The Evolution of Comets in the Heliosphere as Observed by SMEI

Details The Evolution of Comets in the Heliosphere as Observed by SMEI The Evolution of Comets in the Heliosphere as Observed by SMEI

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh32a..08k&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH32A-08

Physics

2101 Coronal Mass Ejections (7513), 6023 Comets: Dust Tails And Trails (6210), 6025 Interactions With Solar Wind Plasma And Fields, 6210 Comets (6023), 7999 General Or Miscellaneous

Scientific paper

Comet observations have been used as in situ probes of the heliospheric environment since they were used to confirm the existence of the solar wind. Changes in a comet tail's appearance are attributed to changes in the solar wind flow. Large scale tail disruptions are usually associated with boundary crossings of the current sheet or, more rarely, impacts from coronal mass ejections. The Solar Mass Ejection Imager (SMEI) observed three bright comets during April-May 2004: Bradfield (C/2004 F4), LINEAR (C/2002 T7), and NEAT (C/2001 Q4). We had previously reported several comet tail disconnection events (DEs) for both NEAT and LINEAR. Investigation of the entire period further reveals that these two comets showed continual changes in their plasma tails. These changes are characterized by a "smokestack-like" billowing effect punctuated by the disconnections. Bradfield however was remarkably quiescent during this entire period. We present these extended comet observations and offer an analysis and cause of the similarities and disparities of these data.

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