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Comparison of IUE and HST diagnostics of the Jovian Aurorae

Livengood, T.; Harris, W. M.; Prangé, R. +2 more

Analysis of international ultraviolet explorer (IUE) and Voyager ultraviolet spectrometer (UVS) spectra of the Jovian auroral emission indicates that the Jovian auroral brightness is modulated in longitude (brighter near 180° in the north and 20° in the south) and that there is a color ratio asymmetry associated with this brightening. The purpose …

Three-dimensional nature of interaction regions: Pioneer, Voyager, and Ulysses solar cycle variations from 1 to 5 AU

Smith, Edward J.; González-Esparza, J. Américo

We combined in-ecliptic observations of interaction regions from 1 to 5 AU by four spacecraft that traveled to Jupiter at different phases of the solar cycle: Pioneer 11 (declining phase of cycle 20), Voyager 1 and 2 (ascending phase of cycle 21), and Ulysses (just after solar maximum 22). We used this set of 97 interaction regions to study two di…

Spatial variations of 0.2 to 5 MeV protons in the 1-5 AU in-ecliptic region from Ulysses, Voyager 1 and 2, and IMP 8 gradient studies

Armstrong, Thomas P.; Boufaida, Moncef

Protons with energies ranging from 0.3 to 2 MeV are nearly always present in the environment of Earth. Solar flare events and interplanetary shock waves can be identified as producing or enhancing these fluxes. However, interplanetary particles are observed even in the absence of solar flares. Explaining the presence of these proton fluxes in the …

Three-dimensional nature of interaction regions: Pioneer, Voyager, and Ulysses solar cycle variations from 1 to 5 AU

Smith, Edward J.; Américo González-Esparza, J.

Solar origin of the 26-day periodicity observed by Ulysses

Weber, M.; Hoeksema, J. T.; Acton, L. W. +1 more

The Ulysses spacecraft discovered that the interplanetary magnetic sector structure went through a major restructuring in mid-1992. The observed recurrence period changed from about 25.4 days to about 26.2 days. Another interesting discovery is that the solar wind speed, energetic particle fluxes, and interplanetary magnetic field all varied quasi…

Plasma wave characteristics of the jovian magnetopause boundary layer: Can wave-particle interactions cause the jovian aurora?

Krupp, N.; Balogh, A.; Tsurutani, B. T. +10 more