def update_smag_metadata(col_name):
    """Update SuperMAG metadata

    Parameters
    -----------
    col_name : (str)
        Data column name

    Returns
    --------
    col_dict : (dict)
       Dictionary of strings detailing the units and long-form name of the data

    """

    smag_units = {'IAGA': 'none', 'N': 'nT', 'E': 'nT', 'Z': 'nT',
                  'MLT': 'hours', 'MLAT': 'degrees', 'SZA': 'degrees',
                  'IGRF_DECL': 'degrees', 'SMU': 'none', 'SML': 'none',
                  'datetime': 'YYYY-MM-DD HH:MM:SS',
                  'GEOLON': 'degrees', 'GEOLAT': 'degrees',
                  'AACGMLON': 'degrees', 'AACGMLAT': 'degrees',
                  'STATION_NAME': 'none',
                  'OPERATOR_NUM': 'none', 'OPERATORS': 'none'}
    smag_name = {'IAGA': 'Station Code',
                 'N': 'B along local magnetic North',
                 'E': 'B along local magnetic East',
                 'Z': 'B vertically downward',
                 'MLT': 'Magnetic Local Time',
                 'MLAT': 'Magnetic Latitude',
                 'SZA': 'Solar Zenith Angle',
                 'IGRF_DECL': 'IGRF magnetic declination',
                 'SMU': ' '.join(['Maximum eastward auroral electrojets',
                                  'strength.\nUpper envelope of N-component',
                                  'for stations between 40 and 80 degrees'
                                  'magnetic north.']),
                 'SML': ' '.join(['Maximum westward auroral electrojets',
                                  'strength.\nLower envelope of N-component',
                                  'for stations between 40 and 80 degrees',
                                  'magnetic north.']),
                 'datetime': 'UT date and time',
                 'GEOLON': 'geographic longitude',
                 'GEOLAT': 'geographic latitude',
                 'AACGMLON': ' '.join(['Altitude-Adjusted Corrected',
                                       'Geomagnetic longitude']),
                 'AACGMLAT': ' '.join(['Altitude-Adjusted Corrected',
                                       'Geomagnetic latitude']),
                 'STATION_NAME': 'Long form station name',
                 'OPERATOR_NUM': 'Number of station operators',
                 'OPERATORS': 'Station operator name(s)', }

    ackn = "When using this data please include the following reference:\n"
    ackn += "Gjerloev, J. W., The SuperMAG data processing technique, "
    ackn += "Geophys. Res., 117, A09213, doi:10.1029/2012JA017683, 2012\n\n"
    ackn += "For publications and presentations, please include the following"
    ackn += "acknowledgement:\nFor the ground magnetometer data we gratefully "
    ackn += "acknowledge: Intermagnet; USGS, Jeffrey J. Love; CARISMA, PI Ian "
    ackn += "Mann; CANMOS; The S-RAMP Database, PI K. Yumoto and Dr. K. "
    ackn += "Shiokawa; The SPIDR database; AARI, PI Oleg Troshichev; The "
    ackn += "MACCS program, PI M. Engebretson, Geomagnetism Unit of the "
    ackn += "Geological Survey of Canada; GIMA; MEASURE, UCLA IGPP and Florida"
    ackn += " Institute of Technology; SAMBA, PI Eftyhia Zesta; 210 Chain, PI "
    ackn += "K. Yumoto; SAMNET, PI Farideh Honary; The institutes who maintain"
    ackn += " the IMAGE magnetometer array, PI Eija Tanskanen; PENGUIN; "
    ackn += "AUTUMN, PI Martin Connors; DTU Space, PI Dr. Rico Behlke; South "
    ackn += "Pole and McMurdo Magnetometer, PI's Louis J. Lanzarotti and Alan "
    ackn += "T. Weatherwax; ICESTAR; RAPIDMAG; PENGUIn; British Artarctic "
    ackn += "Survey; McMac, PI Dr. Peter Chi; BGS, PI Dr. Susan Macmillan; "
    ackn += "Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio "
    ackn += "Wave Propagation (IZMIRAN); GFZ, PI Dr. Juergen Matzka; MFGI, PI "
    ackn += "B. Heilig; IGFPAS, PI J. Reda; University of L’Aquila, PI M. "
    ackn += "Vellante; BCMT, V. Lesur and A. Chambodut; Data obtained in "
    ackn += "cooperation with Geoscience Australia, PI Marina Costelloe; "
    ackn += "SuperMAG, PI Jesper W. Gjerloev."

    col_dict = {'units': smag_units[col_name],
                'long_name': smag_name[col_name],
                'acknowledgements': ackn}

    return col_dict