Search Publications
Propagation and evolution of a magnetic cloud from ACE to Ulysses
Wang, C.; Du, D.; Hu, Q.
The chance of a magnetic cloud (MC) being observed by widely separated spacecraft is rare. However, such an event provides us a good opportunity to study the propagation and evolution of magnetic cloud in the interplanetary space. A magnetic cloud event observed by ACE at Earth on 4-6 March 1998 is tracked from the location of ACE to Ulysses. Usin…
On the origin of near-radial magnetic fields in the heliosphere: Numerical simulations
Riley, Pete; Gosling, J. T.
Deviations from the direction of the "Parker spiral" can be found in in situ measurements of the interplanetary magnetic field on essentially all scales. One intriguing subset is the intervals of near-radial magnetic field, lasting for many hours. Some such intervals are obviously associated with coronal mass ejections, while others appear to be e…
Cassini/Cosmic Dust Analyzer in situ dust measurements between Jupiter and Saturn
Dikarev, V.; Kempf, S.; Srama, R. +5 more
We report an analysis of the Cosmic Dust Analyzer data obtained during the interplanetary cruise of the Cassini spacecraft between Jupiter and Saturn. The data cover the time period between the Jupiter flyby and the Saturn orbit insertion. Seventeen dust particles on bound and unbound (hyperbolic) orbits were also detected, with sizes in the submi…
Field distributions and shapes of Langmuir wave packets observed by Ulysses in an interplanetary type III burst source region
Nulsen, A. L.; Cairns, Iver H.; Robinson, P. A.
There is no consensus on the mechanisms producing the intense bursty Langmuir wave packets routinely observed in source regions of interplanetary type III radio bursts. Using data from the Ulysses Fast Envelope Sampler (FES) near 4 AU, new analyses of the distributions of wavefields clearly separate the Langmuir waves into "intense localized struc…
Large-scale structure of the fast solar wind
Breen, A. R.; Bisi, M. M.; Fallows, R. A. +2 more
We present the results of a comprehensive study of the fast solar wind near solar minimum conditions using interplanetary scintillation (IPS) data taken with the EISCAT system in northern Scandinavia, and a recent extremely long baseline observation using both EISCAT and MERLIN systems. The results from IPS observations suggest that the fast wind …
Energetic particle observations by Ulysses during the declining phase of solar cycle 23
Forsyth, R. J.; Lanzerotti, L. J.; Marsden, R. G. +4 more
We present recent energetic particle measurements from 1-20 MeV/n recorded by the Ulysses/COSPIN/LET instrument from mid-October to the end of November 2003 and from May 2004 to the end of February 2005. Long-lasting periods with enhanced solar activity occurred during the declining phase of the current solar cycle contributing to the high-intensi…
Spectra of polar heliospheric fields and implications for field structure
Giacalone, Joe; Jokipii, J. R.; Goldstein, Melvyn L. +2 more
The predictions of the ``Fisk'' model for a peak at the equatorial solar rotation frequency in the spectrum of the latitudinal component of the heliospheric magnetic field were found to give values significantly larger than those observed. The observed values were statistically the same as observed in the ecliptic and were consistent with random f…
Radio tracking of the interplanetary coronal mass ejection driven shock crossed by Ulysses on 10 May 2001
MacDowall, R. J.; Hoang, S.; Lacombe, C. +1 more
We report on the detection of type II radio emission which was observed for more than a day prior to the arrival of an interplanetary shock at Ulysses. We use local spectral emission peaks, computerized from time-averaged intensity spectra of the type II burst, to track the associated emitting shock. In the spectrogram plotted as a function of tim…
Energetic particles during the first and third Ulysses southern high-latitude excursions: Probing global corotating interaction region structure beyond 5 AU
Lario, D.; Roelof, E. C.
We analyze energetic particle observations during the first and third ascents of Ulysses to the southern regions of the heliosphere. The first high-latitude excursion occurred in the declining phase of solar cycle 22, while the third occurred in a later phase of solar cycle 23. In contrast to the long-lived and well-defined ~26-day recurrent inten…
Fluid versus simulation model of solitons in solar wind: Application to Ulysses observations
Dubinin, E.; Sauer, K.; Baumgärtel, K. +1 more
This paper continues recent efforts based on Hall-MHD theory (Sauer et al., 2007) to explain a new class of magnetically compressive solitary structures in the interplanetary space, observed by the Ulysses magnetometer (Rees et al., 2006). The theoretical basis is extended by a kinetic approach via one-dimensional hybrid code simulations which rev…