Search Publications

Identification of beta -meteoroids from measurements of the dust detector onboard the ULYSSES spacecraft

Mann, I.; Wehry, A.

We investigate the detection of beta -meteoroids (i.e. dust particles that leave the Solar system in unbound orbits from the direction of the Sun) in the data set of the Ulysses dust experiment. Analysis of the detection geometry of the experiment for the time span from launch until the end of 1995 shows that the detection of beta -meteoroids is p…

Interstellar oxygen in the heliospheric interface: influence of electron impact ionization

Geiss, J.; Lallement, R.; Izmodenov, V. V.

A fraction of the interstellar atoms crosses the interface between the solar wind and the ionized component of the local interstellar medium (the heliospheric interface), and enters the heliosphere. The number of penetrating atoms depends on the strength of the atom-plasma interaction, i.e. on the atom type. In this paper we consider the penetrati…

Spectral analysis of the magnetic field inside particle propagation channels detected by ULYSSES

Forsyth, R. J.; Lanzerotti, L. J.; Maclennan, C. G. +2 more

Prior studies have identified particle propagation channels in the interplanetary medium where nearly scatter-free propagation occurs. These channels have been identified to exist as far away from the Sun as ~ 4 AU. We report here a study that has examined, using spacecraft-based instrumentation, the nature of the fluctuations of the interplanetar…

Interplanetary scattering effects in the jovian bKOM radio emission observed by ULYSSES

MacDowall, R. J.; Woan, G.; Barrow, C. H.

The scattering of radio waves by the interplanetary medium (subsequently referred to simply as `scattering') imposes limitations on measurements of fine temporal and angular structure at low radio frequencies. The jovian broad-band kilometric radiation (bKOM) is highly structured and observations of this emission, by the Unified Radio and Plasma E…

Low frequency plasma turbulence and high energy particles at CIR-related shock waves

Claßen, H. -T.; Mann, G.; Forsyth, R. J. +1 more

We present initial results from a survey of the low frequency magnetic field turbulence measured at the forward/reverse shock pairs associated with the interaction regions of high and low speed solar wind streams (CIRs). The magnetic field data are taken from vector helium and fluxgate magnetometer observations (VHM/FGM) aboard the Ulysses spacecr…

A serendipitous observation of the gamma-ray burst GRB 921013b field with EUVE

Hurley, K.; Bowyer, S.; Lund, N. +3 more

We report a serendipitous extreme ultraviolet observation by EUVE of the field containing GRB 921013b, ~ 11 hours after its occurrence. This burst was detected on 1992 October 13 by the WATCH and PHEBUS on Granat, and by the GRB experiment on Ulysses. The lack of any transient (or quiescent) EUV source imposes a 2sigma upper limit of 1.3 x 10(-12)…