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3-D Distribution of Cosmic Rays in the Outer Heliosphere
Jokipii, J. R.; Kóta, J.
Radial gradients of ion densities and temperatures derived from SWICS/Ulysses observations
Livi, S.; Woch, J.; Marsch, E. +4 more
Mean density and temperature gradients of solar wind protons and α particles are derived from SWICS/Ulysses observations between 1.2 and 5.4 AU in the ecliptic plane during declining solar activity. All parameters are sorted in solar wind speed classes. The radial gradients show a similar behavior for both ion species. In the slow solar wind proto…
Cosmic ray modulation by expanding, high-latitude streams
Keppler, E.; Quenby, J. J.; Drolias, B. +2 more
As ‘Ulysses’ moved to latitudes above 45°, the regular, recurring series of mid-latitude high-speed streams is no longer observed out to 4 AU. However, the associated, near-relativistic particle modulation persists to at least 70°. We explain this remote shadowing as due to the spread in latitude of the fast streams beyond the ‘Ulysses’ trajectory…
Comparison of the main magnetic and plasma features in the environments of comets Grigg-Skjellerup and Halley
Glassmeier, K. -H.; Neubauer, F. M.; Reme, H. +1 more
The successful flyby of Giotto at the weakly active comet P/Grigg-Skjellerup on July 10, 1992 has added a new set of observations to those obtained at the active comet P/Halley in March 1986 for the study of the solar wind - comet interaction. Despite the very different scales of the interaction regions for the two comets (10^6 km for Halley and 1…
IUE observations of blue horizontal branch stars in the globular clusters M 3 and NGC 6752.
Cacciari, C.; Bragaglia, A.; Fusi Pecci, F. +1 more
IUE observations of 3 blue horizontal branch (BHB) stars in M 3 and 4 stars in NGC 6752 are presented. In addition, unpublished IUE archive data have been used for 5 more BHB stars in NGC 6752. Using the most recent model atmospheres (Kurucz 1992) the physical parameters of these stars have been derived, and compared with the ZAHB evolutionary tra…
Rotationally Resolved Studies of the Mid-Ultraviolet Spectrum of Triton. II. HST Surface and Atmospheric Results
Stern, S. Alan; Trafton, Laurence M.; Flynn, Brian
Using the Hubble Space Telescope (HST) we have obtained useful spectra of Triton at a resolution of 2 Å from 1900-3278 Å, at five rotational phases in 1992 and 1993. We present these data and analyze them to evaluate the rotational variability of Triton's mid-ultraviolet reflectance spectrum, albedo, and color slope. The main characteristics of Tr…
HST Images of the Eclipsing Pulsar B1957+20
Fruchter, Andrew S.; Bailyn, Charles D.; Bookbinder, Jay
We have obtained images of the eclipsing pulsar binary PSR~B1957+20 using the Planetary Camera of the Hubble Space Telescope. The high spatial resolution of this instrument has allowed us to separate the pulsar system from a nearby background star which has confounded ground-based observations of this system near optical minimum. Our images limit …
Multifrequency Observations of KAZ 102 during the ROSAT All-Sky Survey
Maraschi, L.; Tanzi, E. G.; Pian, E. +14 more
The bright quasar Kaz 102, which lies in the vicinity of the North Ecliptic Pole, was monitored during the ROSAT All Sky Survey for 121.5 days from 1990 July 30 to 1991 January 25. In the course of the survey, optical photometry with various filters was performed at several epochs, together with UV (IUE) and optical spectrophotometry. The spectral…
Motion of the Heliospheric Termination Shock at High Heliographic Latitude
Barnes, Aaron
We expect the mean distance of the heliospheric termination shock to be greater (smaller) at polar latitudes than at equatorial latitudes, depending on whether the mean dynamic pressure of the solar wind is greater or smaller at high latitudes. The heliospheric termination shock is expected to move in response to variation in upstream solar wind c…
Discovery of Extreme-Ultraviolet Radiation from the Seyfert Galaxy Ton S180 (= EUVE J0057-223)
Thorstensen, John R.; Bowyer, Stuart; Vennes, Stephane +1 more
We report the detection of intense EUV radiation from the Seyfert 1 galaxy Ton S180. The source EUVE J0057-223, discovered in the Extreme-Ultraviolet Explorer all-sky survey, is only 25" away from its optical counterpart, well within the position error circle. We present a complete broadband energy distribution of Ton S180 using infrared (IRAS), o…