Author: Krzysztof Markowicz, e-mail kmark@igf.fuw.edu.pl
Date: Last modified, Dec 2025

Device: 
Aurora 4000 Nephelometer connected to ASC1000 (with controled relative humidity)
Instrument to measure aerosol scattering cofficient at 450, 525, 635 nm for different scattering angles
All data saved in UTC time

Structure of files:
Lev 1.0 raw data includes ASCII files:
Daily files without header. The data includes following columns:
year, month,day,hour,minute,sec, scat635,scat525, scat450 (for angle 0 deg), scat635,scat525, scat450 (for angle 10deg),...to 90deg, air_temp, temp_cell, relative humidity, pressure, data sttus
(see Aurora 4000 manual for more details)

Lev 1.5 matlab file.
Data from this level includes corrected optical properties.
(see processlev15neph.m file for mode details)

Data includes data structure with following fields:
 year: year
 month: month
 day: day
 time: time [UTC]
 doy: day of year
 timeMATLAB: matlab format (number of days since Jan 1 of 0)
 lambda: wavelength
 scat: total aerosol scattering coeff [Mm^-1]
 angs: Scattering Angstrom exponent
 scat450: scayyering coefficient for all scattering angles at 450 nm
 scat525: scayyering coefficient for all scattering angles at 525 nm
 scat635: scayyering coefficient for all scattering angles at 635 nm
 Temp: temperature
 p: pressure [hPa]
 RH: relative humidity [%]

Lev 2.0 the same structure as the Lev 1.5 data.