Dynamics of Interplanetary Shock Waves

我们研究了在第23太阳活动周（1997-1998）上升阶段观测到的与日冕物质抛射相关的行星际扰动的三维传播特性。数据来源是航天器获得的太阳风数据和行星际闪烁观测数据。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结构;广泛的行星际扰动，其传播速度沿着日光层电流片在黄道面附近具有局部最小值。这与1998年4月至5月期间观测到的行星际扰动形成鲜明对比，后者往往局限于发生有关太阳事件的半球内。主要结论如下：（1）IPS观测对行星际亮（高密度？）CME的一部分。(2)1997年11月，在第23太阳活动周的极早期，观测到了CME及其伴随的行星际扰动。在这一时期，这些扰动在日球电流片中的传播速度普遍较低，而电流片位于太阳赤道面附近。(3)1998年，日球层电流片开始发生大的南北漂移，观测到了局限于北方和南半球的日冕物质抛射。(4)大而明亮的日冕物质抛射发生在沿着日光层电流片。

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.