<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 22:50:00.000"
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, Unidentified traces above foF2</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" >
2026.04.05 (095) 22:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609504052250009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.650" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.599" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="17.285" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.450" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.450" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.200" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="435.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="435.000" 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="2.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="507.500" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.450" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.450" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="437.768" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="378.656" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.783" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="89.081" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="10.461" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="42.892" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="100.300" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.390" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="45">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
435.000 450.000 460.000 460.000 465.000 470.000 475.000 475.000 480.000 485.000 485.000 485.000 485.000 485.000 485.000 490.000 492.500 495.000 497.500 500.000 500.000 500.000 505.000 505.000 510.000 510.000 512.500 515.000 517.500 520.000 520.000 520.000 521.250 522.500 523.750 525.000 520.000 520.000 515.000 510.000 510.000 507.500 526.429 549.691 578.966
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 57 48 0 57 54 57 60 0 0 0 0 0 54 57 0 57 0 54 0 54 54 57 51 51 0 0 54 54 54 51 0 0 0 51 51 57 0 54 54 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 1.171875 -0.390625 -2.734375 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -2.734375 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -2.734375 -0.390625 0.390625 -0.390625 -0.390625 2.734375 -0.390625 -1.171875 2.734375 -1.171875 -1.171875 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="184">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.806 145.0 150.0 155.0 160.0 165.0 170.0 175.0 177.613 180.0 185.0 190.0 195.0 200.0 205.0 210.0 211.419 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 437.768 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.343 0.329 0.309 0.28 0.241 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.211 0.234 0.256 0.279 0.302 0.325 0.348 0.354 0.405 0.467 0.527 0.591 0.659 0.733 0.815 0.904 1.002 1.11 1.225 1.349 1.479 1.615 1.755 1.898 2.044 2.192 2.341 2.492 2.644 2.797 2.951 3.106 3.262 3.42 3.579 3.74 3.902 4.067 4.234 4.403 4.575 4.749 4.927 5.108 5.291 5.478 5.668 5.859 6.049 6.235 6.407 6.55 6.636 6.65 6.648 6.632 6.6 6.554 6.495 6.424 6.342 6.251 6.152 6.045 5.933 5.815 5.693 5.568 5.44 5.31 5.179 5.047 4.915 4.783 4.651 4.52 4.391 4.263 4.136 4.012 3.89 3.77 3.653 3.537 3.425 3.315 3.208 3.103 3.002 2.902 2.806 2.712 2.621 2.533 2.447 2.364 2.283 2.205 2.129 2.056 1.985 1.916 1.85 1.786 1.723 1.663 1.605 1.549 1.494 1.442 1.391 1.342 1.295 1.249 1.205 1.162 1.121 1.082 1.043 1.006 0.971 0.936 0.903 0.871 0.84 0.81 0.781 0.753 0.726 0.701 0.676 0.652 0.628 0.606 0.584 0.563 0.543 0.524 0.505 0.487 0.47 0.453 0.437 0.421 0.406 0.392 0.378 0.364 0.351 0.339 0.327 0.315 0.304 0.293 0.282 0.272 0.262 0.253 0.244 0.235 0.227 0.219 0.211 0.203

</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="6.65" PeakHeight="437.768" Num="5" zHalfNm="378.656" Error="5.212">
-201.059 -46.814 31.018 -14.294 4.8
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="101.419" Depth="0.154"/>
<TopsideChapman PeakHeight="437.768" PeakDensity="548666.25" PeakScaleHeight="42.892" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
