HMI Magnetograms

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HMI Magnetograms
Using HMI to Study Facular Contrast Functions
SDO Workshop 14 Feb 2006
Thomas Berger Berger_at_lmsal.com
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TSI from Spots and Faculae
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Prior Measurements
MDI 676.8 nm continuum data Ortiz, Solanki, et
al. AA, 2002 Spatial resolution 2
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New Measurements
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New Measurements
SST 630.25nm AR 10377 06-June-2003 m 0.6 q 53
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Replication of prior results
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Using High Resolution
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HMI and Irradiance

• HMI Irradiance measurements
• Full-disk VECTOR magnetogram
• Continuum contrast (positions 1, 5)
• Line center contrast (position 3)
• Regular cadence (e.g. 3X per day for life of
  mission)
• Irradiance analyses
• Continuum contrast vs. flux density vs. m
• Continuum contrast vs. field strength vs. m
• Line center contrast vs. same