Distribution and solar wind control of compressional solar wind‐magnetic anomaly interactions observed at the Moon by ARTEMIS
Autor: | Jasper Halekas, Charles Lue, J. P. McFadden, Andrew R. Poppe, W. M. Farrell |
---|---|
Rok vydání: | 2017 |
Předmět: |
010504 meteorology & atmospheric sciences
Ecliptic Geophysics Wake 01 natural sciences Article Lunar limb Physics::Geophysics Magnetic field Foreshock Solar wind Space and Planetary Science Physics::Space Physics 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Interplanetary magnetic field Magnetic anomaly 010303 astronomy & astrophysics Geology 0105 earth and related environmental sciences |
Zdroj: | J Geophys Res Space Phys |
ISSN: | 2169-9402 2169-9380 |
Popis: | A statistical investigation of five years of observations from the two-probe Acceleration, Reconnection, Turbulence, and Electrodynamics of Moon's Interaction with the Sun (ARTEMIS) mission reveals that strong compressional interactions occur infrequently at high altitudes near the ecliptic, but can form in a wide range of solar wind conditions and can occur up to two lunar radii downstream from the lunar limb. The compressional events, some of which may represent small-scale collisionless shocks (“limb shocks”), occur in both steady and variable interplanetary magnetic field (IMF) conditions, with those forming in steady IMF well organized by the location of lunar remanent crustal magnetization. The events observed by ARTEMIS have similarities to ion foreshock phenomena, and those observed in variable IMF conditions may result from either local lunar interactions or distant terrestrial foreshock interactions. Observed velocity deflections associated with compressional events are always outward from the lunar wake, regardless of location and solar wind conditions. However, events for which the observed velocity deflection is parallel to the upstream motional electric field form in distinctly different solar wind conditions and locations than events with anti-parallel deflections. Consideration of the momentum transfer between incoming and reflected solar wind populations helps explain the observed characteristics of the different groups of events. |
Databáze: | OpenAIRE |
Externí odkaz: |