Search Publications
Measurement of anomalous cosmic ray oxygen at heliolatitudes ∼25° to ∼64°
Simnett, G. M.; Pick, M.; Anderson, K. A. +8 more
We report measurements of the oxygen component (0.5 - 22 MeV/nucl) of the interplanetary cosmic ray flux as a function of heliolatitude. The measurements reported here were made with the Wart telescope of the HI-SCALE low energy particle instrument on the Ulysses spacecraft as the spacecraft climbed from ∼24° to ∼64° south solar heliolatitude duri…
Unusual wave phenomena near interplanetary shocks at high latitudes
MacDowall, R. J.; Stone, R. G.; Thejappa, G. +1 more
We report on several interplanetary shocks that are unusual because waves at about 10 Hz are highly electrostatic in the upstream region yet highly electromagnetic in the downstream region. These shocks, detected by the Unified Radio and Plasma Wave Experiment (URAP) on Ulysses are supercritical reverse shocks, which occurred predominantly at high…
The Ulysses Cosmic Ray Isotope Experiment: Isotopic Abundances of Fe and Ni from High Resolution Measurements
Simpson, J. A.; Connell, J. J.
Traversal of comet SL-9 through the Jovian magnetosphere and impact with Jupiter: radio upper limits
MacDowall, R. J.; Kaiser, M. L.; Desch, M. D. +2 more
Continuous radio observations below 1 MHz of Jupiter from the Ulysses spacecraft are used to establish an upper limit to the radiated power at low frequencies associated with the traversal through the magnetosphere and impact of Comet SL-9 with the planet. Although Jovian emissions were observed throughout the impact interval, no systematic intens…
Far-Ultraviolet Stellar Photometry: Fields in Sagittarius and Scorpius
Schmidt, Edward G.; Carruthers, George R.
Far-ultraviolet photometry for 741 objects in a field in Sagittarius centered near M8 and 541 objects in a field centered near sigma Scorpii is presented. These data were extracted from electographic images obtained with two cameras during a shuttle flight in 1991 April/May. The cameras provided band passes with lambdaeff = 1375 A and l…
Determination of Plasma Temperatures and Luminosities Using Multiple Extreme-Ultraviolet and X-Ray Filters
Brown, Alexander; Wood, Brian E.; Linsky, Jeffrey L.
We carefully examine the techniques used to infer temperatures of stellar coronal plasmas from the count rates of several broadband instruments in the X-ray and extreme-ultraviolet spectral ranges. In particular, we determine to what extent temperatures can be constrained and the corresponding uncertainties in the luminosities and emission measure…
Ulysses/Galileo Observations of Type III Radio Bursts and Associated In-situ Electrons and Langmuir Waves
Gurnett, D. A.; Roelof, E.; Anderson, K. A. +8 more
Both the Ulysses and Galileo spacecraft detected energetic electrons and Langmuir waves that were associated with a type III radio burst on 10 December 1990. At the time of these observations, these spacecraft were in the ecliptic plane and separated by 0.4 AU, with Galileo near the Earth at 1 AU and Ulysses at 1.36 AU. From the measured electron …
CCD astrometry and instrumental {DELTA}V photometry of wide visual double stars. IV. Differential measurements of northern pairs.
Sinachopoulos, D.; van Dessel, E.; Nakos, T.
We present relative positions and instrumental visual magnitude differences ({DELTA}V) of 101 northern wide double star components. The mean accuracy of the magnitude differences is 0.01 magnitudes, of the angular separation 0.04 arcseconds, and of position angle 0.13 degrees. Most of the programme pairs are targets of the HIPPARCOS mission and th…
Multi-Gaussian Deconvolution of Elliptical Sources: Reliability Tests Using Ground-Based and HST Images of m32
Parmeggiani, G.; Bendinelli, O.
Deconvolution of spherical sources from the Point Spread Functions based on multi-Gaussian expansions (RMG method) is here extended to elliptical objects by using bivariate Gaussians. To test accuracy and robustness of this approach, we have first derived the nuclear structure of M32 using observations obtained by the Palomar 60" under mediocre se…
Spatial Distribution and Orbital Properties of Interplanetary Dust at High Latitudes
Mann, I.
Although the interplanetary dust cloud is assumed to be mainly concentrated in the ecliptic plane, there is a component of dust particles on highly inclined orbits that forms the out-of-ecliptic distribution. The ULYSSES mission for the first time makes this component accessible to in-situ, detection. Evidence for this dust component is also provi…