## Project description

This package allows for bulk downloads of spectrograms for a given set of days in a given month and year, for a list of given instruments (visit link for a list of all instruments from which the data is sourced).

The downloads are structured within a e-Callisto directory inside the working directory. The same is illustrated below:

working directory/
└───e-Callisto/
└───yyyy/
└───mm/
└───dd/
└───file1..
file2..


## Functions of this package:

• which_years()
Prints all those years for which any spectrograms are available

• which_months(select_year)
Prints all those months of a given year for which spectrograms are available

• which_days(select_year, select_month)
Prints all those days of a given year and month for which spectrograms are available

• instrument_codes()
Prints instructions for choosing instruments parameter in download()

• download(select_year, select_month, select_day, instruments)
Downloads the spectrograms for given list of days of a given year and month; for set of instruments

## Argument rules:

• select_year
must be a valid 4-digit integer

• select_month
must be a valid integer

• select_day
could either be a valid integer or a list of valid integers

• instruments
could be either a single instrument code[^1] or a wildcard string ending with an asterisk indicating to download all the files which start with the wildcard string.

[^1]: Instrument codes is a list of codes derived specifically for this package and each code corresponds to one of the instrument-location combination from link. The text before the first hyphen in a file name is the instrument code.

Understanding the instruments parameter:

See link and if you would want to download all files from Mauritius, then the argument for instruments would be 'MRT*' but if you would want to download only the data from Callisto intensity 45 MHz-870 MHz of Poste de Flacq, Mauritius, LPDA, then that argument would be 'MRT1'.

If the instruments argument of the download() function ends with an asterisk, all the files from a given date which start with the argument are downloaded.

## Project details

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