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| Paper: |
A First Look at Magnetic Field Data Products from SDO/HMI |
| Volume: |
455, 4th Hinode Science Meeting: Unsolved Problems and Recent Insights |
| Page: |
337 |
| Authors: |
Liu, Y.; Scherrer, P. H.; Hoeksema, J. T.; Schou, J.; Bai, T.; Beck, J. G.; Bobra, M.; Bogart, R. S.; Bush, R. I.; Couvidat, S.; Hayashi, K.; Kosovichev, A. G.; Larson, T. P.; Rabello-Soares, C.; Sun, X.; Wachter, R.; Zhao, J.; Zhao, X. P.; Jr., T. L. D.; DeRosa, M. L.; Schrijver, C. J.; Title, A. M.; Centeno, R.; Tomczyk, S.; Borrero, J. M.; Norton, A. A.; Barnes, G.; Crouch, A. D.; Leka, K. D.; Abbett, W. P.; Fisher, G. H.; Welsch, B. T.; Muglach, K.; Schuck, P. W.; Wiegelmann, T.; Turmon, M.; Linker, J. A.; Mikić, Z.; Riley, P.; Wu, S. T. |
| Abstract: |
The Helioseismic and Magnetic Imager
(HMI; Scherrer & Schou 2011) is one of the three instruments
aboard the Solar Dynamics Observatory (SDO) that was launched on
February 11, 2010 from Cape Canaveral, Florida. The instrument began
to acquire science data on March 24. The regular operations started on
May 1. HMI measures the Doppler velocity and line-of-sight magnetic
field in the photosphere at a cadence of 45 seconds, and the vector
magnetic field at a 135-second cadence, with a 4096× 4096
pixels full disk coverage. The vector magnetic field data is usually
averaged over 720 seconds to suppress the p-modes and increase the
signal-to-noise ratio. The spatial sampling is about 0".5 per
pixel. HMI observes the Fe i 6173 Å absorption line, which
has a Landé factor of 2.5. These data are further used to produce
higher level data products through the pipeline at the HMI-AIA Joint
Science Operations Center (JSOC) – Science Data Processing (Scherrer et al. 2011) at Stanford University. In this paper, we briefly
describe the data products, and demonstrate the performance of the
HMI instrument. We conclude that the HMI is working extremely well. |
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