def get_reflectivity_name(radar):
    """
    Test for several possible name for the ground radar reflectivity.

    Parameters:
    ===========
    radar: object
        Py-ART radar structure

    Returns:
    key: str
        Reflectivity field name.
    """
    possible_name = ['reflectivity', 'corrected_reflectivity', 'total_power',
                     'DBZ', 'DBZH', 'UZ', 'CZ', 'Refl']
    for key in possible_name:
        try:
            radar.fields[key]
            return key
        except KeyError:
            continue

    return None