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

合作研究：阿雷西博雷达对太阳系黄道带和星际尘埃的研究。

• 批准号: 0205848
• 负责人: John Mathews
• 金额: $ 20.6万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-01 至 2006-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0205848&HistoricalAwards=false
• 关键词: Collaborative; Research; Arecibo; Radar; Studies

AST 0205848MathewsDr. John Mathews, at Penn State University, in collaboration with Dr. David Meisel, at State University of New York at Geneseo, 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.***

AST 0205848马修斯博士。宾夕法尼亚州立大学的约翰·马修斯 (John Mathews) 与纽约州立大学杰纳西奥分校的大卫·梅塞尔 (David Meisel) 博士合作，将根据雷达微流星观测对太阳系中的小颗粒进行为期 3 年的观测和分析/建模研究在阿雷西博天文台。了解大约 0.2-100 微米尺寸范围内的行星际尘埃粒子 (IDP) 的分布、来源以及引力、电动演化对于行星科学至关重要，而且对于当地银河科学来说，因为太阳系外和星际粒子也存在。阿雷西博天文台 (AO) 超高频雷达已被证明特别适合地面微流星观测，可产生大量行星际和双曲线尘埃颗粒的速度、减速度和辐射信息，从而产生轨道信息。观测结果从 1997 年延续到现在，技术不断发展，现在可以产生瞬时精度低至 10 m/s 的流星体多普勒速度（迄今为止流星体速度范围超过 10-90 km/s）。这与基于经典大气内流星体动力学的分类机制相结合，可以清楚地将顺射束粒子与具有显着横射束速度分量的流星体区分开来。 新的工作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该通量所阐明的局部银河过程/特征。新的观测/分析/建模该奖项资助的研究将继续提供国内流离失所者的常规采样，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/或派生粒子以及低质量粒子b 因辐射压力从太阳系内部喷射出的粒子。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，他们可以将所有 AO ISP 视为产生 Geminga 脉冲星的同一颗超新星的产物。 这项工作已经并将继续涉及纽约州立大学杰纳西奥分校、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多个课程中，包括电磁学、天体物理学和等离子体。***