<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 12:10:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="18.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="2 2 0 0 0 0 0 0 0 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, F2 cusps do not match</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.02.28 (059) 12:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202605902281210009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="11.100" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.867" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.823" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.100" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="210.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="210.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="110.000" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="20.000" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="436.667" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.044" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.100" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.196" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="313.016" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="238.945" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.086" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="96.465" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="36.238" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="53.277" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="127.420" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.180" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="141">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
4.1 4.15 4.2 4.25 4.3 4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
210.000 210.000 213.333 216.667 220.000 223.333 226.667 230.000 240.000 240.000 240.000 245.000 245.000 245.000 250.000 250.000 250.000 252.500 255.000 256.875 258.750 260.625 262.500 264.375 266.250 268.125 270.000 275.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 285.000 285.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 317.500 320.000 320.000 320.000 320.000 325.000 325.000 325.000 327.500 330.000 332.500 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 365.000 365.000 365.000 365.000 370.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 410.000 415.000 417.500 420.000 420.000 425.000 425.000 425.000 425.000 425.000 425.000 430.000 430.000 433.333 436.667 440.000 445.000 455.017 475.490 540.660
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 0 0 51 0 0 51 51 57 54 51 57 54 57 0 57 0 60 0 0 54 0 0 51 0 60 0 0 0 0 0 0 57 51 63 63 60 60 63 60 57 57 60 60 63 60 60 60 63 63 60 57 63 63 63 63 60 63 66 66 66 66 69 69 0 60 63 66 63 60 60 63 0 0 0 54 0 60 63 54 54 60 60 60 60 63 60 63 63 63 66 57 63 54 60 63 66 60 48 54 45 54 57 57 54 42 51 57 60 60 57 60 51 0 60 57 57 57 54 54 57 51 0 48 51 48 54 48 51 51 48 48 45 0 0 45 45 0 48 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -1.953125 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.953125 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.538 90.0 95.0 100.0 105.0 110.0 113.022 115.0 116.044 119.066 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 313.016 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.046 2.635 2.945 3.044 2.922 2.922 2.922 3.044 3.074 3.233 3.39 3.548 3.709 3.873 4.041 4.214 4.393 4.578 4.769 4.965 5.168 5.376 5.589 5.806 6.028 6.254 6.483 6.714 6.948 7.184 7.421 7.66 7.9 8.141 8.383 8.626 8.87 9.116 9.362 9.609 9.856 10.102 10.344 10.578 10.793 10.97 11.08 11.1 11.099 11.082 11.048 10.997 10.932 10.852 10.759 10.655 10.54 10.415 10.281 10.14 9.991 9.837 9.678 9.514 9.346 9.175 9.002 8.827 8.65 8.473 8.295 8.117 7.94 7.763 7.587 7.413 7.24 7.069 6.899 6.732 6.567 6.404 6.244 6.087 5.932 5.78 5.631 5.485 5.341 5.201 5.063 4.928 4.797 4.668 4.542 4.419 4.299 4.181 4.067 3.955 3.846 3.74 3.637 3.536 3.437 3.341 3.248 3.157 3.068 2.982 2.898 2.817 2.737 2.66 2.584 2.511 2.44 2.371 2.303 2.238 2.174 2.112 2.052 1.993 1.936 1.881 1.827 1.775 1.724 1.675 1.627 1.58 1.535 1.49 1.448 1.406 1.366 1.326 1.288 1.251 1.215 1.18 1.146 1.113 1.081 1.05 1.02 0.99 0.962 0.934 0.907 0.881 0.856 0.831 0.807 0.784 0.761 0.739 0.718 0.697 0.677 0.657 0.638 0.62 0.602 0.585 0.568 0.551 0.536 0.52 0.505 0.49 0.476 0.463 0.449 0.436 0.424 0.411 0.399 0.388 0.377 0.366 0.355 0.345 0.335 0.325

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.044" PeakHeight="110.0" Num="3" Error="0.0">
-30.232 12.756 -2.986
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.044" EndFrequency="11.1" PeakHeight="313.016" Num="5" zHalfNm="238.945" Error="2.995">
-153.566 -51.725 14.614 -4.757 1.484
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.066" Depth="0.122"/>
<TopsideChapman PeakHeight="313.016" PeakDensity="1528660.0" PeakScaleHeight="53.277" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
