netcdf ICON_MIGHTI-A_RED_L2PARAM_2016-12-02_15.45.47 {
variables:
	double ICON_MIGHTI_Wavenumber ;
		ICON_MIGHTI_Wavenumber:CatDesc = "The wavenumber (1/wavelength) of the emission" ;
		ICON_MIGHTI_Wavenumber:Units = "m^-1" ;
		ICON_MIGHTI_Wavenumber:Var_Notes = "" ;
	double ICON_MIGHTI_Zero_Wind_Phase ;
		ICON_MIGHTI_Zero_Wind_Phase:CatDesc = "The measured, unwrapped phase corresponding to zero wind" ;
		ICON_MIGHTI_Zero_Wind_Phase:Units = "rad" ;
		ICON_MIGHTI_Zero_Wind_Phase:Var_Notes = "After inverting the interferogram, unwrapping, and averaging, we are left with a single phase for each altitude, but this phase is only meaningful as a relative quantity; the absolute phase corresponding to zero wind must be subtracted to yield an absolute wind. This phase is found by conducting a \"zero wind\" spacecraft maneuver. By viewing the same region of the atmosphere in the ram and the wake, separated by ~10 minutes, we can determine the zero phase since these two phase measurements should be equal and opposite." ;
	double ICON_MIGHTI_Phase_Offset ;
		ICON_MIGHTI_Phase_Offset:CatDesc = "A phase that is added before unwrapping to avoid 2pi discontinuities" ;
		ICON_MIGHTI_Phase_Offset:Units = "rad" ;
		ICON_MIGHTI_Phase_Offset:Var_Notes = "A phase to subtract from the interferogram before unwrapping to avoid 2pi discontinuities within a single wind profile, and also from profile to profile. It is added after unwrapping so that the zero wind phase is unaffected." ;
	int ICON_MIGHTI_Bin_Size ;
		ICON_MIGHTI_Bin_Size:CatDesc = "Number of raw samples binned vertically for each reported sample" ;
		ICON_MIGHTI_Bin_Size:Units = "" ;
		ICON_MIGHTI_Bin_Size:Var_Notes = "A higher number sacrifices resolution to improve precision" ;
	byte ICON_MIGHTI_Integration_Order ;
		ICON_MIGHTI_Integration_Order:CatDesc = "Order used to discretize the integral for inversion: 0=Riemann, 1=Trapezoidal" ;
		ICON_MIGHTI_Integration_Order:Units = "" ;
		ICON_MIGHTI_Integration_Order:Var_Notes = "0 is recommended. Choosing 1 sacrifices precision to improve accuracy, which may be useful when the wind shear is large and the signal is bright." ;
	string ICON_MIGHTI_Top_Layer ;
		ICON_MIGHTI_Top_Layer:CatDesc = "How the top altitudinal layer is handled in the inversion: exp or thin" ;
		ICON_MIGHTI_Top_Layer:Units = "" ;
		ICON_MIGHTI_Top_Layer:Var_Notes = "Some assumption must be made regarding the behavior of the atmosphere above the top layer observed by MIGHTI (300 km). Because of increasing viscosity, we assume the winds are constant. The standard assumption is that the emission goes to zero above the top observed layer (i.e., the top layer is \"thin\"). A more realistic choice is to assume the emission falls off exponentially (\"exp\") with height. We assume a scale height of 26 km, which was extracted from various airglow models." ;
	double ICON_MIGHTI_Spherical_Asymmetry_Threshold ;
		ICON_MIGHTI_Spherical_Asymmetry_Threshold:CatDesc = "Threshold on relative difference in A&B emission rate, for spherical asymmetry flag in L2.2" ;
		ICON_MIGHTI_Spherical_Asymmetry_Threshold:Units = "" ;
		ICON_MIGHTI_Spherical_Asymmetry_Threshold:Var_Notes = "Relative difference in emission rate measured by A and B, beyond which the spherical-asymmetry flag will be raised. Technically, it should be \"fringe amplitude\" instead of \"emission rate\" due to the temperaturedependence. Relative difference is defined as abs(A-B)/((A+B)/2)." ;

// global attributes:
		:Acknowledgement = "This is a parameter file for the NASA Ionospheric Connection Explorer mission, an Explorer launched in June 2017.\n\nThis file specifies parameters for the Level 2 processing of MIGHTI data. This file is not intended for public use. Please see the website (http://icon.ssl.berkeley.edu) or contact Dr. Thomas Immel at UC Berkeley." ;
		:ADID_Ref = "NASA Contract > NNG12FA45C" ;
		:Description = "ICON MIGHTI-A Level 2 Parameter File for Red" ;
		:Generation_Date = "20161202" ;
		:History = "bhardin2, 2016-12-02T15:45:47, " ;
		:HTTP_LINK = "http://icon.ssl.berkeley.edu/Instruments/MIGHTI" ;
		:Instrument = "MIGHTI-A" ;
		:Parents = "" ;
		:PI_Affiliation = "UC Berkeley > SSL" ;
		:PI_Name = "T. J. Immel" ;
		:Project = "NASA > ICON" ;
		:Spacecraft_ID = "NASA > ICON - 493" ;
		:Text = "ICON explores the boundary between Earth and space - the ionosphere - to understand the physical connection between our world and the immediate space environment around us. Visit \'http://icon.ssl.berkeley.edu\' for more details." ;
		:Text_Supplement = "((TODO: Insert reference to Harding et al [2016] paper))" ;
data:

 ICON_MIGHTI_Wavenumber = 1587224.99739695 ;

 ICON_MIGHTI_Zero_Wind_Phase = 128.648464318 ;

 ICON_MIGHTI_Phase_Offset = -1.139683 ;

 ICON_MIGHTI_Bin_Size = 1 ;

 ICON_MIGHTI_Integration_Order = 0 ;

 ICON_MIGHTI_Top_Layer = "exp" ;

 ICON_MIGHTI_Spherical_Asymmetry_Threshold = 0.19 ;
}