Three‐dimensional estimates of the coronal electron density at times of extreme solar activity
Authors:
- 30 September 2005
- journal article
- Published by American Geophysical Union (AGU) in Journal of Geophysical Research
- Vol. 110 (A9)
Abstract
This paper presents quantitative three‐dimensional (3‐D) reconstructions of the electron density (Ne) in the solar corona between 1.14 and 2.7 solar radii (R⊙) formed from polarized brightness (pB) measurements made by the Mauna Loa Solar Observatory Mark‐IV (Mk4) K‐coronameter at the time of the extreme solar events of October and November 2003. The 3‐D reconstructions are made by a process called solar rotational tomography that exploits the view angles provided by solar rotation during a 2‐week period. Although this method is incapable of resolving dynamic evolution on timescales of less than about 2 weeks, a qualitative comparison of the reconstructions to instantaneous Extreme ultraviolet Imaging Telescope images (EIT) shows good agreement between coronal holes, active regions, and “quiet Sun” structures on the disk and their counterparts in the corona at 1.2 R⊙.Keywords
This publication has 26 references indexed in Scilit:
- On the Use of Total Brightness Measurements for Tomography of the Solar CoronaThe Astrophysical Journal, 2005
- Empirically Determined Anisotropic Velocity Distributions and Outflows of O5+Ions in a Coronal Streamer at Solar MinimumThe Astrophysical Journal, 2003
- Density and Temperature Measurements in a Solar Active RegionThe Astrophysical Journal, 2003
- Temperature and Density Measurements in a Quiet Coronal StreamerThe Astrophysical Journal, 2002
- Tomography of the Solar Corona. II. Robust, Regularized, Positive Estimation of the Three‐dimensional Electron Density Distribution from LASCO‐C2 Polarized White‐Light ImagesThe Astrophysical Journal, 2002
- Tomography of the Solar Corona. I. A Robust, Regularized, Positive Estimation MethodThe Astrophysical Journal, 2000
- Distortion of the interplanetary magnetic field by three‐dimensional propagation of coronal mass ejections in a structured solar windJournal of Geophysical Research, 1999
- The Radial and Angular Variation of the Electron Density in the Solar CoronaThe Astrophysical Journal, 1999
- Grouped-coordinate ascent algorithms for penalized-likelihood transmission image reconstructionIEEE Transactions on Medical Imaging, 1997
- Generalized Cross-Validation as a Method for Choosing a Good Ridge ParameterTechnometrics, 1979