Science & Technology

October 7, 2010

InterplanetalyHighways 300x168 Science & TechnologyInterplanetary Superhighways

…A solar freeway through space…

Conceived by Martin Lo, the Interplanetary Superhighway theory is currently used by NASA to design Genesis’ flight path to collect solar wind particles on its return to Earth. On April 4-6 2000 the Energetic and Relativistic Nuclei and Electron particle telescope on the SOHO (Solar and Heliospheric Observatory) spacecraft observed a major SEP (Solar Energetic Particle) event associated with two CMEs (Coronal Mass Ejections) separated by approximately 8 hr.
The first CME was accompanied by a low-frequency type II radio burst observed by the WAVES receivers on the Wind spacecraft.

HERNHed Science & TechnologyAnalysis of the high-precision measurements of the ~20 MeV proton flux anisotropy, model fitting of the type II dynamic spectrum, and SEP transport modeling support the idea that the shock wave of the first CME was an efficient accelerator for ~20 MeV protons during only the first 6 hr after the launch.
This shock gradually slowed down, weakened, and became transparent for the protons produced by the second eruption behind the previous CME.
The main production of SEPs due to the two successive eruptions continued together for 12 hr. The near-Earth SEP event was additionally amplified by the SEP mirroring in the interplanetary magnetic field draping at the edge of an old CME beyond the Earth’s orbit, which made the SEP intensity-time profiles more prolonged than would be expected based on the assumption of SEP transport in the standard solar wind.

Lo’s and Howell’s work on the Interplanetary Superhighway for space mission design was nominated for an annual Discover Innovation Award by Discover magazine editors and an outside panel of experts.

indice annunci indice annunci indice annunci indice annunci indice annunci indice annunci indice annunci