<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-25 -084 23:30:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2, 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" >
2026.03.25 (084) 23:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202608403252330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.814" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="18.993" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="430.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="430.000" 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="0.600" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="458.574" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="408.040" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="377.886" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.763" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="48.766" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.069" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="22.085" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="72.980" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="72">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
430.000 430.000 433.333 436.667 440.000 440.000 440.000 440.000 440.000 440.000 440.000 440.000 440.000 440.000 437.500 435.000 432.500 430.000 430.000 430.833 431.667 432.500 433.333 434.167 435.000 435.833 436.667 437.500 438.333 439.167 440.000 440.000 438.333 436.667 435.000 435.000 435.000 437.500 440.000 435.000 440.000 440.000 440.000 442.500 445.000 445.000 445.000 445.000 447.500 450.000 455.000 460.000 459.091 458.182 457.273 456.364 455.455 454.545 453.636 452.727 451.818 450.909 450.000 445.000 446.000 447.000 448.000 449.000 450.000 455.000 458.574 470.182
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 57 0 0 63 63 63 0 66 0 57 0 0 54 0 0 0 54 0 57 0 0 63 0 0 0 0 0 0 0 57 54 0 0 57 0 0 0 57 57 57 0 51 0 51 0 57 51 54 54 51 54 0 54 0 51 0 0 0 0 0 0 57 57 0 0 0 0 60 54 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 0.390625 -1.171875 1.171875 0.390625 0.390625 -0.390625 -1.953125 0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -1.171875 -1.171875 -1.171875 -1.953125 0.390625 -1.953125 1.171875 1.953125 -0.390625 -0.390625 0.390625 -2.734375 1.171875 -1.171875 -0.390625 -1.171875 1.171875 -1.171875 0.390625 -1.953125 1.171875 -1.953125 2.734375 1.171875 -1.171875 1.171875 -2.734375 0.390625 -1.953125 -1.953125 -0.390625 0.390625 -1.171875 -0.390625 1.953125 -2.734375 -0.390625 -0.390625 2.734375 -2.734375 -2.734375 1.171875 -0.390625 2.734375 1.171875 -0.390625 1.171875 -0.390625 0.390625 -2.734375 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="125">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.106 150.0 155.0 160.0 165.0 170.0 175.0 180.0 180.213 185.0 190.0 195.0 200.0 205.0 210.0 215.0 215.319 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 408.04 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.331 0.312 0.286 0.251 0.201 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.221 0.243 0.265 0.287 0.309 0.331 0.353 0.354 0.4 0.467 0.558 0.669 0.788 0.91 1.03 1.149 1.266 1.382 1.499 1.616 1.734 1.853 1.973 2.096 2.221 2.348 2.478 2.612 2.749 2.89 3.036 3.186 3.341 3.503 3.671 3.846 4.029 4.222 4.425 4.642 4.873 5.123 5.397 5.703 6.057 6.495 6.75 6.745 6.689 6.579 6.425 6.235 6.019 5.783 5.534 5.277 5.016 4.756 4.499 4.247 4.002 3.766 3.539 3.322 3.116 2.919 2.733 2.557 2.391 2.235 2.088 1.95 1.821 1.7 1.586 1.48 1.38 1.287 1.2 1.119 1.044 0.973 0.907 0.845 0.788 0.734 0.684 0.638 0.594 0.554 0.516 0.481 0.448 0.418 0.389 0.363 0.338 0.315 0.293 0.273 0.255 0.237 0.221 0.206

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="6.75" PeakHeight="408.04" Num="5" zHalfNm="377.886" Error="3.97">
-148.258 -76.058 43.58 -11.449 -0.536
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="105.319" Depth="0.154"/>
<TopsideChapman PeakHeight="408.04" PeakDensity="565291.56" PeakScaleHeight="22.085" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
