This project will attempt to compare helioseismic properties of the sun obtained from SOI observations with the helisoseismic properties obtained from simultaneous ground-based observations obtained with the Mt. Wilson- Crimean High-L Helioseismic Network. Now that the Crimean station is nearly operational with a spatial resolution of 488x488 pixels (as well as the future capability to be upgraded to a spatial resolution of 1024x1024 pixels), we can begin to plan for the acquistion of ground-based observations of solar full-disk filtergrams and dopplergrams from both stations during the SOHO mission. While the data coverage from the two ground-based stations will not be as high as that to be obtained during the two-month dynamics observation datasets with the SOI, the coverage from the two stations should exceed that available during the remainder of each year when the SOHO spacecraft will only be tracked for approximately eight hours per day.
We plan to synchronize the acquisiton times of both ground-based stations closely to the acquistion times of the SOI observations. We plan to them analyze our ground-based observations both independently of the SI observations and also in a mode where we try to intersperse SOI and ground-based observations into more complete time series of Dopplergrams.
We plan to investigate the internal structure and angular velocity through inversions of the ground-based and combined datasets and to then compare the results of these inversions with those from the SOI observations alone. We also plan to compare the frequencies obtained from both the SOI and ground-based observations with each other to look for posssible systematic differences and we also plan to compare both sets of frequencies with those obtained at Mt. Wilson for the high-degree p-modes prior to the start of the SOI dataset.
No additional text was submitted for this proposal.