Charge Dependence of Cosmic Ray Solar Modulation

宇宙线太阳调制的电荷依赖性

• 批准号: 9632323
• 负责人: John Clem
• 金额: $ 24.5万
• 依托单位: Bartol Research Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-11-15 至 1999-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9632323&HistoricalAwards=false
• 关键词: Charge; Dependence; Cosmic; Ray; Solar

Magnetic field irregularities carried by the solar wind sweep charged particles out of the solar system and cause the anti-correlation between cosmic ray fluxes and the level of solar activity. Since electrons and nuclei have greatly different charge/mass ratios, the relation of velocity and magnetic rigidity is significantly different for these two particle species. If the heliospheric magnetic field has long range order, the charge sign of cosmic ray particles can affect their propagation. Recent observations show that a major failure of current modulation models simultaneously reproducing electron and nucleon modulation is related to reversals of the solar magnetic field, which occur every eleven years. Charge dependence, then, should change when the solar field reverses, but differently from that observed. The PIs will conduct a research program extending measurements of charge dependence of cosmic ray solar modulation with a series of balloon flights to determine the time dependence of electron and positron fluxes over a broad energy range. This investigation will determine the importance of large scale order of the heliospheric magnetic field in determining trajectories of charged particles in the heliosphere.

太阳能扫除带电颗粒从太阳系中带出的磁场不规则性，并导致宇宙射线通量与太阳能活动水平之间的抗相关性。 由于电子和核具有大大不同的电荷/质量比，因此这两个粒子物种的速度和磁性刚度的关系显着差异。 如果Heliospheric磁场具有长距离顺序，则宇宙射线颗粒的电荷符号会影响它们的传播。 最近的观察结果表明，同时再现电子和核子调制的当前调制模型的重大故障与太阳磁场的逆转有关，这每11年就会发生。 那么，当太阳能倒流逆转时，电荷依赖性应改变，但与观察到的不同。 PI将通过一系列气球飞行来扩大宇宙射线太阳能调制的电荷依赖性测量，以确定电子和正电子通量在广泛的能量范围内的时间依赖性。 这项研究将确定地层磁场的大规模顺序在确定地球层中带电颗粒的轨迹方面的重要性。