Plasma Wave Observations by Ulysses During its Fast Latitude Scans

Physics

Scientific paper

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7536 Solar Activity Cycle (2162), 7871 Waves And Instabilities, 2159 Plasma Waves And Turbulence

Scientific paper

The Ulysses spacecraft observes several plasma wave modes in the solar wind, including the Langmuir mode, ion-acoustic mode, and whistler mode. For each of the observed modes, we examine and compare the intensities and occurrence probabilities for the two Ulysses fast latitude scans. The first scan, occurring in late 1994 and early 1995, was near the minimum of solar activity. The second scan, occurring during 2001, was near the maximum in solar activity. Numerous factors play a role in the level of wave activity observed at the spacecraft - the number and latitudinal extent of solar transients, the inclination of the current sheet, the extent of fast solar wind from polar coronal holes, etc. The variations of these parameters from solar minimum to maximum provide reasonable explanations for the changing occurrence and intensity of the wave modes. Consequences for spacecraft field and particle observations will be discussed

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