Bow shock analysis at comets Halley and Grigg-Skjellerup

Lower Hybrid Waves Upstream of Comets and Their Implications for the Comet Halley Bow Wave

Observed and theoretical features concerning the nature of so-called cometary "bow shocks" or "bow waves" are discussed. Collective plasma effects associated with the presence of pickup ring ions (protons and water ions) in the vicinity of the supermagnetosonic to submagnetosonic transition region in the quasi-perpendicular limit are considered; the linear and nonlinear evolution of instabiliti...

Isotopic and Micro-raman Investigation of Interplanetary Dust Particles Collected during 2003 Earth Passage through Comet Grigg-skjellerup Dust

Introduction: In April 2003, NASA flew stratospheric dust collectors to coincide with the expected passage of the Earth through the dust trail of comet Grigg-Skjellerup. Whether any Grigg-Skjellerup particles were collected (along with “normal” Interplanetary Dust Particles or IDPs) and how such would be recognized is still uncertain, though there is evidence for unusual noble gases in some of ...

Isotopic and Micro-Raman investigation of Interplanetary Dust Particles Collected during 2003 Earth passage through Comet Grigg-Skjellerup Dust Stream

From interstellar dust to comets: the extended CO source in comet Halley

Some simplemolecules in comet comae like CO, C2, C3, CN, H2CO appear to be distributed in such a way that they are neither directly emitted from the nucleus surface nor created as daughter molecules from more complex gas phase species. The only remaining possible source is the organic component in comet dust. The requirements imposed on the comet dust grains by the distributed CO emission are t...

Remarkably high abundance of presolar grains in interplanetary dust particles collected from the comet Grigg-Skjellerup dust stream

Introduction: Interplanetary dust particles (IDPs) have been shown to preserve isotopic anomalies, particularly in nitrogen and hydrogen associated with molecular cloud organic material [1-3]. Furthermore, with the heightened capabilities of the NanoSIMS ion microprobe, submicrometer-sized presolar silicate grains have been identified in IDPs [3-6]. Recently, four IDPs collected during the 2003...