<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-04 -094 10:50:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</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) 10:50:00</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">
FF202609404041050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="10.650" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.911" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.001" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.250" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.250" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.710" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.100" 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="24" Val="98.448" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="100.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="97.057" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="6.918" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="402.300" 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="2.633" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="308.989" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="232.547" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.722" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.750" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="104.648" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="35.736" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="58.220" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="125.070" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.490" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="127">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
245.000 245.000 245.000 250.000 255.000 255.000 255.000 257.500 260.000 260.000 260.000 263.333 266.667 270.000 270.000 270.000 272.500 275.000 280.000 281.667 283.333 285.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 281.667 283.333 285.000 280.000 280.000 280.000 280.000 285.000 286.667 288.333 290.000 291.667 293.333 295.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 301.667 303.333 305.000 306.667 308.333 310.000 310.000 310.000 310.000 315.000 315.000 320.000 320.833 321.667 322.500 323.333 324.167 325.000 320.000 320.000 323.333 326.667 330.000 330.000 332.500 335.000 335.000 335.000 335.000 335.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 362.500 365.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 397.170 399.588 402.300 405.362 408.847 412.849 417.493 422.945 429.438 437.300 447.017 459.331 475.446 497.441 529.253
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 57 57 60 51 45 51 0 54 60 51 51 0 54 45 48 0 57 48 0 0 51 60 57 72 63 60 57 54 51 0 0 54 60 0 0 54 57 0 0 0 48 0 57 0 63 66 66 69 66 60 0 0 0 0 0 57 0 45 63 57 57 45 0 0 0 0 0 63 69 60 0 0 63 69 57 60 63 69 66 66 66 69 54 0 54 69 72 72 72 75 75 72 69 72 69 72 66 69 72 63 66 66 63 66 63 66 60 66 57 63 60 66 60 60 60 60 60 60 60 57 57 54 54 48 45 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 -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 1.171875 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="10">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
98.448 99.026 99.655 100.344 101.107 101.960 102.931 104.058 105.408 107.104
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 60 60 0 60 0 0 66
</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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="31">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9 3.95 4.0 4.05 4.1 4.15 4.2 4.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 100.000 100.000 101.250 102.500 103.750 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 106.250 107.500 108.750 110.000 105.000 100.000 105.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 72 75 0 0 0 63 0 0 0 0 0 0 0 0 0 0 0 66 54 60 0 66 0 51 0 45 48 75 66 57
</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 -2.734375 -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 1.171875 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" >
90.0 95.0 97.057 100.0 101.985 105.0 106.912 110.0 111.84 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 308.989 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.585 2.71 2.665 2.583 2.583 2.583 2.663 2.71 2.837 3.016 3.184 3.346 3.505 3.665 3.825 3.987 4.153 4.322 4.496 4.676 4.861 5.052 5.25 5.456 5.669 5.89 6.119 6.358 6.604 6.859 7.121 7.391 7.667 7.947 8.229 8.512 8.793 9.067 9.332 9.584 9.818 10.031 10.217 10.374 10.499 10.587 10.638 10.65 10.65 10.639 10.614 10.576 10.525 10.462 10.388 10.305 10.211 10.11 10.0 9.883 9.761 9.632 9.498 9.36 9.218 9.073 8.925 8.774 8.622 8.468 8.313 8.158 8.002 7.845 7.689 7.534 7.379 7.225 7.072 6.92 6.77 6.622 6.475 6.33 6.186 6.045 5.906 5.769 5.634 5.501 5.371 5.243 5.117 4.994 4.873 4.754 4.638 4.524 4.413 4.303 4.196 4.092 3.989 3.889 3.791 3.696 3.602 3.511 3.422 3.334 3.249 3.166 3.085 3.006 2.929 2.853 2.78 2.708 2.638 2.569 2.503 2.438 2.375 2.313 2.253 2.194 2.137 2.081 2.027 1.974 1.922 1.872 1.823 1.775 1.728 1.683 1.639 1.596 1.554 1.513 1.473 1.435 1.397 1.36 1.324 1.289 1.255 1.222 1.19 1.159 1.128 1.098 1.069 1.041 1.014 0.987 0.961 0.936 0.911 0.887 0.863 0.841 0.818 0.797 0.776 0.755 0.735 0.716 0.697 0.678 0.66 0.643 0.626 0.609 0.593 0.578 0.562 0.547 0.533 0.519 0.505 0.492 0.479 0.466 0.454 0.442 0.43

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.71" PeakHeight="97.057" Num="3" Error="1.595">
-10.353 4.261 -0.965
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.71" EndFrequency="10.65" PeakHeight="308.989" Num="5" zHalfNm="232.547" Error="2.548">
-169.34 -32.999 2.226 2.507 0.457
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="14.783" Depth="0.127"/>
<TopsideChapman PeakHeight="308.989" PeakDensity="1407227.0" PeakScaleHeight="58.22" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
