MetFns (version 1.0)

filter.F: Selection of visual meteor data by correction factor for clouds

Description

Selects data for a given visual meteor rate dataset and specified correction factor or interval of correction factors for clouds.

Usage

filter.F(data, F.low = 1, F.up = 3)

Arguments

data

data frame consisting of visual meteor rate data.

F.low

numeric vector with value between 1 (default) and 3, specifying lower boundary of correction factor for clouds.

F.up

numeric vector with value between 1 and 3 (default), specifying upper boundary of correction factor for clouds.

Value

• filter.F returns data frame with the same number of columns as the argument data, containing observations with the correction factors for clouds between F.low and F.up.

Details

Correction factor for clouds is calculated by the formula F=1/(1-p), where p is a fraction (0) of clouds covering observing field of view.

References

http://www.imo.net/data/visual Rendtel J. and Arlt R., editors (2008). IMO Handbook For Meteor Observers. IMO, Potsdam.

See Also

filter,filter.totcor

Examples

## select visual meteor data for the period between 15-30th October 2005 and 
## correction factor for clouds below 1.25 (which corresponds to 20% of clouds)

## rate data for the year 2005
data(rate05)
rateOct<-filter.date(rate05,year=2005,month=10,day.beg=15,day.end=30)
filter.F(rateOct,F.up=1.25)