<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 13:50:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: One of F2 cusps was derived from the other</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) 13:50:00</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">
FF202605902281350009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="10.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.551" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.402" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" 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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="520.000" 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="3.337" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.336" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="346.872" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="242.743" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.220" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="129.302" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="42.509" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="72.531" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="180.890" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.120" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="100">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 285.000 285.000 285.000 290.000 295.000 300.000 305.000 306.667 308.333 310.000 315.000 320.000 321.667 323.333 325.000 325.000 327.500 330.000 335.000 335.000 340.000 340.000 340.000 345.000 345.000 345.000 346.667 348.333 350.000 350.000 355.000 357.500 360.000 362.500 365.000 365.000 365.000 365.000 365.000 368.000 371.000 374.000 377.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 400.000 400.000 405.000 405.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 430.000 435.000 435.000 440.000 440.000 445.000 445.000 450.000 455.000 460.000 460.000 465.000 465.000 470.000 475.000 480.000 480.000 480.000 485.000 490.000 490.000 495.000 495.000 495.000 500.000 505.000 510.000 510.000 510.000 515.000 520.000 520.000 525.000 530.000 535.000 542.236 551.492 563.750
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 54 51 54 0 0 45 0 0 48 45 45 0 0 51 48 0 51 51 54 48 54 54 54 57 57 0 0 57 54 57 0 0 0 0 0 57 57 54 0 57 0 0 57 60 57 60 57 60 57 51 57 48 57 63 60 54 63 54 57 57 51 48 57 57 60 60 60 60 57 51 60 57 57 60 57 48 57 60 57 51 57 51 57 57 57 51 45 51 54 54 51 48 51 51 51 48 0 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 0.390625 -1.953125 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -2.734375 -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 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 -1.953125 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" >
89.491 90.0 95.0 100.0 105.0 110.0 111.769 113.537 115.0 115.306 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 346.872 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.245 2.888 3.228 3.337 3.214 3.214 3.316 3.337 3.515 3.681 3.836 3.987 4.134 4.281 4.429 4.577 4.727 4.878 5.03 5.184 5.339 5.496 5.654 5.812 5.97 6.129 6.288 6.447 6.605 6.763 6.92 7.077 7.233 7.389 7.544 7.698 7.852 8.006 8.16 8.313 8.467 8.62 8.775 8.929 9.085 9.241 9.397 9.555 9.712 9.869 10.021 10.162 10.278 10.344 10.35 10.348 10.338 10.318 10.29 10.254 10.211 10.16 10.102 10.038 9.968 9.892 9.811 9.726 9.636 9.542 9.444 9.342 9.238 9.131 9.021 8.909 8.795 8.679 8.562 8.444 8.324 8.204 8.083 7.962 7.84 7.718 7.597 7.475 7.353 7.233 7.112 6.992 6.873 6.755 6.637 6.521 6.405 6.29 6.177 6.065 5.954 5.844 5.736 5.629 5.523 5.419 5.316 5.215 5.115 5.016 4.919 4.824 4.73 4.637 4.546 4.456 4.368 4.281 4.196 4.112 4.03 3.949 3.869 3.791 3.714 3.639 3.565 3.492 3.421 3.351 3.282 3.215 3.149 3.084 3.021 2.958 2.897 2.837 2.778 2.721 2.664 2.609 2.554 2.501 2.449 2.398 2.348 2.299 2.251 2.203 2.157 2.112 2.068 2.024 1.982 1.94 1.899 1.859 1.82 1.782 1.744 1.707 1.671 1.636 1.601 1.568 1.535 1.502 1.47 1.439 1.409 1.379 1.35 1.321 1.293 1.266 1.239 1.213 1.187 1.162 1.137 1.113 1.089 1.066 1.044 1.021

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.337" PeakHeight="110.0" Num="3" Error="0.0">
-30.463 13.095 -3.141
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.337" EndFrequency="10.35" PeakHeight="346.872" Num="5" zHalfNm="242.743" Error="3.373">
-187.491 -65.801 26.969 -7.827 2.584
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.306" Depth="0.123"/>
<TopsideChapman PeakHeight="346.872" PeakDensity="1329063.2" PeakScaleHeight="72.531" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
