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

项目摘要Damon/9322325拟议的项目将测量铍10脉冲的样品。研究人员还将在尚未命名的地磁漂移中测量铍10。铍的浓度与地磁场的强度有关。海洋面积大、停留时间长，往往在准全球尺度上综合地磁场变化的影响，同时充当抑制太阳活动百年尺度变化影响的低通滤波器。因此，将定期在外布雷克山脊核心进行铍10的测量，以评估地磁场强度的变化，并确定与星系宇宙射线流量强度变化有关的铍10产生率异常的基准水平。

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.