Dynamics of Interplanetary Shock Waves

行星际冲击波动力学

基本信息

批准号：
10640427
负责人：
WATANABE Takashi
金额：
$ 2.05万
依托单位：
IBARAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640427/
关键词：
Solar Physics CME solar wind interplanetary shock wave

项目摘要

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.

我们研究了在第 23 太阳周期（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IPS（行星际闪烁）观测数据。 1997 年 11 月上旬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，其传播速度沿日光层电流片（在黄道面附近运行）具有局部最小值。这与1998年4月至5月观测到的行星际扰动形成鲜明对比，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 观测对日冕物质抛射的明亮（高密度？）部分的行星际对应物很敏感。(2) 在太阳周期 23 的早期阶段（1997 年 11 月），日冕物质抛射和相关的在经度和纬度上都观测到了广泛的行星际扰动。这些扰动在这一时期位于太阳赤道面附近的日光层流片中传播速度普遍较低。 (3) 1998年，日光层流片开始出现大幅度的南北偏移，日冕物质抛射局域于北半球和南半球均有观测到。(4)沿日光层洋流片发生大而明亮的日冕物质抛射。