<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-30 -030 18:00:00.000"
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 1 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o 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" >
2026.01.30 (030) 18:00:00</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">
FF202603001301800009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="34" >
<URSI ID="00" Val="10.075" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.673" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.343" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.544" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="8.050" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="350.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="455.000" 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="3.056" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.202" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="398.705" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="213.914" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="265.172" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.283" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.200" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="161.082" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="70.392" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="53.513" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="98.780" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="210.300" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.550" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.100" Name="D1" QL="/" DL="/" />
<URSI ID="32" Val="4.350" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="87">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
350.000 350.000 350.000 360.000 360.000 360.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 420.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 445.000 445.000 450.000 455.000 455.000 455.000 460.000 465.000 470.000 475.000 480.000 485.000 490.000 495.000 500.000 505.000 510.000 515.000 520.000 525.000 530.000 535.000 540.000 545.000 550.000 555.000 560.000 565.000 570.000 575.000 580.000 585.000 595.000 600.000 610.000 620.000 630.000 648.750 665.409 685.042 708.522 737.105
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 51 57 60 60 57 57 60 60 57 60 63 60 63 63 57 63 63 63 66 66 66 66 66 63 66 66 66 66 66 66 69 63 69 63 66 69 66 69 66 57 66 60 66 63 69 66 63 66 69 66 63 66 66 66 63 63 60 60 60 60 57 57 60 60 57 57 60 57 57 54 54 54 54 54 54 54 51 51 51 51 48 0 45 42 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="27">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 240.000 244.000 248.000 252.000 256.000 260.000 262.500 265.000 265.000 269.474 273.947 278.421 282.895 287.368 291.842 296.316 300.789 305.263 309.737 314.211 318.684 323.158 327.632 332.105 336.579 341.053
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 0 0 0 0 45 0 54 51 0 0 0 0 0 51 0 0 0 51 0 0 0 0 0 0 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 -1.171875 2.734375 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 -1.953125 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="98">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.313 105.625 105.938 106.250 106.563 106.875 107.188 107.500 107.813 108.125 108.438 108.750 109.063 109.375 109.688 110.000 110.000 110.000 112.500 115.000 110.000 110.000 111.250 112.500 113.750 115.000 115.000 115.000 115.000 115.000 115.000 115.000 110.000 110.000 105.000 105.000 110.000 110.000 105.000 105.000 105.000 105.000 105.000 105.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 105.000 105.000 105.000 105.000 110.000 110.000 110.000 110.000 105.000 105.000 107.500 110.000 110.000 110.000 110.000 110.000 110.000 107.500 105.000 105.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 54 51 54 57 54 54 0 0 54 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 57 48 48 0 48 51 48 0 0 0 54 0 45 0 0 0 54 48 48 51 48 60 60 60 57 57 57 63 54 54 57 57 0 63 60 0 0 60 51 0 60 51 0 51 54 57 60 57 0 54 57 54 48 0 48 0 48 45 45 0 0 0 0 0 45 48 48 48 45 51 0 0 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</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" >
89.536 90.0 95.0 100.0 105.0 110.0 112.967 115.0 115.935 118.902 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 213.914 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 398.705 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.055 2.645 2.957 3.056 2.934 2.934 2.934 3.056 3.097 3.264 3.421 3.575 3.732 3.89 4.048 4.204 4.355 4.501 4.641 4.776 4.906 5.032 5.155 5.276 5.397 5.517 5.629 5.673 5.702 5.835 5.965 6.095 6.227 6.363 6.504 6.649 6.801 6.957 7.118 7.283 7.448 7.612 7.774 7.931 8.083 8.229 8.369 8.503 8.632 8.756 8.874 8.989 9.1 9.206 9.31 9.41 9.507 9.6 9.69 9.775 9.855 9.928 9.991 10.039 10.068 10.075 10.075 10.071 10.062 10.049 10.031 10.009 9.983 9.953 9.918 9.88 9.839 9.794 9.746 9.695 9.641 9.584 9.525 9.463 9.399 9.333 9.265 9.194 9.122 9.048 8.973 8.896 8.818 8.739 8.659 8.577 8.495 8.412 8.328 8.243 8.158 8.072 7.986 7.9 7.813 7.726 7.64 7.552 7.465 7.378 7.291 7.205 7.118 7.032 6.945 6.86 6.774 6.689 6.604 6.52 6.436 6.353 6.27 6.188 6.106 6.025 5.945 5.865 5.786 5.708 5.63 5.553 5.477 5.401 5.326 5.252 5.179 5.106 5.034 4.963 4.893 4.823 4.754 4.686 4.619 4.552 4.486 4.421 4.357 4.294 4.231 4.169 4.108 4.048 3.988 3.929 3.871 3.814 3.757 3.701 3.646 3.592 3.538 3.485 3.433 3.382 3.331 3.281 3.231 3.182 3.134 3.087 3.04 2.994 2.949 2.904 2.86 2.816 2.773 2.731 2.689 2.648 2.608 2.568 2.528 2.49 2.451

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.056" PeakHeight="110.0" Num="3" Error="0.0">
-30.242 12.771 -2.993
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.056" EndFrequency="5.673" PeakHeight="213.914" Num="5" Error="0.0">
-75.382 -27.8 10.906 -3.879 1.143
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.673" EndFrequency="10.075" PeakHeight="398.705" Num="5" zHalfNm="265.172" Error="3.89">
-160.624 -30.855 11.824 -7.453 2.317
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.902" Depth="0.122"/>
<TopsideChapman PeakHeight="398.705" PeakDensity="1259375.0" PeakScaleHeight="98.78" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
