Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh13c..04h&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH13C-04
Astronomy and Astrophysics
Astrophysics
[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle
Scientific paper
The LASCO C2 and C3 coronagraphs on the SOHO mission have been operating almost continuously since 1996. This long period covers two solar minima and one maximum. It has been reported that the solar wind magnetic field and pressure is abnormally low. We have asked whether there is any difference in the brightness, which is directly related to the electron content. We have generated plots of the total intensity for the entire 13 year period. Comparison over this long period is possible due to the excellent, absolute calibration of the coronagraphs using star transits. We find a solar cycle dependence of about 20%. However, we do not see a significant decrease of the current minimum compared to the previous one. Rather, the total intensity (summed over all position angles) is ~5% higher this minimum than previously due to a slightly broader streamer “belt” now than previously. In contrast, CMEs are about 2x less massive at the current minimum than the previous one. The CME average mass dramatically decreased from 2002 to 2004 by a factor of 5. This CME decrease corresponded to the average CME width becoming narrower. We note that the intensity structure of the current minimum did not achieve the simple structure of the previous minimum.
Battams K.
Howard Russ A.
Morrill Jeff S.
Stenborg Guillermo
Vourlidas Angelos
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