View source for Astronomy:Joy's Law

In [[Astronomy:Astronomy|astronomy]], '''Joy's Law''' describes sunspots and states that their tendency to be "tilted" (with the leading spot closer to the equator than the following spots) grows with the heliographic latitude of these regions.<ref name=Hale1919>{{cite journal |title=The magnetic polarity of sun-spots |vauthors=Hale GE, Ellerman F, Nicholson SB, Joy AH |journal=Astrophysical Journal |volume=49 |pages=153 |date=1919 |doi=10.1086/142452 |bibcode=1919ApJ....49..153H}}</ref><ref>{{cite journal |title=Average properties of bipolar magnetic regions during sunspot cycle 21|author1=Wang, Y.-M. |author2=Sheeley, N. R., Jr. |journal=Solar Physics|volume=124 |pages=81–100|date=1989 |doi=10.1007/BF00146521|bibcode=1989SoPh..124...81W}}</ref><ref name=DSilva1992>{{cite journal |author=D'Silva S |title=Joy's Law and limits on the magnetic field strength at the bottom of the convection zone. |journal=The solar cycle; Proceedings of the National Solar Observatory/Sacramento Peak 12th Summer Workshop, ASP Conference Series (ASP: San Francisco) |volume=27 |pages=168 |date=1992 |id=1992ASPC...27..168D}}</ref><ref name=Tian2001>{{cite journal |title=Relationship in sign between tilt and twist in active region magnetic fields] |vauthors=Tian L, Bao S, Zhang H, Wang H |journal=Astronomy and Astrophysics |volume=374 |issue=1 |pages=294–300 |date=2001 |doi=10.1051/0004-6361:20010701|bibcode = 2001A&A...374..294T |doi-access=free }}</ref>  Joy's Law provides observational support for the operation of the "alpha effect" in [[Astronomy:Solar dynamo|solar dynamo]] action.<ref>{{Cite web|title = NASA/Marshall Solar Physics|url = http://solarscience.msfc.nasa.gov/dynamo.shtml|website = solarscience.msfc.nasa.gov|accessdate = 2015-12-10}}</ref> It is named after Alfred Harrison Joy.
==References==
{{reflist}}

[[Category:Solar phenomena]]



{{Sourceattribution|Joy's Law (astronomy)|1}}