Search Publications
Separation rate of the magnetic field lines observed by ULYSSES at high latitude
Balogh, A.; Erdös, G.; Kóta, J.
Ulysses has observed enhanced magnetic field fluctuations embedded in the fast solar wind originating from the high latitude coronal hole. These fluctuations proved to affect charged particle transport significantly. In this paper we apply a new method to determine the magnetic field line mixing from the actually measured magnetic field.
ERNE observations of energetic particle fluxes
Laitinen, T.; Vainio, R.; Valtonen, E. +7 more
The observations of the ERNE instrument on-board the SOHO spacecraft are analysed. The main period under study is from the beginning of May till mid-October 1996. Only very small energetic particle events were observed. A comparison of the ERNE measurements with energetic particle observations during the two previous solar minima indicates that th…
Recurrences of interplanetary interaction regions at southern solar latitudes and approximate harmonics
Lanzerotti, L. J.; Maclennan, C. G.; Thomson, D. J.
A series of low energy (~60 keV/nucl to several MeV/nucl) interplanetary particle enhancements was measured by the HI-SCALE instrument on the Ulysses spacecraft during the first approximately two-thirds of 1993. At this time Ulysses was located between ~4.3 - 5.0 AU and climbing from ~ 23 deg to ~40 deg south heliolatitude. Spectral analyses of th…
Low energy charged particles in the high latitude heliosphere
Lanzerotti, L. J.; Armstrong, T. P.; Gold, R. E. +3 more
Low energy ion and electron measurements made over the south and north polar regions of the sun by the HI-SCALE instrument on the Ulysses spacecraft during its solar minimum polar passages are summarized. The polar flux levels were considerably reduced in comparison to fluxes in the vicinity of the heliospheric current sheet. Flux variations with …
High resolution solar ultraviolet measurements
Vial, J. -C.; Wilhelm, K.; Curdt, W. +6 more
The increase of our understanding of the processes acting in the solar corona and maintaining it is strongly dependent on the quality of the data that are obtained to check theories. The fine structure of the solar atmosphere seen from the photosphere and extending to the hottest parts of the corona requires data with high resolution in all parame…
Plasma wave observations from the ULYSSES spacecraft's fast heliographic latitude scan
MacDowall, R. J.; Lin, N.; Hess, R. A. +1 more
Plasma wave observations obtained by the Ulysses spacecraft in 1994 and 1995 over a heliographic latitude range of -70 to +70 deg show significantly different wave characteristics inside and outside the streamer belt. Langmuir wave bursts are most commonly found in magnetic holes, especially in fast solar wind. The intensities of ion-acoustic-like…
Low frequency plasma waves in the solar wind: from ecliptic plane to the solar polar regions
Balogh, A.; Forsyth, R. J.; Lin, Naiguo +4 more
<B>Traveling from the ecliptic to the solar polar regions, Ulysses observed wave activity below the local electron cyclotron frequency, f_ce. In regions near the heliospheric current sheet (hereafter HCS regions), two wave modes are observed: (1) whistler mode electromagnetic waves near interplanetary shocks and during periods of rapidly inc…
Energetic particle anisotropies and remote magnetic connection at high solar latitudes
Fränz, M.; Keppler, E.; Burgess, D. +2 more
A very stable pattern of energetic particle events recurring with the solar rotation period dominates the Ulysses high latitude energetic particle observations during the current solar minimum. Most of these events can be associated with reverse shocks of corotating interaction regions (CIRs) but at latitudes above 50 deg there are either no shock…
Interplanetary variability in particle fluxes recorded by the low energy charged particle detector lion (40 KEV-6 MEV) on the soho spacecraft during its cruise phase to the L1 point
Kunow, H.; Muller-Mellin, R.; McKenna-Lawlor, Susan M. P. +6 more
Representative types of energetic particle phenomena recorded by the LION instrument on SOHO during its Transfer Phase to, and while in early Halo Orbit about, the L1 Lagrangian Point are presented. The data cover the period from 7 December 1995 (instrument switch on) until 9/10 July 1996 (when a particle event associated with the first Class X fl…
Diamagnetic effect of the ion pile-up region of comet halley
Neubauer, F. M.; Israelevich, P. L.; Ershkovich, A. I.
The ion pile-up region in the comet Halley ionosphere observed on the inbound leg of the Giotto trajectory is accompanied by a decrease of the magnetic field strength. This magnetic field dip is explained by means of a diamagnetic effect of the plasma density increase in the pile-up region. No similar magnetic effect of the enhanced plasma density…