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| Paper: |
Hinode/EIS Line Profile Asymmetries and Their Relationship
with the Distribution of SDO/AIA Propagating Coronal Disturbance Velocities |
| Volume: |
455, 4th Hinode Science Meeting: Unsolved Problems and Recent Insights |
| Page: |
361 |
| Authors: |
Sechler, M.; McIntosh, S. W.; Tian, H.; De Pontieu, B. |
| Abstract: |
Using joint observations from Hinode/EIS and the Atmospheric Imaging
Array (AIA) on the Solar Dynamics Observatory (SDO) we explore the
asymmetry of coronal EUV line profiles. We find that asymmetries exist
in all of the spectral lines studied, and not just the hottest lines
as has been recently reported in the literature. Those asymmetries
indicate that the velocities of the second emission component are
relatively consistent across temperature and consistent with the
apparent speed at which material is being inserted from the lower
atmosphere that is visible in the SDO/AIA images as propagating
coronal disturbances. Further, the observed asymmetries are of similar
magnitude (a few percent) and width (determined from the RB analysis)
across the temperature space sampled and in the small region
studied. Clearly, there are two components of emission in the
locations where the asymmetries are identified in the RB analysis,
their characteristics are consistent with those determined from the
SDO/AIA data. There is no evidence from our analysis that this second
component is broader than the main component of the line. |
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