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Solar and Heliospheric Processes from Solar Wind Composition Measurements
Geiss, J.; Gloeckler, G.; von Steiger, R.
Composition measurements in the solar wind provide important information for solar system science and astrophysics. We show in this report how ion composition data are used to investigate chromospheric and coronal processes. Isotopic abundances in the Sun can best be derived from solar wind measurements. 3He/4He is an isotopi…
The Heliosphere and the Ulysses Mission
Balogh, A.
The interplanetary medium consists primarily of the supersonic solar wind, carrying the frozen-in magnetic field extending from the solar corona. The properties of this medium are controlled by the state of the corona and by dynamic processes occurring in the medium itself. As a result, there are significant variations in those properties as a fun…
Recent Magnetic Field Results from the Galileo and Ulysses Spacecraft: Discussion
Wallis, M. K.; Southwood, D. J.; Miller, S.
Recent Magnetic Field Results from the Galileo and Ulysses Spacecraft
Southwood, D. J.
Both Galileo and Ulysses spacecraft have made important exploratory measurements before either start the main phase of their missions. Galileo has flown by several objects in the inner Solar System before its reaching Jupiter. The most notable results from the spacecraft magnetometer are the detection of magnetic field deflections in the vicinity …
Giotto Observations of Comet Halley Dust
Zarnecki, J. C.; McDonnell, J. A. M.; Chakaveh, S. C. +3 more
Measurements of the dust environment of Comet P/Halley by the dust experiments on the Giotto and Vega spacecraft are discussed, as well as some aspects of the dust modelling that was carried out before the spacecraft encounters with the comet. These data have highlighted certain shortcomings in the models. For example, significant fluxes of grains…
Giotto Observations of Comet Halley Dust: Discussion
McDonnell, J. A. M.; Lovell, Bernard; Hoyle, Fred +1 more
The γ -ray Emissivity of the Local Interstellar Medium from Correlations with Gas at Intermediate Latitudes
Strong, A. W.; Wolfendale, A. W.
A survey of recent studies of the correlation between γ -rays from latitudes |b| > 10 degrees and gas tracers is presented. Results for the ranges 35-100 MeV and above 100 MeV from the SAS-2 satellite, and for energies between 70 and 5000 MeV from the COS-B satellite, are used to obtain an estimate of the γ -ray emissivity spectrum for all form…
Low-Latitude Galactic γ -ray Emission: A Probe, not a Proof
Bignami, G. F.
The emission of high energy (above 70 MeV) γ -rays from the galactic disc has been mapped by the COS-B mission with unprecedented detail. The results for |b| < 15 degrees are seen to contain evidence of structures correlated with the Galaxy on various scales, from the `grand design' down to granularities, showing that the diffuse interstellar m…
On the Evidence for High Energy γ -ray Emission from the Orion Nebula Stemming from COS-B Observations
Caraveo, P. A.
The E.S.A. COS-B satellite performed a one-month observation pointing in the direction of M42 in Orion, during July-August 1978. An excess of high energy (above 100 MeV) photons is seen in the data, well coinciding with the Orion cloud complex. Features of such an excess are discussed, such as flux value, spectral shape and possible spatial extens…