University of North Dakota Department of Atmospheric Sciences Box 9006, University Station Grand Forks, ND, 58202-9006 vox = (701) 777-2184 fax = (701) 777-2940 The data contained in the following file is 1/5 hertz data from the UND Citation II Weather Research Aircraft. Each record has one value of one hundred and thirteen variables. The record size is 456 bytes. Each value in the record is stored in 32 bit integer format. All data items, excluding the date, have been converted to integer using the formula: Integer = 1000.0*(100.0 + FloatingPoint) To convert back to floating point use the formula: FloatingPoint = Integer/1000.0 - 100.0 The format for the date is decimal integer of the form: yymmdd. date = 10000*year + 100*month + day The data order is: Number Variable Units 1 Date yymmdd 2 True Air Speed meters/sec 3 INS Ground Speed meters/sec 4 INS Wind velocity meters/second 5 Calculated Wind velocity meters/second 6 INS Wind direction degrees 7 Calculated Wind direction degrees 8 INS True heading degrees 9 Magnetic heading degrees 10 Drift angle degrees 11 Pitch angle degrees 12 Roll angle degrees 13 Static pressure millibars 14 INS Altitude meters 15 Pressure Altitude meters 16 Vertical acceleration meters/second/second 17 Air temperature, Rosemount celcius 18 Air temperature, Reverse Flow celcius 19 Dew Point celcius 20 Attack millibars 21 SideSlip millibars 22 J. W. Liquid Water grams/cubic-meter 23 Pitotpressure, Nose millibars 24 Pitotpressure, Wing millibars 25 Ice detector volts 26 Ice detector Liquid WAter grams/cubic-meter 27 Angle of attack degrees 28 INS Latitude degrees 29 INS Longitude degrees 30 Vertical velocity meters/second 31 Vertical wind meters/second 32 Angle of sideslip degrees 33 Vapor Pressure millibars 34 Mixing Ratio grams/kilogram 35 Temperature, Reverse Flow (uncorrected) celcius 36 Equivalent Potential Temperature kelvin 37 Potential Temperature kelvin 38 Virtual Potential Temperature kelvin 39 Total Mixing Ratio grams/kilogram 40 Wet Equivalent Potential Temperature kelvin 41 Vertical Wind Angle degrees 42 VOR degrees 43 DME Nautical Miles 44 Heater Flag Volts 45 Engine RPM Per Cent 46 INS Track Angle degrees 47 Mach Number 48 Time Seconds from midnight 49 Cabin Altitude meters 50 Virtual Temperature kelvin 51 Ozone ppbv 52 Film Speed number 53 Frame Count meters 54 Event Marker Volts 55 NO2 ppbv 56 Condensation Nuclei number/ml 57 Relative Humidity Per Cent 58 Condensation Nuclei Temperature celcius 59 GPS Time Seconds from midnight 60 GPS Latitude degrees 61 GPS Longitude degrees 62 GPS Altitude meters 63 GPS Velocity North meters/second 64 GPS Velocity East meters/second 65 GPS Ground Speed meters/second 66 GPS Track Angle degrees 67 Condensation Nuclei Flow Rate liters/minute 68 FSSP Counts number 69 FSSP Concentration number/ml 70 FSSP Liquid Water grams/cubic-meter 71 FSSP Mean Diameter microns 72 FSSP Mean Volume Diameter microns 73 FSSP Median Diameter microns 74 FSSP Median Volume Diameter microns 75 FSSP Mode microns 76 FSSP Skew microns 77 FSSP Standard Deviation, Mean Diameter microns 78 FSSP Standard Deviation, Mean Vol. Diam.microns 79 OneDC Counts number 80 OneDC Concentration number/liter 81 OneDC Mass grams/cubic-meter 82 OneDC Mean Diameter microns 83 OneDC Mean Volume Diameter microns 84 OneDC Median Diameter microns 85 OneDC Median Volume Diameter microns 86 OneDC Mode microns 87 OneDC Standard Deviation, Mean Diameter microns 88 OneDC Standard Dev., Mean Vol. Diam. microns 89 OneDP Counts number 90 OneDP Concentration number/liter 91 OneDP Mass grams/cubic-meter 92 OneDP Mean Diameter microns 93 OneDP Mean Volume Diameter microns 94 OneDP Median Diameter microns 95 OneDP Median Volume Diameter microns 96 OneDP Mode microns 97 OneDP Standard Deviation, Mean Diameter microns 98 OneDP Standard Dev., Mean Vol. Diam. microns 99 TwoDC Counts number 100 TwoDC Concentration number/liter 101 TwoDC Mass grams/cubic-meter 102 TwoDC Mean Diameter microns 103 TwoDC Mean Volume Diameter microns 104 TwoDC Median Diameter microns 105 TwoDC Median Volume Diameter microns 106 TwoDC Mode microns 107 TwoDC Standard Deviation, Mean Diameter microns 108 TwoDC Standard Dev., Mean Vol. Diam. microns 109 TwoDC Shadow-Or number/liter 110 OneDC Skew microns 111 OneDP Skew microns 112 TwoDC Skew microns 113 Corrected Latitude degrees 114 Corrected Longitude degrees 115 116 117 118 119