Solar Physics Division Meeting 2000, June 19-22
Session 1. Helioseismology, Magnetic Fields, Chromosphere and Transition Region
Display, Chair: C. U. Keller, Monday-Thursday, June 19, 2000, 8:00am-6:00pm, Forum Ballroom

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[1.39] Synoptic Magnetic Field Measurements

J.T. Hoeksema (HEPL @ Stanford), R.I. Bush, K.-C. Chu, Y. Liu, P.H. Scherrer, J. Sommers, X.P. Zhao (Stanford), SOHO/MDI Team

Frequent MDI measurements of the photospheric magnetic field make possible new kinds of synoptic data sets that provide insight into the global evolution of solar activity. Synoptic charts can be constructed at central meridian or at other disk longitudes to characterize the development of the surface field and to compare with other kinds of synoptic measurements. Individual magnetograms inserted into a synoptic chart provide a better snapshot of the field configuration and provide a clearer record of changes in the global field. Daily changes can be used for prediction. Development of structures during the rising phase of Solar Cycle 23 are compared with data from other sources and other cycles. Issues of accuracy, precision, and magnetogram merging are discussed.

SOHO is a project of international cooperation between ESA and NASA.

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