<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-18 -077 12:00:00.000"
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" >
2026.03.18 (077) 12:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607703181200009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.631" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.310" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.450" 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="0.600" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.021" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.184" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="336.127" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="242.531" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.179" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="119.814" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="36.141" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="66.139" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="153.930" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.270" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="125">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.8 3.85 3.9 3.95 4.0 4.05 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
215.000 210.000 215.000 216.250 217.500 218.750 220.000 220.000 220.000 225.000 230.000 230.000 235.000 240.000 245.000 255.000 255.000 260.000 265.000 270.000 275.000 280.000 285.000 285.000 290.000 290.000 295.000 295.000 295.000 295.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 322.000 324.000 326.000 328.000 330.000 330.000 330.000 335.000 337.500 340.000 335.000 338.333 341.667 345.000 345.000 345.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 435.000 440.000 440.000 445.000 445.000 450.000 455.000 460.000 460.000 465.000 465.000 470.000 475.000 475.000 480.000 485.000 490.000 490.000 500.000 500.000 505.000 511.325 518.775 527.679 538.510
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 48 0 0 0 48 57 51 0 57 51 51 48 48 48 51 0 51 51 51 54 54 57 60 60 60 63 60 57 48 54 57 57 60 60 57 60 63 63 63 63 63 66 66 63 60 54 63 60 57 0 0 60 0 60 60 60 60 0 51 60 0 0 57 60 63 57 63 51 0 63 57 63 54 63 69 60 63 57 63 60 63 60 57 63 60 66 63 69 69 66 69 66 69 63 66 66 60 63 60 54 63 60 63 63 60 54 63 60 57 54 57 57 57 57 54 54 54 48 48 54 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 -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 -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 -2.734375 -1.171875
</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" >
89.542 90.0 95.0 100.0 105.0 110.0 113.124 115.0 116.249 119.373 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 336.127 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.031 2.615 2.923 3.021 2.899 2.899 2.899 3.021 3.039 3.18 3.314 3.445 3.576 3.709 3.845 3.985 4.129 4.279 4.434 4.594 4.761 4.933 5.11 5.291 5.475 5.663 5.851 6.041 6.231 6.42 6.607 6.794 6.978 7.161 7.342 7.521 7.699 7.875 8.049 8.223 8.395 8.566 8.736 8.906 9.074 9.241 9.406 9.565 9.715 9.849 9.95 9.998 10.0 9.997 9.983 9.959 9.925 9.883 9.831 9.772 9.705 9.631 9.551 9.464 9.372 9.275 9.174 9.068 8.959 8.846 8.73 8.612 8.491 8.368 8.244 8.118 7.991 7.863 7.735 7.606 7.477 7.348 7.219 7.09 6.962 6.835 6.708 6.582 6.457 6.333 6.211 6.089 5.969 5.85 5.733 5.617 5.503 5.39 5.279 5.169 5.061 4.955 4.851 4.748 4.647 4.547 4.449 4.353 4.259 4.167 4.076 3.987 3.899 3.813 3.729 3.647 3.566 3.486 3.409 3.333 3.258 3.185 3.113 3.043 2.975 2.907 2.842 2.777 2.714 2.653 2.592 2.533 2.475 2.419 2.364 2.31 2.257 2.205 2.154 2.105 2.057 2.009 1.963 1.918 1.874 1.831 1.788 1.747 1.707 1.667 1.629 1.591 1.554 1.518 1.483 1.449 1.415 1.382 1.35 1.319 1.288 1.258 1.229 1.201 1.173 1.146 1.119 1.093 1.068 1.043 1.018 0.995 0.972 0.949 0.927 0.905 0.884 0.864 0.844 0.824 0.805 0.786 0.768 0.75 0.732 0.715

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.021" PeakHeight="110.0" Num="3" Error="0.0">
-30.213 12.728 -2.973
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.021" EndFrequency="10.0" PeakHeight="336.127" Num="5" zHalfNm="242.531" Error="6.258">
-176.113 -53.894 18.585 -8.316 2.984
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.373" Depth="0.122"/>
<TopsideChapman PeakHeight="336.127" PeakDensity="1240694.8" PeakScaleHeight="66.139" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
