<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 18:30:00.000"
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: 100%</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" >
2026.04.01 (091) 18:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609104011830009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="12.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.481" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.395" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="245.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="245.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="515.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.891" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="388.735" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="293.337" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.729" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="128.140" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="57.637" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="69.714" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="166.490" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.170" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="161">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
245.000 250.000 250.000 250.000 253.333 256.667 260.000 261.667 263.333 265.000 265.000 270.000 275.000 275.000 277.500 280.000 282.500 285.000 285.000 287.500 290.000 292.500 295.000 297.500 300.000 305.000 307.500 310.000 310.000 315.000 315.000 320.000 320.000 320.000 325.000 325.000 327.500 330.000 335.000 335.000 340.000 340.000 345.000 345.000 345.000 350.000 351.667 353.333 355.000 355.000 360.000 360.000 365.000 365.000 365.000 365.000 370.000 370.000 372.500 375.000 375.000 375.000 380.000 380.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 392.500 395.000 397.500 400.000 402.500 405.000 405.000 405.000 407.500 410.000 412.500 415.000 415.000 420.000 420.000 420.000 422.500 425.000 425.000 430.000 430.000 430.000 430.000 433.333 436.667 440.000 440.000 440.000 440.000 440.000 445.000 445.000 445.000 445.000 445.000 450.000 450.000 450.000 450.000 455.000 455.000 455.000 455.000 460.000 460.000 460.000 462.500 465.000 465.000 466.429 467.857 469.286 470.714 472.143 473.571 475.000 480.000 480.000 480.000 485.000 486.667 488.333 490.000 490.000 490.000 490.000 500.000 502.500 505.000 508.333 511.667 515.000 515.000 515.000 520.000 530.000 532.483 535.244 538.335 541.816 545.768 550.293 555.526 561.645 568.897 577.630 588.349 601.816 619.246
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 54 48 0 0 51 0 0 54 51 0 45 48 0 48 0 45 0 0 45 0 0 0 54 51 0 51 57 54 60 54 60 60 60 60 0 60 57 57 51 54 45 0 54 54 0 0 51 54 51 57 45 57 0 63 54 60 51 57 60 60 51 57 48 57 63 66 66 63 63 63 0 0 0 0 0 54 63 66 0 66 54 60 63 57 60 66 60 66 69 60 66 69 63 0 0 60 63 0 63 57 57 60 60 57 54 57 60 60 57 57 60 60 60 60 0 60 0 57 57 0 0 0 0 0 0 57 45 0 54 48 0 0 51 54 0 0 48 42 48 0 0 45 48 48 48 42 0 51 48 0 0 57 57 0 51 54 54 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 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 2.734375 -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 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 2.734375 -0.390625 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 -0.390625 -0.390625 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 1.953125
</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" >
89.565 90.0 95.0 100.0 105.0 110.0 113.71 115.0 117.421 120.0 121.131 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 388.735 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.235 1.943 2.503 2.797 2.891 2.769 2.769 2.769 2.854 2.891 2.986 3.113 3.243 3.378 3.516 3.657 3.801 3.949 4.099 4.252 4.407 4.565 4.725 4.887 5.051 5.217 5.385 5.554 5.726 5.899 6.074 6.251 6.43 6.611 6.793 6.978 7.164 7.353 7.543 7.735 7.93 8.126 8.325 8.527 8.73 8.936 9.144 9.354 9.567 9.782 9.999 10.218 10.438 10.658 10.879 11.097 11.312 11.52 11.717 11.896 12.049 12.165 12.234 12.25 12.25 12.241 12.22 12.188 12.146 12.094 12.032 11.962 11.884 11.798 11.704 11.604 11.498 11.387 11.27 11.148 11.023 10.893 10.76 10.623 10.485 10.343 10.2 10.055 9.908 9.76 9.612 9.462 9.313 9.163 9.013 8.863 8.713 8.564 8.416 8.268 8.122 7.976 7.832 7.688 7.546 7.406 7.267 7.129 6.993 6.859 6.726 6.595 6.466 6.339 6.213 6.089 5.967 5.848 5.729 5.613 5.499 5.387 5.276 5.167 5.061 4.956 4.853 4.752 4.652 4.555 4.459 4.365 4.273 4.183 4.094 4.007 3.922 3.838 3.756 3.676 3.597 3.52 3.444 3.37 3.297 3.226 3.157 3.088 3.021 2.956 2.892 2.829 2.767 2.707 2.648 2.591 2.534 2.479 2.425 2.372 2.32 2.269 2.219 2.171 2.123 2.077 2.031 1.987 1.943 1.9 1.859 1.818 1.778 1.739 1.7 1.663 1.626 1.591 1.555 1.521 1.488 1.455 1.423 1.391 1.361 1.331 1.301

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.891" PeakHeight="110.0" Num="3" Error="0.0">
-30.102 12.566 -2.899
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.891" EndFrequency="12.25" PeakHeight="388.735" Num="5" zHalfNm="293.337" Error="2.418">
-216.374 -67.778 20.397 -4.091 0.242
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="11.131" Depth="0.122"/>
<TopsideChapman PeakHeight="388.735" PeakDensity="1861817.6" PeakScaleHeight="69.714" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
