Search Publications
FGS Observations of Two High-Velocity Stars
Osborn, Wayne; MacConnell, D. J.
The Hubble Space Telescope Fine Guidance System has been used to obtain precise astrometry in the fields of two stars of large space velocity: R 50 = G 166-37 and W 624 = G 16-25. The measures indicate a relative trigonometric parallax for R 50 of 4.0 mas, which implies a space velocity in the galactocentric rest frame of 467 km/sec. The derived p…
Results of a plasmoid model compared with data of coronal mass ejections
Bochsler, P.; Balsiger, H.; Wimmer-Schweingruber, R. F. +2 more
The motion of closed magnetic structures, plasmoids, in the solar atmosphere is examined in a simple model. A system of equations describing the dynamics, the internal energy balance, and the ionisation processes is solved numerically. While the plasmoids are accelerated and heated, ionisation and recombination processes of the ions take place. De…
Corotating Ion Enhancements observed by IMP 8 and Sampex at Earth and by ULYSSES at High Heliographic Latitudes
Mason, G. M.; Richardson, I. G.; Mazur, J. E.
Time and Energy Dependence of 26-Day Recurrent Decreases of >100 MeV Protons in the Inner Southern Heliosphere and its Correlation to Latitudinal Gradients: Ulysses COSPIN/KET Results
Kunow, H.; Bothmer, V.; Schmidt, J. +4 more
Observational signatures of nanoflare heated solar stellar coronae
Judge, P. G.; Hansteen, V. H.; Wikstøl, Ø.
Using time-dependent dynamical models of the radiating gas in coronal flux tubes, we identify features in UV spectral line profiles that can reveal the direction in which energy flows through the solar transition region, in observations without temporal or spatial resolution. The profile features survive spatial and temporal averaging through non-…
IACG Campaign III: solar events and their manifestation in interplanetary space and in geospace
Harrison, R. A.
In Spring 1994 the Inter Agency Consultative Group Campaign III was set up at a kick-off meeting in Sagamihara, Japan. The basic idea of Campaign III was to coordinate solar, interplanetary and near-Earth spacecraft in an effort to link solar and near-Earth observations relating to activity such as solar mass ejections, and features such as co-rot…
The Outer Atmospheres of Cool, Low Gravity Stars as Revealed by HST
Carpenter, Kenneth G.
We have used the Goddard High Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST) to measure the macroturbulent and flow velocities, the acceleration of winds, and the amount of hot (transition-region) plasma in the outer atmospheres of Carbon and K - M Giant/Supergiant stars. We see the acceleration of the stellar winds in the chro…
26Al in the Galactic Cosmic Radiation: Measurements with the Ulysses HET Instrument
Connell, J.
South-north and radial traverses through the zodiacal cloud.
Srama, R.; Grün, E.; Kissel, J. +17 more
The heliosphere at solar minimum and beyond. Proceedings. D0.2 Symposium of COSPAR Scientific Commission D which was held during the Thirty-first COSPAR Scientific Assembly, Birmingham (UK), 14 - 21 Jul 1996.
Marsden, R. G.; Page, D. E.
The following topics were dealt with: the main findings in Ulysses' exploration of high solar latitudes, modulation of the cosmic radiation, anomalous cosmic rays, the heliospheric boundary and direct detection of neutral helium from interstellar space.