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Title: Development of a current sheet in the wake of a fast coronal mass ejection

A bright ray that developed in the wake of a fast coronal mass ejection (CME) on 2005 September 7 presents a unique opportunity to study the early development and physical characteristics of a reconnecting current sheet (CS). Polarization brightness images from the Mk4 K-Coronameter at the Mauna Loa Solar Observatory are used to determine the structure of the ray along its axis low in the corona as it progressed outward. Coverage of the early development of the ray out to ∼1.3 R {sub ☉} for a period of ∼27 hr after the start of the event enables for the first time in white light a measurement of a CME CS from the top of the arcade to the base of the flux rope. Measured widths of the ray are combined to obtain the kinematics of the upper and lower {sup Y-}points described in reconnection flux-rope models such as that of Lin and Forbes. The time dependence of these points are used to derive values for the speed and acceleration of the growth of the CS. We note the appearance of a large structure which increases in size as it expands outward in the early development of the ray and anmore » apparent oscillation with a period of ∼0.5 hr in the position angle of the ray.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Atmospheric Environmental Research, 2201 Buena Vista Drive SE, Suite 407, Albuquerque, NM 87106 (United States)
  2. Institute for Scientific Research, Boston College, 140 Commonwealth Ave., Chestnut Hill, MA 02467 (United States)
  3. High Altitude Observatory/National Center for Atmospheric Research, Boulder, CO 80307 (United States)
  4. Space Vehicles Directorate, Air Force Research Laboratory, Sunspot, NM 88349 (United States)
Publication Date:
OSTI Identifier:
22357287
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 784; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; BRIGHTNESS; IMAGES; MASS; OSCILLATIONS; POLARIZATION; SUN; TIME DEPENDENCE; VELOCITY; VISIBLE RADIATION