@article{mehltretter_proper_1979,
	title = {On the proper motions of small pores in sunspot groups.},
	volume = {63},
	issn = {0038-0938},
	url = {https://ui.adsabs.harvard.edu/abs/1979SoPh...63...61M},
	doi = {10.1007/BF00155694},
	abstract = {The possibility of measuring pore positions and proper motions with high accuracy, using time series of short exposure photographs, is discussed. Preliminary measurements of a series covering a time span of 110 min. show that positions of small pores may be defined, and horizontal velocities determined, to within 0″.1, or 30 m s−1, respectively.},
	journal = {Solar Physics},
	author = {Mehltretter, J. P.},
	month = aug,
	year = {1979},
	keywords = {Astronomical Photography, Error Analysis, Horizontal Velocity, Instrument Errors, Position Errors, Position Indicators, Proper Motion, Root-Mean-Square Errors, Short Exposure, Solar Activity Cycles, Solar Faculae, Solar Magnetic Field, Solar Patrol, Solar Physics, Sun, Sunspots, Time Series, Time Series Analysis, Time Span},
	pages = {61--66},
}

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