<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-04 -035 21:00:00.000"
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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: F2x cusp not found, Multiple candidates for F2o cusp, 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" >
2026.02.04 (035) 21:00:00</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">
FF202603502042100009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="10.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.281" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.498" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.600" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="290.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="290.000" Name="h`F2" 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="9.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="597.000" 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="1.446" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="452.757" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="338.891" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.235" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.700" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="161.078" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="46.875" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="81.853" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="177.140" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.550" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="151">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
290.000 290.833 291.667 292.500 293.333 294.167 295.000 295.000 295.000 295.000 300.000 301.000 302.000 303.000 304.000 305.000 310.000 310.000 310.000 310.000 311.000 312.000 313.000 314.000 315.000 320.000 325.000 326.667 328.333 330.000 331.667 333.333 335.000 335.000 335.000 335.000 335.000 337.500 340.000 345.000 345.000 346.250 347.500 348.750 350.000 351.250 352.500 353.750 355.000 358.571 362.143 365.714 369.286 372.857 376.429 380.000 380.000 382.500 385.000 387.500 390.000 390.000 390.000 393.333 396.667 400.000 402.500 405.000 407.500 410.000 415.000 415.000 415.000 417.500 420.000 425.000 430.000 435.000 435.000 435.000 440.000 445.000 445.000 450.000 455.000 455.000 460.000 460.000 465.000 465.000 470.000 473.000 476.000 479.000 482.000 485.000 490.000 495.000 495.000 495.000 495.000 500.000 500.000 500.000 505.000 505.000 510.000 510.000 510.000 510.000 512.500 515.000 520.000 521.250 522.500 523.750 525.000 535.000 535.000 535.000 540.000 545.000 545.000 545.000 550.000 555.000 555.000 560.000 560.000 565.000 570.000 570.000 575.000 575.000 585.000 585.000 588.000 591.000 594.000 597.000 600.000 607.938 616.531 625.863 636.034 647.162 659.389 672.887 687.864 704.578 723.349
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 57 0 54 0 60 60 66 66 66 0 63 0 0 60 60 57 48 60 0 0 0 0 60 0 48 0 0 0 0 0 48 51 0 57 0 0 0 54 57 0 0 0 0 0 48 0 66 0 60 0 0 0 0 51 60 0 57 0 54 63 66 0 0 63 0 66 0 69 60 66 66 0 63 66 63 54 60 63 0 54 63 60 57 60 60 63 63 60 66 0 66 0 0 63 60 48 54 63 69 66 69 69 72 66 66 0 69 57 0 66 66 0 66 0 63 51 57 63 60 54 57 63 63 57 66 60 66 66 60 66 66 66 66 66 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.953125 1.171875 -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 1.953125 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 2.734375 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.171875 1.953125 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 1.953125 0.390625 0.390625 0.390625 -1.953125 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="19">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
95.000 95.000 95.000 97.500 100.000 105.000 106.875 108.750 110.625 112.500 114.375 116.250 118.125 120.000 120.000 121.667 123.333 125.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 72 69 0 66 54 0 0 0 0 0 0 0 57 60 0 0 0 63
</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 1.953125 1.171875 -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" >
89.96 90.0 95.0 100.0 105.0 110.0 115.0 120.0 121.672 125.0 130.0 133.344 135.0 140.0 145.0 145.016 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 452.757 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.203 0.966 1.253 1.4 1.446 1.42 1.338 1.297 1.297 1.297 1.297 1.318 1.382 1.446 1.446 1.529 1.613 1.7 1.791 1.886 1.987 2.093 2.206 2.326 2.453 2.588 2.731 2.882 3.04 3.204 3.374 3.548 3.725 3.904 4.084 4.264 4.444 4.623 4.801 4.978 5.153 5.327 5.499 5.67 5.84 6.008 6.175 6.341 6.506 6.67 6.833 6.996 7.158 7.319 7.48 7.64 7.8 7.959 8.118 8.277 8.435 8.592 8.749 8.904 9.058 9.211 9.36 9.507 9.648 9.784 9.91 10.025 10.126 10.207 10.265 10.295 10.3 10.299 10.292 10.278 10.257 10.23 10.196 10.157 10.112 10.062 10.006 9.946 9.881 9.812 9.74 9.663 9.583 9.5 9.414 9.326 9.234 9.141 9.045 8.948 8.849 8.748 8.646 8.543 8.439 8.334 8.228 8.122 8.015 7.908 7.801 7.693 7.586 7.478 7.371 7.264 7.158 7.052 6.946 6.841 6.737 6.633 6.53 6.428 6.326 6.226 6.126 6.027 5.929 5.832 5.737 5.642 5.548 5.456 5.364 5.274 5.184 5.096 5.009 4.923 4.839 4.755 4.672 4.591 4.511 4.432 4.354 4.278 4.202 4.128 4.054 3.982 3.911 3.841 3.772 3.705 3.638 3.573 3.508 3.445 3.382 3.321 3.26 3.201 3.143 3.085 3.029 2.973 2.919 2.865 2.813 2.761 2.71 2.66 2.611 2.563 2.516 2.469 2.423 2.379 2.334 2.291 2.249 2.207 2.166 2.125 2.086

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.446" PeakHeight="110.0" Num="3" Error="0.0">
-27.994 9.724 -1.77
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.446" EndFrequency="10.3" PeakHeight="452.757" Num="5" zHalfNm="338.891" Error="4.572">
-278.454 -45.872 28.35 -15.937 4.172
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="35.016" Depth="0.149"/>
<TopsideChapman PeakHeight="452.757" PeakDensity="1316253.1" PeakScaleHeight="81.853" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
