Joy's Law

Joy's Law may refer to two separate concepts.

In astronomy, Joy's Law describes sunspots and states that active sunspot regions tend to be "tilted" with the leading spot closer to the equator than the following spots.cite journal |title= [http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1919ApJ....49..153H The magnetic polarity of sun-spots] |author= Hale GE, Ellerman F, Nicholson SB, Joy AH |journal=Astrophysical Journal |volume=49 |pages=153 |year=1919 |doi=10.1086/142452] 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 |year=1992 |id=1992ASPC...27..168D] cite journal |title= [http://www.aanda.org/index.php?option=com_base_ora&url=articles/aa/full/2001/28/aa10281/aa10281.right.html&access=standard&Itemid=81#Hale19 Relationship in sign between tilt and twist in active region magnetic fields] |author=Tian L, Bao S, Zhang H, Wang H |journal=A&A |volume=374 |pages=294–300 |year=2001 |doi=10.1051/0004-6361:20010701] It is named after A. H. Joy.

In management, it refers to the principle that "No matter who you are, most of the smartest people work for someone else,” attributed to Sun Microsystems co-founder Bill Joy.cite book |author=Lakhani KR, Panetta JA |title=The Principles of Distributed Innovation |volume=2 |publisher=MIT Press |url=http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1021034 |year=2007]

References

External links

* [http://eo.nso.edu/dasl/Lessons/Joy/index.htm Data and Activities for Solar Learning - Illustrating Joy's Law] (accessed 2007-03-30).
* [http://solarscience.msfc.nasa.gov/images/joys_law.jpgImage illustrating Joy's Law]
* [http://solarscience.msfc.nasa.gov/dynamo.shtml The Solar Dynamo] — background information.