We study the solar wind helium-to-hydrogen abundance’s (\(A_{ {\mathrm {He}}}\)) relationship to solar cycle onset. Using OMNI/Lo data, we show that \(A_{ {\mathrm {He}}}\) increases prior to sunspot number (SSN) minima. We also identify a rapid depletion and recovery in \(A_{ {\mathrm {He}}}\) that occurs directly prior to cycle onset. This \(A_{ {\mathrm {He}}}\) shutoff happens at approximately the same time across solar wind speeds (\(v_{\mathrm{sw}}\)) and the time between successive \(A_{ {\mathrm {He}}}\) shutoffs is typically on the order of the corresponding solar cycle length. In contrast to \(A_{ {\mathrm {He}}}\)’s \(v_{\mathrm{sw}}\)-dependent phase lag with respect to SSN (Alterman and Kasper, 2019), \(A_{ {\mathrm {He}}}\) shutofff’s concurrence across \(v_{\mathrm{sw}}\) likely implies it is independent of solar wind acceleration and driven by a mechanism near or below the photosphere. Using brightpoint (BP) measurements to provide context, we infer that \(A_{ {\mathrm {He}}}\) shutoff is likely related to the overlap of adjacent solar cycles and the equatorial flux cancelation of the older, extended solar cycle during solar minima.

我们研究了太阳风中氦与氢的丰度（\（A_ {{\ mathrm {He}}} \\））与太阳周期开始的关系。使用OMNI / Lo数据，我们显示\（A_ {{\ mathrm {He}}} \）在黑子数（SSN）最小值之前增加。我们还发现\（A_ {{\ mathrm {He}}} \\）中的快速耗竭和恢复是在周期发作之前立即发生的。此\（A_ {{\ mathrm {他}}} \）切断发生在大约横跨太阳风速度的同时（\（V _ {\ mathrm {SW}} \））和连续之间的时间\（A_ {{ \ mathrm {He}}} \）的关闭时间通常约为相应的太阳周期长度。与此相反，以\（A_ {{\ mathrm {他}}} \）的\（v _ {\ mathrm {sw}} \）-相对于SSN的相位滞后（Alterman and Kasper，2019），\（A_ {{\ mathrm {He}}} \） shutdownofff在\（v _ {\ mathrm {sw}} \）可能暗示它与太阳风的加速度无关，并且受光球附近或下方的机制驱动。使用亮点（BP）测量来提供上下文，我们推断\（A_ {{\ mathrm {He}}} \）的关闭很可能与相邻太阳周期的重叠以及较旧的，延长的太阳周期的赤道通量抵消有关在太阳极小时期。