Propagation and evolution of a magnetic cloud from ACE to Ulysses

Details Propagation and evolution of a magnetic cloud from ACE to Ulysses Propagation and evolution of a magnetic cloud from ACE to Ulysses

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11209101d&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue A9, CiteID A09101

Physics

8

Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Coronal Mass Ejections (7513)

Scientific paper

The chance of a magnetic cloud (MC) being observed by widely separated spacecraft is rare. However, such an event provides us a good opportunity to study the propagation and evolution of magnetic cloud in the interplanetary space. A magnetic cloud event observed by ACE at Earth on 4-6 March 1998 is tracked from the location of ACE to Ulysses. Using a one-dimensional (1-D) 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 Grad-Shafranov (GS) reconstruction technique is then employed to recover the 2$\frac{1}{2-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 and unidirectional axial magnetic field along approximately the same direction. It is found that the magnetic cloud is expanding while propagating outward. Their relevant toroidal (axial) and poloidal magnetic flux contained within each flux rope are different but approximately of the same order of magnitude. However, the relative magnetic helicity contained in each flux rope differs significantly. We discuss the causes of such differences, taking into account the underestimate of the area of the flux rope at Ulysses and the effect of magnetic cloud evolution that may not be fully addressed by 2-D models.

Affiliated with

Also associated with

No associations

Rating

Propagation and evolution of a magnetic cloud from ACE to Ulysses does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Propagation and evolution of a magnetic cloud from ACE to Ulysses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Propagation and evolution of a magnetic cloud from ACE to Ulysses will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-967568