LASCO and EIT Observations of Helical Structure in Coronal Mass Ejections

Details LASCO and EIT Observations of Helical Structure in Coronal Mass Ejections LASCO and EIT Observations of Helical Structure in Coronal Mass Ejections

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...516..465d&link_type=abstract

The Astrophysical Journal, Volume 516, Issue 1, pp. 465-474.

Astronomy and Astrophysics

Astronomy

122

Sun: Activity, Sun: Corona, Sun: Magnetic Fields, Sun: Particle Emission

Scientific paper

Observations of coronal mass ejections (CMEs) by the Large Angle Spectrometric Coronagraph (LASCO) on the Solar and Heliospheric Observatory (SOHO) show a significant fraction with circular intensity patterns. In the past, these would have been called ``disconnection'' events, but we suggest that these are evidence of CMEs containing helical magnetic flux ropes that are often central to many theoretical models of CMEs and have been observed in magnetic clouds near 1 AU. Three examples are examined in detail with the LASCO and Extreme-Ultraviolet Imaging Telescope (EIT) data sets, which provide observations from their initiation through 30 R_solar.

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