<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-29 -029 13:00:00.000"
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 1 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) 13:00:00</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">
FF202602901291300009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="33" >
<URSI ID="00" Val="10.525" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.423" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.497" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.222" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.250" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.360" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="220.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="310.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="103.122" Name="h`E" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="507.192" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" 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="4.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.266" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="368.216" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="183.714" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="245.967" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.721" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="147.419" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="56.123" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="52.943" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="89.533" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="192.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.530" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.110" Name="D1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="99">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 320.000 320.000 320.000 322.500 325.000 326.667 328.333 330.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 355.000 355.000 355.000 360.000 362.500 365.000 367.500 370.000 370.000 371.667 373.333 375.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 410.000 410.000 415.000 415.000 420.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 445.000 450.000 450.000 460.000 460.000 465.000 465.000 470.000 470.000 470.000 475.000 480.000 480.000 480.000 490.000 495.000 495.000 500.000 500.000 503.427 507.192 511.348 515.961 521.107 526.888 533.427 540.883 549.466 559.450 571.210 585.265 602.360 623.601 650.704 686.485
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 54 57 54 48 66 57 45 48 0 57 0 51 0 0 60 60 66 66 60 60 0 57 60 60 57 60 63 54 57 54 54 0 45 0 45 51 0 0 48 48 57 54 63 63 63 66 66 66 63 60 57 54 57 54 60 60 57 60 57 54 57 60 60 63 63 60 54 54 51 51 51 51 54 54 57 51 0 51 51 54 51 51 54 54 54 57 57 54 54 54 48 48 0 48 42 0 0 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 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="19">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
220.000 225.000 225.000 230.000 230.000 234.444 238.889 243.333 247.778 252.222 256.667 261.111 265.556 270.000 274.444 278.889 283.333 287.778 292.222
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 48 51 45 0 0 45 0 48 0 0 0 0 0 0 45 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 -2.734375 -1.171875 2.734375 0.390625 -1.953125 -0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="3">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.25 3.3 3.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
103.122 105.405 109.166
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.488 90.0 95.0 100.0 105.0 110.0 112.391 114.781 115.0 117.172 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 183.714 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 368.216 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.26 2.908 3.251 3.36 3.231 3.231 3.243 3.36 3.486 3.681 3.866 4.048 4.227 4.397 4.558 4.708 4.85 4.985 5.116 5.246 5.37 5.423 5.455 5.586 5.724 5.871 6.026 6.187 6.354 6.525 6.7 6.877 7.055 7.232 7.408 7.583 7.755 7.926 8.093 8.258 8.42 8.579 8.736 8.889 9.04 9.188 9.332 9.473 9.61 9.743 9.87 9.991 10.105 10.21 10.304 10.385 10.449 10.495 10.52 10.525 10.525 10.519 10.508 10.49 10.467 10.439 10.405 10.367 10.323 10.276 10.224 10.167 10.107 10.044 9.977 9.907 9.833 9.757 9.679 9.598 9.514 9.429 9.341 9.252 9.161 9.069 8.976 8.881 8.785 8.688 8.591 8.492 8.393 8.294 8.194 8.094 7.994 7.894 7.793 7.693 7.593 7.493 7.393 7.294 7.195 7.096 6.998 6.9 6.803 6.707 6.611 6.516 6.421 6.328 6.235 6.143 6.051 5.961 5.872 5.783 5.695 5.608 5.522 5.437 5.353 5.27 5.188 5.107 5.027 4.948 4.87 4.792 4.716 4.641 4.567 4.493 4.421 4.35 4.28 4.21 4.142 4.074 4.008 3.942 3.878 3.814 3.751 3.69 3.629 3.569 3.51 3.452 3.394 3.338 3.282 3.227 3.174 3.121 3.068 3.017 2.966 2.916 2.867 2.819 2.772 2.725 2.679 2.634 2.589 2.545 2.502 2.46 2.418 2.377 2.337 2.297 2.258 2.22 2.182 2.145 2.108 2.072 2.037 2.002 1.968 1.934 1.901

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.36" PeakHeight="110.0" Num="3" Error="0.0">
-30.479 13.119 -3.152
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.36" EndFrequency="5.423" PeakHeight="183.714" Num="5" Error="0.0">
-53.077 -19.426 7.787 -2.572 0.746
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.423" EndFrequency="10.525" PeakHeight="368.216" Num="5" zHalfNm="245.967" Error="3.797">
-161.514 -26.834 6.857 -3.058 0.047
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.172" Depth="0.129"/>
<TopsideChapman PeakHeight="368.216" PeakDensity="1374387.4" PeakScaleHeight="89.533" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
