Latitudinal and Radial Variation of Shock Associated \geq 30 KeV Ion Spectra and Anisotropies at Voyagers 1 and 2

Details Latitudinal and Radial Variation of Shock Associated \geq 30 KeV Ion Spectra and Anisotropies at Voyagers 1 and 2 Latitudinal and Radial Variation of Shock Associated \geq 30 KeV Ion Spectra and Anisotropies at Voyagers 1 and 2

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ssrv...72..353k&link_type=abstract

Space Science Reviews, Volume 72, Issue 1-2, pp. 353-358

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Scientific paper

The spectra and anisotropies of ions ≥30 keV have been measured by the Low Energy Charged Particle experiment on Voyagers 1 and 2 in the vicinity of interplanetary shocks between radial distances of 1 55 AU and heliographic latitudes 11° S-32° N. The spectra and anisotropies associated with a recent corotating (CIR) event at low latitude observed at Voyager 2 (36.6 AU, -9°) are similar to those of another event at high latitude observed at Voyager 1 (49.8 AU, 33.5°). An earlier CIR event observed at Voyager 2 (14 AU) associated with the previous solar cycle produced spectra and anisotropies remarkably similar to the more recent events. The anisotropies are used to calculate the solar wind velocity downstream of shocks where possible using the Compton-Getting effect, allowing the determination of previously unknown velocities at the locations of Voyager 1. For the large shock event observed at Voyagers 1 (38 AU, 30°) and 2 (29 AU, 3°) in mid-1989, the postshock spectra and anisotropies are well described by convected power law distributions. The Voyager 1 and 2 postshock spectra ˜4 days after the shock passage are nearly identical. The preshock anisotropies at low energy are similar, despite differences in the magnetic field orientation and the low energy spectrum. We find that the ≥30 keV ion anisotropies are generally well described by convective distributions downstream but not in the upstream region for shocks and many other shock events at Voyagers 1 and 2.

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