<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-06 -037 20:00:00.000"
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="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: 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" >
2026.02.06 (037) 20:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.13" 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">
FF202603702062000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="11.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.821" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.720" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.750" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.750" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.310" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="235.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="235.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="96.071" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="100.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="96.361" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="6.261" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="425.000" 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="2.312" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="330.073" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="261.944" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.474" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.350" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="93.831" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="36.975" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="49.999" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="109.520" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.420" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="170">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
235.000 236.667 238.333 240.000 241.667 243.333 245.000 245.833 246.667 247.500 248.333 249.167 250.000 250.000 250.000 255.000 255.000 265.000 260.000 262.500 265.000 270.000 268.333 266.667 265.000 265.000 270.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 281.250 282.500 283.750 285.000 286.667 288.333 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 300.000 302.500 305.000 307.500 310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 317.500 320.000 320.000 320.000 320.000 320.000 320.000 323.333 326.667 330.000 330.000 330.000 330.000 330.000 330.000 332.500 335.000 335.000 335.000 336.667 338.333 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 352.500 355.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 365.000 365.000 367.500 370.000 370.000 370.000 370.000 372.500 375.000 375.000 375.000 377.500 380.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 395.000 400.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 435.000 440.000 445.000 445.000 450.000 455.000 461.382 468.763 477.398 487.636 499.969
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 0 0 0 0 0 51 0 0 0 0 0 57 60 48 57 51 48 57 0 60 0 0 0 60 51 0 51 0 0 63 0 0 63 0 63 63 0 0 0 63 0 0 66 0 60 0 66 60 0 69 69 69 0 57 0 48 69 0 66 60 54 0 0 0 72 69 0 78 72 0 0 60 69 60 72 75 69 0 75 72 66 0 69 60 0 0 60 72 69 63 72 72 0 72 69 72 0 0 72 75 75 66 69 69 72 72 63 66 66 72 72 0 69 72 60 72 69 69 57 60 63 63 48 57 0 60 66 54 60 63 72 0 60 60 63 66 63 66 54 57 60 60 60 60 48 54 57 48 57 51 54 48 54 48 54 48 51 51 54 54 54 57 57 54 54 54 54 45 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -2.734375 -0.390625 -0.390625 0.390625 0.390625 -0.390625 2.734375 -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 -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 0.390625 -0.390625 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 0.390625 0.390625 0.390625 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 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="12">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
96.071 96.535 97.034 97.571 98.154 98.789 99.486 100.258 101.123 102.107 103.250 104.619
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 0 0 0 0 60 0 54 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 1.953125 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 2.734375 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="9">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 0 0 0 0 54 51 66
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 1.171875 2.734375 -0.390625 0.390625 0.390625 0.390625 -2.734375 -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 96.361 100.0 102.9 105.0 109.44 110.0 115.0 115.979 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 330.073 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.254 2.31 2.271 2.183 2.183 2.183 2.194 2.291 2.31 2.404 2.518 2.629 2.741 2.855 2.971 3.091 3.215 3.345 3.481 3.625 3.776 3.937 4.108 4.291 4.486 4.694 4.916 5.152 5.403 5.667 5.944 6.232 6.529 6.833 7.142 7.454 7.767 8.081 8.394 8.705 9.014 9.32 9.623 9.922 10.214 10.498 10.77 11.023 11.249 11.433 11.556 11.6 11.6 11.589 11.557 11.505 11.435 11.348 11.246 11.129 11.0 10.86 10.709 10.549 10.382 10.208 10.028 9.843 9.654 9.462 9.267 9.071 8.873 8.676 8.478 8.28 8.083 7.888 7.694 7.502 7.312 7.124 6.939 6.757 6.578 6.402 6.229 6.059 5.893 5.73 5.57 5.414 5.261 5.112 4.966 4.824 4.685 4.55 4.418 4.289 4.164 4.042 3.923 3.808 3.695 3.586 3.479 3.376 3.275 3.177 3.082 2.99 2.9 2.813 2.728 2.646 2.566 2.488 2.413 2.34 2.269 2.2 2.133 2.068 2.005 1.944 1.885 1.828 1.772 1.718 1.665 1.615 1.565 1.517 1.471 1.426 1.382 1.34 1.299 1.259 1.221 1.183 1.147 1.112 1.078 1.045 1.013 0.982 0.951 0.922 0.894 0.866 0.84 0.814 0.789 0.765 0.741 0.719 0.696 0.675 0.654 0.634 0.615 0.596 0.577 0.56 0.543 0.526 0.51 0.494 0.479 0.464 0.45 0.436 0.423 0.41 0.397 0.385 0.373 0.361 0.35 0.34 0.329 0.319 0.309 0.3 0.29

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.31" PeakHeight="96.361" Num="3" Error="1.479">
-9.233 3.663 -0.791
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.31" EndFrequency="11.6" PeakHeight="330.073" Num="5" zHalfNm="261.944" Error="3.339">
-166.992 -50.559 5.212 -4.853 3.098
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.618" Depth="0.127"/>
<TopsideChapman PeakHeight="330.073" PeakDensity="1669478.9" PeakScaleHeight="49.999" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
