<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 09:00:00.000"
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 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Trace overlaps while constructing baseline</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) 09:00:00</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">
FF202602801280900009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="5.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.136" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="16.462" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="4.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="342.174" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.019" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="298.249" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="225.834" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="4.494" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="103.279" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="8.055" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="56.330" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="91.330" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.380" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="49">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 260.000 260.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 265.000 265.000 265.000 265.000 265.000 280.000 278.333 276.667 275.000 273.333 271.667 270.000 275.000 280.000 280.000 280.000 290.000 293.333 296.667 300.000 305.000 310.000 310.000 315.000 320.000 323.158 326.806 331.067 336.111 342.174 349.600 358.907 370.915 386.996 409.649 443.935 501.911 621.088
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 63 54 69 0 63 0 66 63 72 69 0 66 75 69 57 54 0 0 0 60 0 51 0 69 66 75 0 0 0 57 63 54 63 0 69 60 57 63 0 0 0 0 0 0 0 57 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 1.171875 0.390625 0.390625 -0.390625 -2.734375 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 1.171875 0.390625 1.171875 1.171875 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 -1.171875 1.171875 2.734375 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="182">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.252 95.0 100.0 105.0 110.0 115.0 120.0 125.0 126.562 130.0 135.0 140.0 143.125 145.0 150.0 155.0 159.687 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 298.249 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.678 0.883 0.986 1.019 1.002 0.949 0.854 0.814 0.814 0.814 0.814 0.814 0.837 0.899 0.961 1.019 1.026 1.147 1.288 1.445 1.614 1.793 1.983 2.185 2.401 2.632 2.88 3.14 3.407 3.67 3.918 4.143 4.343 4.516 4.666 4.793 4.901 4.992 5.067 5.128 5.176 5.211 5.235 5.248 5.25 5.25 5.243 5.229 5.208 5.18 5.146 5.107 5.062 5.013 4.959 4.902 4.84 4.776 4.709 4.64 4.568 4.494 4.419 4.343 4.266 4.187 4.108 4.029 3.95 3.87 3.791 3.711 3.633 3.554 3.476 3.399 3.323 3.247 3.173 3.099 3.026 2.955 2.884 2.815 2.747 2.68 2.614 2.549 2.486 2.424 2.363 2.303 2.245 2.188 2.132 2.077 2.024 1.971 1.92 1.87 1.822 1.774 1.727 1.682 1.638 1.595 1.552 1.511 1.471 1.432 1.394 1.357 1.321 1.285 1.251 1.217 1.185 1.153 1.122 1.092 1.062 1.034 1.006 0.979 0.952 0.926 0.901 0.877 0.853 0.83 0.808 0.786 0.764 0.744 0.723 0.704 0.685 0.666 0.648 0.63 0.613 0.596 0.58 0.564 0.549 0.534 0.52 0.505 0.492 0.478 0.465 0.452 0.44 0.428 0.416 0.405 0.394 0.383 0.373 0.363 0.353 0.343 0.334 0.325 0.316 0.307 0.299 0.291 0.283 0.275 0.267 0.26 0.253 0.246 0.239 0.233 0.226 0.22 0.214 0.208 0.203

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.019" PeakHeight="110.0" Num="3" Error="0.0">
-26.588 8.087 -1.247
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.019" EndFrequency="5.25" PeakHeight="298.249" Num="5" zHalfNm="225.834" Error="3.581">
-153.68 24.606 -13.262 5.112 -1.338
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="49.687" Depth="0.205"/>
<TopsideChapman PeakHeight="298.249" PeakDensity="341966.5" PeakScaleHeight="56.33" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
