def filter_thermal_celsius(thermal, min_celsius=-9320, max_celsius=7070):
    """
    Provide an index of observations within a brightness temperature range.

    Thermal min/max must be provided as a scaled value in degrees celsius.

    The range in unscaled degrees celsius is (-93.2C,70.7C)
    The range in scaled degrees celsius is (-9320, 7070)

    Arguments:
        thermal: 1-d array of thermal values
        min_celsius: minimum temperature in degrees celsius
        max_celsius: maximum temperature in degrees celsius
        
    Returns:
        1-d bool ndarray
    """
    return ((thermal > min_celsius) &
            (thermal < max_celsius))