Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh51a..08l&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH51A-08
Other
7871 Waves And Instabilities, 2149 Mhd Waves And Turbulence, 2159 Plasma Waves And Turbulence, 2162 Solar Cycle Variations (7536), 2164 Solar Wind Plasma
Scientific paper
We present observations of VLF waves (0.2 to 448 Hz) made by Ulysses during its second orbit (near the solar maximum), and compare the observations with those during the first orbit (solar minimum). From the begining of 1998, the Sun was approaching maximum activity conditions. Ulysses has been mostly in the slow and intermediate solar wind (300 - 550 km/s). The properties of wave activity are found to be very similar to those observed at low and middle latitudes during solar minimum periods: Enhanced electromagnetic waves in the whistler frequency range are observed near interplanetary shocks and heliospheric current sheet crossings and other solar wind turbulence. These waves are most intense in compression regions of high-speed stream interfaces, which were observed in periods of increasing solar wind velocity. Enhanced electric fluctuations with little or no magnetic fluctuation are often observed at < 10 Hz frequencies. These electrostatic waves often occurred in the expanding solar wind, i.e., in periods of decreasing solar wind velocity and relatively low electron heat flux. The intensities (the maximum power) of the above electric and magnetic waves for the two solar cycle periods are generally comparable. These similarities suggest that the plasma conditions for the waves' excitation are basically the same for the slow and intermediate solar wind in both solar maximum and minimum phases.
Lin Nan
Macdowall Robert J.
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