View source for Astronomy:Population index

{{Short description|Meteor shower parameter}}
The '''population index''', or r-value, indicates the [[Astronomy:Apparent magnitude|magnitude]] distribution of a [[Astronomy:Meteor shower|meteor shower]]. Values below 2.5 correspond to distributions where bright meteors are more frequent than average, while values above 3.0 mean that the share of faint meteors is larger than usual.<ref>{{cite thesis |last=Molau |first=Sirko |date=2015 |title=Population index reloaded |url=https://articles.adsabs.harvard.edu/pdf/2015pimo.conf...11M |chapter=Introduction |publisher=Harvard University |access-date=11 July 2023}}</ref> Population indices are not solely associated with meteor showers.

==References==
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{{Meteor showers|state=collapsed}}

[[Category:Meteor showers]]
[[Category:Units of measurement in astronomy]]


{{Sourceattribution|Population index}}