LWS Science Team Meeting, 23 Mar 2004, Boulder 1

Using HMI to Study Facular Contrast

Functions

Thomas BergerBerger@lmsal.com

SDO Workshop14 Feb 2006

HMI Magnetograms

LWS Science Team Meeting, 23 Mar 2004, Boulder 2

TSI from Spots and Faculae

LWS Science Team Meeting, 23 Mar 2004, Boulder 3

Prior Measurements

MDI 676.8 nm continuum dataOrtiz, Solanki, et al.A&A, 2002

Spatial resolution = 2”

SVST 630.2 nm continuum dataTopka, Tarbell, et al.ApJ, 1997

Spatial resolution = 0.5” = 0.31 – 0.996

LWS Science Team Meeting, 23 Mar 2004, Boulder 4

New Measurements

SST G-bandAR 1037706-June-2003 = 0.6 = 53°

LWS Science Team Meeting, 23 Mar 2004, Boulder 5

New Measurements

SST 630.25nmAR 1037706-June-2003 = 0.6 = 53°

LWS Science Team Meeting, 23 Mar 2004, Boulder 6

Replication of prior results

Topka et al., ApJ 1997

LWS Science Team Meeting, 23 Mar 2004, Boulder 7

Using High Resolution

LWS Science Team Meeting, 23 Mar 2004, Boulder 8

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. • Continuum contrast vs. field strength vs. • Line center contrast vs. same