Collaborative Research: Arecibo Radar Studies of Zodiacal and Interstellar Dust in the Solar System

AST 0205974 meiseldr。纽约州立大学Geneseo分校的David Meisel将与宾夕法尼亚州立大学的John Mathews博士合作，在阿雷西博天文台进行的雷达微流星观测的基础上，对太阳系中的小粒子进行为期3年的观测和分析/建模研究。在~0.2-100微米尺寸范围内的行星际尘埃粒子（IDPs）的分布、来源、引力和电动力学演化的知识对行星科学至关重要，对局部星系科学也至关重要。阿雷西博天文台（AO）的超高频雷达已被证明是唯一适合于地面微流星观测的雷达，它可以获得大量行星际和双曲尘埃粒子的速度、减速和辐射信息，从而获得它们的轨道。现在的观测结果从1997年一直延伸到现在，采用了一种稳定发展的技术，现在流星体的多普勒速度的瞬时精度小到10米/秒（到目前为止流星体的速度超过10-90公里/秒）。这与基于经典大气流星体动力学的分类机制相结合，清楚地区分了光束向下的粒子和那些具有显著的光束横向速度分量的流星体。新的努力将这些研究扩展到太阳系中IDP分布/演化的细节，并考虑星际粒子通量对太阳系的作用以及由该通量照亮的局部星系过程/特征。新的观测/分析/建模研究将继续提供IDPs的常规采样，包括预期的穿越地球的小行星轨道粒子，星际粒子（isp），木星扰动和/或衍生粒子，以及由内太阳系辐射压力喷射的低质量b粒子。随着isp数据库的增长，这些研究人员将继续对最大的星际粒子的通量和起源进行理论/建模研究。到目前为止，他们可以解释所有的AO isp都是产生Geminga脉冲星的同一颗超新星的产物。这项工作包括并将继续包括来自纽约州立大学-杰内塞奥分校、宾夕法尼亚州立大学和其他机构的本科生、宾夕法尼亚州立大学的研究生以及阿雷西博天文台和其他组织的工作人员。这些努力的结果出现在Geneseo和宾夕法尼亚州立大学的几门课程中，包括电磁学、天体物理学和等离子体学

AST 0205974MeiselDr. David Meisel, at State University of New York at Geneseo, in collaboration with Dr. John Mathews, at Penn State University, will conduct a 3-year observational and analysis/modeling study of small particles in the Solar System based on radar micrometeor observations performed at the Arecibo Observatory. Knowledge of the distribution, sources, and gravitational, electrodynamical evolution of interplanetary dust particles (IDPs) in the ~0.2-100 micron size range is critical to the planetary sciences and-as extrasolar and interstellar particles are also present-to local galactic science. The Arecibo Observatory (AO) UHF radar has proven to be uniquely suited for ground-based micrometeor observations that yield velocity, deceleration, and radiant information-and thus orbits-of large numbers of interplanetary and hyperbolic dust particles. Observational results now extend from 1997 through the present with a steadily evolving technique that now yields meteoroid Doppler speeds with instantaneous accuracies of as small as 10 m/sec (with meteoroid speeds ranging over 10-90 km/sec thus far). This combined with a sorting mechanism based on classical, in-atmosphere meteoroid dynamics, clearly distinguishes down-the-beam particles from those meteoroids with a significant across-the-beam velocity component. The new effort extends these studies to details of IDP distribution/evolution in the solar system and considers the role of the interstellar particle flux to the solar system as well as local galactic processes/features illuminated by this flux.The new observational/analysis/modeling study funded with this award will continue providing routine sampling of IDPs including the expected earth-crossing asteroidal-orbit particles, interstellar particles (ISPs), Jovian perturbed and/or derived particles, and low-mass b particles ejected by radiation pressure from the inner solar system. As the database of ISPs grows, these researchers will continue theoretical/modeling studies of the flux and origins of the largest of the interstellar particles. Thus far they can account for all AO ISPs as being products of the same supernova thatproduced the Geminga pulsar. This effort has involved and will continue to involve undergraduates from SUNY-Geneseo, Penn State, and other institutions and graduate students from Penn State as well as the staff of Arecibo Observatory and other organizations. Results from these efforts appear in several courses including electromagnetics, astrophysics, and plasmas at both Geneseo and Penn State.***