ULYSSES observations of open and closed magnetic field lines within a coronal mass ejection.

Details ULYSSES observations of open and closed magnetic field lines within a coronal mass ejection. ULYSSES observations of open and closed magnetic field lines within a coronal mass ejection.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...316..493b&link_type=abstract

Astronomy and Astrophysics, v.316, p.493-498

Astronomy and Astrophysics

Astrophysics

19

Sun: Corona, Particle Emission, Magnetic Field, Interplanetary Medium

Scientific paper

During the rapid passage from the Sun's south to north polar regions, the Ulysses spacecraft encountered in February 1995, at 24°S, a coronal mass ejection (CME) exactly at the time when it crossed from high speed solar wind coronal hole flow into low speed streamer belt flows. We have investigated this CME, which was superimposed on an energetic particle event associated with a corotating interaction region (CIR), using energetic particle, plasma and magnetic field measurements. Ulysses' entry into the CME was accompanied by a strong decrease in the intensity of 1-3MeV protons. The leading portion of the CME with a helical magnetic flux rope topology characteristic of magnetic clouds apparently consisted of closed magnetic loops as indicated by counterstreaming suprathermal electron fluxes along the interplanetary magnetic field (IMF) and bi-directional streaming 0.4-0.7MeV ions. In contrast, the absence of counterstreaming electrons and ions, the presence of sunward streaming 0.4-5MeV ions and sunward bursts of suprathermal electrons at energies from ~40eV up to several 100eV inside another portion of the CME suggest that here the magnetic field lines were "open" i.e., with only one end rooted in the solar corona. These field lines were most likely connected to the reverse shock of a CIR beyond Ulysses. We suggest that 3-dimensional reconnection processes are responsible for the formation of magnetic flux rope CMEs from rising coronal loops leading to open and closed field topologies.

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