Electron temperature and density relationships in coronal mass ejections

Details Electron temperature and density relationships in coronal mass ejections Electron temperature and density relationships in coronal mass ejections

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf..100h&link_type=abstract

Los Alamos National Lab., International Solar Wind 8 Conference, p. 100

Physics

Stellar Mass Ejection, Electron Energy, Electron Density (Concentration), Solar Wind, Magnetic Clouds, Ulysses Mission, Protons, Dense Plasmas, Collisions, Cooling

Scientific paper

We examine 10 coronal mass ejections from the in-ecliptic portion of the Ulysses mission. Five of these CMEs are magnetic clouds. In each case we observe an inverse relationship between electron temperature and density. For protons this relationship is less clear. Earlier work has shown a similar inverse relationship for electrons inside magnetic clouds and interpreted it to mean that the polytropic index governing the expansion of electrons is less than unity. This requires electrons to be heated as the CME expands. We offer an alternative view that the inverse relationship between electron temperature and density is caused by more rapid cooling of the denser plasma through collisions. More rapid cooling of denser plasma has been shown for 1 AU measurements in the solar wind. As evidence for this hypothesis we show that the denser plasma inside the CMEs tends to be more isotropic indicating a different history of collisions for the dense plasma. Thus, although the electron temperature inside CMEs consistently shows an inverse correlation with the density, this is not an indication of the polytropic index of the plasma but instead supports the idea of collisional modification of the electrons during their transit from the sun.

Affiliated with

Also associated with

No associations

Rating

Electron temperature and density relationships in coronal mass ejections 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 Electron temperature and density relationships in coronal mass ejections, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electron temperature and density relationships in coronal mass ejections will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-760343