<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-29 -029 17:20:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x 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" >
2026.01.29 (029) 17:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202602901291720009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="9.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.273" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.274" 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="10.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="190.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="190.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="445.000" 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="3.189" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.266" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="409.486" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="249.592" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.111" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="204.285" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="56.579" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="110.760" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="251.900" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.410" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="112">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
195.000 190.000 195.000 200.000 205.000 212.143 219.286 226.429 233.571 240.714 247.857 255.000 260.000 268.333 276.667 285.000 285.000 289.000 293.000 297.000 301.000 305.000 310.000 312.857 315.714 318.571 321.429 324.286 327.143 330.000 335.000 340.000 345.000 340.000 347.500 355.000 355.000 355.000 355.000 355.000 358.750 362.500 366.250 370.000 373.333 376.667 380.000 380.000 382.500 385.000 390.000 390.000 390.000 392.500 395.000 400.000 405.000 405.000 410.000 410.000 415.000 420.000 420.000 425.000 430.000 430.000 435.000 440.000 445.000 445.000 450.000 455.000 460.000 465.000 470.000 475.000 485.000 495.000 500.000 505.000 505.000 520.000 525.000 535.000 540.000 545.000 550.000 555.000 570.000 575.000 580.000 580.000 585.000 595.000 600.000 605.000 610.000 615.000 625.000 625.000 635.000 640.000 645.000 650.000 660.000 670.000 679.832 690.967 703.684 718.344 735.432 755.603
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 45 0 45 48 0 0 0 0 0 0 48 48 0 51 45 51 0 0 0 0 54 57 0 0 0 0 0 0 54 0 0 51 60 0 51 57 60 57 45 0 57 0 57 0 0 48 54 45 57 54 63 63 0 63 57 57 63 60 63 60 54 57 51 48 51 57 60 54 57 57 57 54 0 51 57 54 45 51 57 60 51 54 45 54 60 60 57 45 48 54 57 57 54 51 51 57 57 48 54 51 54 54 54 51 45 45 48 48 48 45 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 -2.734375 -1.171875 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -2.734375 1.171875 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 2.734375 -1.953125 -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 -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 -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" >
89.514 90.0 95.0 100.0 105.0 110.0 112.39 114.779 115.0 117.169 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 409.486 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.145 2.76 3.085 3.189 3.067 3.067 3.078 3.189 3.26 3.388 3.52 3.656 3.797 3.942 4.093 4.247 4.405 4.565 4.726 4.887 5.046 5.203 5.356 5.507 5.653 5.796 5.936 6.072 6.204 6.333 6.46 6.583 6.704 6.823 6.939 7.053 7.166 7.276 7.385 7.493 7.599 7.704 7.808 7.911 8.013 8.114 8.214 8.313 8.412 8.51 8.607 8.704 8.8 8.895 8.989 9.083 9.175 9.265 9.353 9.438 9.52 9.595 9.663 9.721 9.765 9.792 9.8 9.8 9.798 9.792 9.782 9.768 9.752 9.732 9.708 9.682 9.653 9.62 9.585 9.548 9.507 9.465 9.42 9.373 9.323 9.272 9.219 9.164 9.107 9.048 8.988 8.927 8.864 8.8 8.735 8.668 8.601 8.532 8.463 8.393 8.322 8.25 8.178 8.105 8.032 7.958 7.884 7.81 7.735 7.66 7.585 7.509 7.434 7.358 7.283 7.207 7.132 7.056 6.981 6.906 6.831 6.756 6.682 6.608 6.534 6.46 6.387 6.314 6.242 6.169 6.098 6.026 5.955 5.885 5.815 5.746 5.677 5.608 5.54 5.473 5.406 5.34 5.274 5.209 5.144 5.08 5.017 4.954 4.892 4.83 4.769 4.708 4.648 4.589 4.53 4.472 4.415 4.358 4.301 4.246 4.19 4.136 4.082 4.029 3.976 3.924 3.872 3.821 3.771 3.721 3.672 3.623 3.575 3.527 3.48 3.434 3.388 3.343 3.298 3.254 3.21 3.167 3.124 3.082 3.041 2.999

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.189" PeakHeight="110.0" Num="3" Error="0.0">
-30.349 12.928 -3.065
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.189" EndFrequency="9.8" PeakHeight="409.486" Num="5" zHalfNm="249.592" Error="9.698">
-266.948 -48.251 35.357 -15.467 2.992
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.169" Depth="0.122"/>
<TopsideChapman PeakHeight="409.486" PeakDensity="1191563.2" PeakScaleHeight="110.76" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
