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We analyze the magnetic activity of 59,318 M dwarfs from the Sloan DigitalSky Survey (SDSS) Data Release 7. This analysis explores the spatialdistribution of M dwarf activity as a function of both vertical distance fromthe Galactic plane (Z) and planar distance from the Galactic center (R). Weconfirm the established trends of decreasing magnetic activity (as measured byH-alpha emission) with increasing distance from the mid-plane of the disk andfind evidence for a trend in Galactocentric radius. We measure a non-zeroradial gradient in the activity fraction in our analysis of stars with spectraltypes dM3 and dM4. The activity fraction increases with R and can be explainedby a decreasing mean stellar age with increasing distance from the Galacticcenter.

The Sloan digital sky survey data release 7 spectroscopic m dwarf catalog iii: The spatial dependence of magnetic activity in the galaxy