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An Empirical Study of the Electron Temperature and Heavy Ion Velocities in the South Polar Coronal Hole

Gloeckler, George; Geiss, Johannes; Fisk, Lennard A. +2 more

The solar wind ions flowing outward through the solar corona generally have their ionic fractions `freeze-in' within 5 solar radii. The altitude where the freeze-in occurs depends on the competition between two time scales: the time over which the wind flows through a density scale height, and the time over which the ions achieve ionization equili…

The Directivity of Solar Kilometric Type III Bursts: Ulysses-Artemis Observations in and Out of the Ecliptic Plane

Bougeret, J. -L.; Hoang, S.; Poquérusse, M.

Comparing the records of the radio spectrographs ARTEMIS (100-500 MHz) on the ground and URAP (1-1000 kHz) on the Ulysses spacecraft, we find that most type III bursts extend from the corona to the solar wind. Using the positions of the associated flares, and assuming an average intensity ratio between these two frequency ranges, we derive for the…

Pole-To Solar Wind Density from ULYSSES Radio Measurements

Issautier, K.; Moncuquet, M.; Meyer-Vernet, N. +1 more

We present new in situ measurements of solar wind electron density as a function of heliolatitude. The data were obtained on Ulysses during its fast transit from south solar pole to north solar pole, at heliocentric distance about 1.5 AU, near the 1996 solar activity minimum. The density is measured accurately using the method of quasi-thermal noi…

Solar and heliospheric plasma physics. Proceedings. 8th European Solar Physics Meeting, Halkidiki (Greece), 13 - 18 May 1996.

Heinzel, P.; Simnett, G.

The main topic was the interaction of the Sun with the heliosphere, focused on first results from SOHO and new results from Ulysses. The following topics were dealt with: solar dynamos, solar shape, convection zone, solar pulsations, solar activity, solar atmosphere, solar corona, solar spectra, solar prominences, solar flares, UV spectra, solar w…

Oblique Emission of Whistler-Mode Waves around Interplanetary Shocks

Balogh, A.; Forsyth, R. J.; Scime, E. E. +4 more

We present a study of whistler-mode wave generation and wave particle interaction in the vicinity of interplanetary shocks as observed by the Ulysses spacecraft. Generally the whistler-mode waves (measured in the frequency range 0.22-448 Hz) are observed downstream of the shocks where they persist for some hours. From the electron distribution fun…