts by Ulysses from after the Jupiter swing-by to 50°S latitude argues for a wide latitudinal directivity of type III radiation. From this high latitude perspective, type III radio sources that lie in the far hem…
Solar Particles Seen by ULYSSES Near 33 deg S Latitude
Simnett, G. M.; Tappin, S. J.
We have analysed the ions and electrons seen by the HI-SCALE instrument on the Ulysses spacecraft in the interval from 21 30 June 1993, ahead of an arrival of the CIR which has dominated the particle environment of Ulysses since July 1992. These particles show velocity dispersion effects usually associated with solar-flare particles. There was no …