<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 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 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 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" >
2026.01.28 (028) 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">
FF202602801281800009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.352" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.870" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.800" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="240.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="590.000" 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="3.053" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.200" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="398.286" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="281.553" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.282" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.400" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="144.632" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="45.948" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="80.623" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="208.950" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.030" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="113">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 245.000 250.000 250.000 255.000 260.000 265.000 270.000 275.000 280.000 285.000 290.000 295.000 300.000 305.000 310.000 315.000 320.000 325.000 330.000 335.000 342.500 350.000 355.000 360.000 365.000 367.500 370.000 370.000 375.000 385.000 385.000 388.125 391.250 394.375 397.500 400.625 403.750 406.875 410.000 410.000 415.000 415.000 420.000 425.000 430.000 435.000 435.000 435.000 440.000 440.000 445.000 445.000 445.000 450.000 450.000 455.000 455.000 460.000 460.000 460.000 465.000 470.000 470.000 475.000 475.000 480.000 480.000 485.000 485.000 490.000 490.000 495.000 495.000 495.000 500.000 505.000 510.000 515.000 520.000 520.000 525.000 525.000 530.000 535.000 535.000 535.000 540.000 540.000 545.000 547.500 550.000 555.000 555.000 557.500 560.000 565.000 565.000 567.500 570.000 575.000 575.000 580.000 580.000 585.000 590.000 590.000 594.377 599.369 605.118 611.809 619.693 629.123
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 48 48 51 0 0 0 54 54 0 54 51 54 54 0 0 51 54 54 48 0 54 57 57 57 0 60 54 57 0 57 0 0 54 0 54 0 0 60 51 57 54 0 57 0 45 57 60 51 60 51 57 63 57 60 57 63 54 63 63 63 57 63 54 60 54 63 57 63 60 63 60 63 63 60 63 63 60 54 63 60 63 60 51 60 63 60 63 60 51 60 54 54 51 60 54 57 48 57 51 57 51 54 54 51 54 54 51 51 51 48 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 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 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="9">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
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 51 54 45 57 57 0 57 57
</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
</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" >
89.537 90.0 95.0 100.0 105.0 110.0 112.984 115.0 115.968 118.952 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 398.286 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.052 2.642 2.954 3.053 2.931 2.931 2.931 3.053 3.074 3.178 3.289 3.406 3.53 3.659 3.791 3.927 4.064 4.203 4.341 4.48 4.617 4.753 4.888 5.021 5.153 5.284 5.413 5.541 5.668 5.794 5.918 6.042 6.166 6.288 6.411 6.532 6.654 6.775 6.897 7.018 7.139 7.261 7.383 7.506 7.629 7.753 7.877 8.003 8.13 8.258 8.387 8.518 8.651 8.785 8.922 9.061 9.202 9.346 9.491 9.638 9.784 9.925 10.048 10.132 10.15 10.15 10.143 10.13 10.109 10.082 10.049 10.009 9.964 9.914 9.858 9.798 9.733 9.664 9.591 9.514 9.433 9.35 9.263 9.174 9.083 8.989 8.893 8.795 8.695 8.594 8.492 8.388 8.284 8.179 8.073 7.966 7.859 7.752 7.644 7.537 7.429 7.322 7.215 7.108 7.002 6.896 6.791 6.686 6.582 6.478 6.376 6.274 6.173 6.073 5.974 5.875 5.778 5.682 5.587 5.493 5.4 5.308 5.217 5.128 5.039 4.952 4.866 4.781 4.697 4.614 4.533 4.453 4.374 4.296 4.219 4.143 4.069 3.995 3.923 3.852 3.782 3.714 3.646 3.579 3.514 3.449 3.386 3.324 3.262 3.202 3.143 3.085 3.028 2.972 2.916 2.862 2.809 2.756 2.705 2.654 2.605 2.556 2.508 2.461 2.415 2.369 2.325 2.281 2.238 2.196 2.154 2.114 2.074 2.035 1.996 1.958 1.921 1.885 1.849 1.814 1.78 1.746 1.713 1.68 1.648 1.617

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.053" PeakHeight="110.0" Num="3" Error="0.0">
-30.239 12.767 -2.991
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.053" EndFrequency="10.15" PeakHeight="398.286" Num="5" zHalfNm="281.553" Error="5.076">
-220.202 -87.098 37.779 -10.021 0.208
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.952" Depth="0.122"/>
<TopsideChapman PeakHeight="398.286" PeakDensity="1278194.8" PeakScaleHeight="80.623" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
