<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-04 -094 16:30:00.000"
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="1 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: 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" >
2026.04.04 (094) 16:30:00</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">
FF202609404041630009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="11.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.471" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.032" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="6.600" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.400" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.460" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="345.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="345.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="115.566" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.000" Name="h`Es" 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="10.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="506.667" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.309" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.322" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="373.408" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="261.119" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.508" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.300" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="144.847" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="60.698" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="80.846" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="195.440" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.170" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="102">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
345.000 350.000 351.667 353.333 355.000 355.000 356.250 357.500 358.750 360.000 365.000 365.000 365.000 365.000 365.000 370.000 375.000 375.000 375.000 375.000 377.500 380.000 385.000 385.000 385.000 390.000 392.500 395.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 420.000 425.000 425.000 425.000 425.000 430.000 430.000 435.000 435.000 437.500 440.000 440.000 440.000 440.000 445.000 450.000 450.000 445.000 450.000 455.000 457.500 460.000 460.000 462.500 465.000 470.000 470.000 470.000 471.667 473.333 475.000 480.000 480.000 480.000 485.000 480.000 490.000 490.000 495.000 497.500 500.000 503.333 506.667 510.000 515.000 520.000 525.000 530.000 535.000 541.000 547.000 553.000 559.000 565.000 570.000 577.526 585.692 594.584 604.304 614.973 626.736
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 57 0 0 57 57 0 0 0 57 57 0 57 54 45 0 54 60 57 54 0 57 54 60 60 57 45 54 60 63 60 63 66 60 63 57 60 51 60 48 57 60 54 60 63 63 63 66 60 60 54 60 60 0 57 0 51 54 60 51 60 45 57 57 51 57 42 48 51 0 0 54 48 48 51 48 45 48 45 45 0 45 0 0 45 42 0 45 45 42 0 0 0 0 42 42 0 0 0 0 0 42
</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 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 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 0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 1.953125 -0.390625 -0.390625 0.390625 0.390625 2.734375 1.953125 -0.390625 0.390625 1.171875 0.390625 0.390625 -1.953125 -0.390625 0.390625 0.390625 1.171875 1.953125 -0.390625 2.734375 2.734375 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.4 3.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.566 119.320
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="47">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
125.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.625 116.250 116.875 117.500 118.125 118.750 119.375 120.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 0 51 54 0 0 54 54 0 54 0 57 57 51 0 57 57 57 57 57 0 0 0 63 66 63 66 66 66 66 0 0 69 69 66 0 0 0 0 0 0 0 0 0 0 45
</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 -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 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625
</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" >
89.473 90.0 95.0 100.0 105.0 110.0 111.886 113.771 115.0 115.657 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 373.408 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.241 2.328 2.994 3.347 3.46 3.332 3.332 3.415 3.46 3.638 3.834 4.021 4.202 4.378 4.551 4.72 4.887 5.052 5.215 5.377 5.538 5.698 5.858 6.017 6.176 6.335 6.493 6.652 6.811 6.971 7.131 7.291 7.453 7.614 7.777 7.941 8.106 8.271 8.438 8.606 8.775 8.946 9.117 9.29 9.465 9.64 9.816 9.994 10.172 10.35 10.527 10.703 10.877 11.046 11.207 11.359 11.494 11.607 11.692 11.74 11.75 11.75 11.743 11.727 11.704 11.673 11.635 11.589 11.538 11.48 11.416 11.346 11.272 11.192 11.108 11.019 10.927 10.831 10.731 10.628 10.523 10.414 10.304 10.191 10.076 9.96 9.842 9.722 9.602 9.48 9.358 9.235 9.112 8.988 8.864 8.74 8.616 8.492 8.368 8.245 8.122 8.0 7.878 7.757 7.636 7.517 7.398 7.281 7.164 7.048 6.934 6.82 6.708 6.596 6.486 6.378 6.27 6.164 6.059 5.955 5.853 5.752 5.652 5.554 5.457 5.361 5.267 5.174 5.082 4.992 4.903 4.815 4.729 4.644 4.561 4.478 4.397 4.318 4.239 4.162 4.086 4.011 3.938 3.866 3.795 3.725 3.656 3.589 3.522 3.457 3.393 3.33 3.268 3.208 3.148 3.089 3.032 2.975 2.919 2.865 2.811 2.758 2.707 2.656 2.606 2.557 2.509 2.462 2.415 2.37 2.325 2.281 2.238 2.196 2.154 2.114 2.074 2.034 1.996 1.958 1.921 1.885 1.849 1.814 1.779 1.746 1.712

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.46" PeakHeight="110.0" Num="3" Error="0.0">
-30.548 13.223 -3.202
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.46" EndFrequency="11.75" PeakHeight="373.408" Num="5" zHalfNm="261.119" Error="2.716">
-218.914 -60.735 24.646 -2.923 0.175
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.657" Depth="0.128"/>
<TopsideChapman PeakHeight="373.408" PeakDensity="1712934.2" PeakScaleHeight="80.846" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
