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vol.33 número1Evidence of plasma resonance instability from observations of solar decimetric fine structuresDescription and characterization of a ECR plasma device developed for thin film deposition índice de autoresíndice de assuntospesquisa de artigos
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Brazilian Journal of Physics

versão impressa ISSN 0103-9733versão On-line ISSN 1678-4448

Resumo

ECHER, E. et al. Interplanetary shock parameters during solar activity maximum (2000) and minimum (1995-1996). Braz. J. Phys. [online]. 2003, vol.33, n.1, pp.115-122. ISSN 0103-9733.  http://dx.doi.org/10.1590/S0103-97332003000100010.

Interplanetary shock parameters are analyzed for solar maximum (year 2000) and solar minimum (years 1995-1996) activity. Fast forward shocks are the most usual type of shock observed in the interplanetary medium near Earth's orbit, and they are 88% of the identified shocks in 2000 and 60% in 1995-1996. Average plasma and magnetic field parameters for upstream and downstream sides of the shocks were calculated, and the parameter variations through the shock were determined. Applications of the Rankine-Hugoniot equations were made, obtaining shock speeds and Alfvenic Mach number. Static and dynamic pressures variations through the shocks were also calculated. Every parameter have larger variation through the shock in solar maximum than in solar minimum, with exception of the proton density. The intensity of shocks relative to the interplanetary medium, quantified by the Alfvenic Mach Number, is observed to be similar in solar maximum and minimum. It could be explained because, during solar maximum, in despite of the higher shock speeds, the Alfvenic speed of the interplanetary medium is higher than in solar minimum.

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