SPATIALLY DEPENDENT HEATING AND IONIZATION IN AN ICME OBSERVED BY BOTH ACE AND ULYSSES

• Published in: The Astrophysical journal 2012-12, Vol.760 (2), p.1-15
• Main Authors: LEPRI, Susan T, MARTIN LAMING, J, RAKOWSKI, Cara E, VON STEIGER, Rudolf
• Format: Article
• Language: English
• Subjects: ASTRONOMY; ASTROPHYSICS; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; Balancing; COMPARATIVE EVALUATIONS; Coronal mass ejection; Earth, ocean, space; Exact sciences and technology; Flanks; Heating; HEAVY IONS; IONIZATION; Magnetic clouds; MASS; SOLAR CORONA; SOLAR FLARES; SOLAR WIND; SPACE DEPENDENCE; Spacecraft; SUN; TIME DEPENDENCE; VARIATIONS
• ISSN: 0004-637X; 1538-4357
• DOI: 10.1088/0004-637X/760/2/105

The 2005 January 21 interplanetary coronal mass ejection (ICME) observed by multiple spacecraft at L1 was also observed from January 21-February 4 at Ulysses (5.3 AU). Previous studies of this ICME have found evidence suggesting that the flanks of a magnetic cloud like structure associated with this ICME were observed at L1 while a more central cut through the associated magnetic cloud was observed at Ulysses. This event allows us to study spatial variation across the ICME and relate it to the eruption at the Sun. In order to examine the spatial dependence of the heating in this ICME, we present an analysis and comparison of the heavy ion composition observed during the passage of the ICME at L1 and at Ulysses. Using SWICS, we compare the heavy ion composition across the two different observation cuts through the ICME and compare it with predictions for heating during the eruption based on models of the time-dependent ionization balance throughout the event.