An Error Analysis of Oscillations in Solar Polar Coronal Hole Areas
Abstract
The results obtained from our polar coronal hole (PCH) area analysis of EUV images from the Extreme ultraviolet Imaging Telescope (EIT) on SOHO show an annual periodicity propagating through the data set. Investigations into the cause of this variability have been inconclusive. However, the frequency of the oscillation suggests that the uncertainty comes from orbital effects. We discuss the relevant orbital variations of the SOHO spacecraft and analytically determine the potential error due to those variations. These effects include the variations in solar B0 and L0 angles within the working coordinate system, and B0 projection effects of coronal material. Our goal in conducting this error analysis is to gain a better understanding of how SOHO's orbital variations affect the determination of solar coordinates, particularly at the limb and poles. This work is supported by the Solar Dynamics Observatory.
- Publication:
-
Solar Heliospheric and INterplanetary Environment (SHINE 2011)
- Pub Date:
- July 2011
- Bibcode:
- 2011shin.confE...1H