The Evolution Of The Brightness Of The White Light Corona Over A Solar Cycle

Details The Evolution Of The Brightness Of The White Light Corona Over A Solar Cycle The Evolution Of The Brightness Of The White Light Corona Over A Solar Cycle

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.

Affiliated with

Also associated with

No associations

Rating

The Evolution Of The Brightness Of The White Light Corona Over A Solar Cycle does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Evolution Of The Brightness Of The White Light Corona Over A Solar Cycle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Evolution Of The Brightness Of The White Light Corona Over A Solar Cycle will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1782021