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Pronounced enhancements of pickup hydrogen and helium in high-latitude compressional regions
Schwadron, N. A.; Zurbuchen, T. H.; Gloeckler, G. +1 more
Pickup hydrogen and helium distributions are measured in compressive corotating regions at high heliographic latitudes. The enhancements can be explained using a pickup ion transport model which includes compression but requires a long scattering mean free path. The long mean free path is generally observed for pickup ions at high latitudes, but i…
The density structure of a solar polar coronal hole
Warren, H. P.; Hassler, D. M.
Electron densities derived from Si III, Ne VII, Mg VIII, Si VIII, and Mg IX line ratios observed above the limb of a polar coronal hole with the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer on the Solar and Heliospheric Observatory (SoHO) are presented. The electron densities are consistent with a constant pressure of 1…
Synoptic Sun during the first Whole Sun Month Campaign: August 10 to September 8, 1996
Thompson, B. J.; Hoeksema, J. T.; Biesecker, D. A. +6 more
A large number of synoptic maps from a variety of instruments are used to show the general morphology of the Sun at the time of the First Whole Sun Month Campaign. The campaign was conducted from August 10 to September 8, 1996. The synoptic maps cover the period from Carrington rotation 1912/253° to Carrington rotation 1913/45°. The synoptic maps …
In-ecliptic CIR-associated energetic particle events and polar coronal hole structures: SOHO/COSTEP observations for the Whole Sun Month Campaign
Heber, Bernd; Szabo, Adam; Bothmer, Volker +7 more
The Solar and Heliospheric Observatory (SOHO), in halo orbit around the L1 Lagrangian point of the Sun-Earth system, combines a unique set of instruments for studies of the Sun and the heliosphere. SOHO's Comprehensive Suprathermal and Energetic Particle Analyser measures in situ particles in the energy range 44 keV/particle to above 53 MeV/nucleo…
Energetic particles in the duskside Jovian magnetosphere
Woch, J.; Dougherty, M. K.; Keppler, E. +2 more
The paper provides a detailed description of energetic ion measurements from the Energetic PArticle Composition instrument (EPAC) and magnetic field measurements from the dual-technique magnetometer on board Ulysses made in the duskside Jovian magnetosphere after its Jupiter flyby on February 8, 1992. The Ulysses spacecraft performed these in situ…
The induced magnetosphere of comet Halley 4. Comparison of in situ observations and numerical simulations
Neubauer, F. M.; Gombosi, T. I.; Israelevich, P. L. +3 more
A comprehensive comparison between the results of a multiscale three-dimensional adaptive MHD model of the comet Halley magnetosphere and in situ observations by the Giotto mission is presented. It is shown how a steady state model can describe the effects of the varying IMF direction on the cometary magnetosphere. The simulation results reproduce…
Concurrent solar and corotating interaction region particle events in August 1996
Torsti, J.; Anttila, A.; Sahla, T.
The energetic particle telescope ERNE onboard SOHO registered a continuous particle flux enhancement during August 7-18, 1996. The particle event was limited in the low energy range from 1.6 to 8 MeV during the first week of the event. It originated from a corotating interaction region (CIR). At 1630 UT on August 13, an additional new flux of ener…
Spectrophotometry of Saturn's small satellites and rings from Hubble Space Telescope images
Sicardy, Bruno; Poulet, François; Karoschka, Erich
We investigate the photometric properties of four of Saturn's inner satellites (Prometheus, Pandora, Janus, and Epimetheus) and five ring regions (the A, B, and C rings; the Cassini division; and the F ring). We have used Hubble Space Telescope images taken in July 1991 and during the Saturn's ring plane crossings by the Earth (August 1995) and th…