A Magnetic Cloud Observed by both ACE and Ulysses
The chance of a magnetic cloud being observed by widely-separated spacecraft is rare. However, such an event provides us a unique opportunity to study the propagation and evolution of magnetic cloud in the interplanetary space. At the end of February 1999, the ACE (～1 AU) and the Ulysses (～5.1 AU) were at nearly the same longitude. A magnetic cloud event observed by ACE at Earth on February 18-19, 1999 is tracked from the location of ACE to Ulysses. Using a one-dimensional MHD solar wind model, we propagate the ACE data to the location of Ulysses, and confirm that the two magnetic clouds observed by both spacecraft have the same solar origin. The GradShaffanov (GS) reconstruction technique is then employed to recover the 2.5-D cross sections of the magnetic clouds at locations of ACE and Ulysses, respectively. The magnetic clouds observed at ACE and Ulysses both show magnetic flux-rope configurations of the same chirality.
Magnetic cloud propagation MHD Grad-Shafranov reconstruction
Dan Du
National Center for Space Weather, China Meteorological Administration, Beijing 100081, China State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China
国际会议
南京
英文
1-6
2010-05-08（万方平台首次上网日期，不代表论文的发表时间）