Dynamics of Interplanetary Shock Waves

我们研究了在第23太阳周期上升阶段(1997-1998年)观测到的与CME相关的行星际扰动的三维传播特性。数据来源是航天器和行星际闪烁(IPS)观测获得的太阳风数据。1997年11月初观测到的日冕物质抛射的行星际后果被发现具有类似的形态：沿黄道面附近运行的日球层电流片的传播速度局部最低的广泛的行星际扰动。这与1998年4月至5月观测到的行星际扰动形成了鲜明的对比，后者往往局限于发生相关太阳事件的半球内。主要结论如下：(1)IPS观测对行星际亮星(高密度？)(2)在第23太阳周期的非常早期阶段(1997年11月)，观测到了在经纬度范围广泛的日冕物质抛射和相关的行星际扰动。在此期间，位于太阳赤道面附近的日球层电流片中，这些扰动的传播速度普遍较低。(3)1998年，日球层电流片开始发生较大的南北漂移，观测到位于南北半球的日冕物质抛射。(4)沿日球层电流片发生大而明亮的日冕物质抛射。

We examine three-dimensional propagation properties of CME-associated interplanetary disturbances observed in the ascending phase of the Solar Cycle 23 (1997-1998). Data sources are solar wind data obtained by spacecraft and IPS (interplanetary scintillation) observations. Interplanetary consequences of CMEs observed in early November 1997 are found to have similar configurations ; broad interplanetary disturbances with the local minimum of the propagation speed along the heliospheric current sheet, which was running near the ecliptic plane. This makes a clear contrast with interplanetary disturbances observed in April-May 1998, which are tend to be confined within the hemisphere where the relevant solar events take place. Principal conclusions are as follows :(1) IPS observation is sensitive to interplanetary counterpart of bright (high-density?) portion of a CME.(2) In very early stage of the Solar Cycle 23 (Nov. 1997), CMEs and associated interplanetary disturbances with the broad extent both in the longitude and the latitude were observed. The propagation speeds of these disturbances were generally low in the heliospheric current sheet which was located near the solar equatorial plane in this period.(3) In 1998, the heliospheric current sheet started to make a large north-south excursion, and CMEs localized in either of the northern and the southern hemisphere were observed.(4) Large and bright CMEs took place along the heliospheric current sheet.