Beryllium 10 in Marine Sediments as an Indicator of Past Changes in Cosmic-Ray Flux Due to Terrestrial and Extra- Terrestrial Processes

海洋沉积物中的铍 10 作为过去由于陆地和地外过程引起的宇宙射线通量变化的指标

• 批准号: 9322325
• 负责人: Paul Damon
• 金额: $ 12.66万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-15 至 1998-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9322325&HistoricalAwards=false
• 关键词: Beryllium; 10; Marine; Sediments; Indicator

Project Summary Damon/9322325 The proposed project will measure samples of the beryllium 10 pulses. The investigators will also measure beryllium 10 at a geomagnetic excursion that has not yet been named. Beryllium 10 concentrations are related to intensity of the geomagnetic field. The large area and long residence time of the ocean tends to integrate the effect of changes in the geomagnetic field on a quasi-global scale while acting as a low-pass filter suppressing the effect of century-scale changes in solar activity. Thus, measurements of beryllium 10 will be made in the outer Blake Ridge core at regular intervals to evaluate changes in the geomagnetic field intensity and establish the base level for the beryllium 10 production rate anomalies related to changes in the intensity of the galactic cosmic-ray flux.

项目概述Damon/9322325提议的项目将测量铍10脉冲的样本。研究人员还将在一次尚未命名的地磁偏移中测量铍- 10。铍10的浓度与地磁场的强度有关。海洋的大面积和长停留时间倾向于在准全球尺度上整合地磁场变化的影响，同时作为一个低通滤波器抑制太阳活动的世纪尺度变化的影响。因此，将定期在布雷克岭外核进行铍10的测量，以评估地磁场强度的变化，并建立与银河系宇宙射线通量强度变化相关的铍10产率异常的基准水平。