<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 05:50:00.000"
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) 05:50:00</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">
FF202609504050550009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="5.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.030" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="17.422" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="6.500" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" 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="0.800" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="5.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="365.936" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="338.863" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="287.714" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.360" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="73.074" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.651" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="39.098" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="66.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.050" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="55">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 282.500 285.000 286.667 288.333 290.000 295.000 295.000 295.000 305.000 305.000 315.000 325.000 335.000 318.333 301.667 285.000 350.000 355.000 365.000 300.000 305.000 310.000 310.000 310.000 310.000 320.000 320.000 320.000 325.000 330.000 325.000 330.000 331.667 333.333 335.000 335.000 335.000 337.500 340.000 343.333 346.667 350.000 352.500 355.000 360.059 365.936 372.848 381.093 391.100 403.499 419.266 439.988 468.437 509.923
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 0 72 0 0 0 72 69 69 66 69 66 60 57 0 63 60 51 51 54 57 60 69 69 69 66 69 66 66 63 63 66 60 0 60 63 63 63 0 60 0 0 57 63 57 0 63 57 60 60 54 0 51 0 48
</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 -1.171875 0.390625 0.390625 -0.390625 0.390625 -0.390625 -1.171875 -1.171875 -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 1.171875 0.390625 1.171875 0.390625 1.171875 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 -0.390625 0.390625 -0.390625 1.171875 1.171875 -0.390625 1.953125 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="151">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.145 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.289 185.0 190.0 195.0 200.0 205.0 210.0 215.0 218.434 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 338.863 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.333 0.315 0.291 0.258 0.213 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.212 0.233 0.254 0.275 0.297 0.318 0.339 0.354 0.377 0.47 0.599 0.756 0.936 1.137 1.365 1.623 1.917 2.253 2.63 3.039 3.457 3.86 4.229 4.554 4.834 5.069 5.265 5.424 5.549 5.642 5.706 5.742 5.75 5.75 5.737 5.707 5.663 5.605 5.535 5.454 5.364 5.266 5.162 5.052 4.937 4.818 4.697 4.573 4.449 4.323 4.198 4.073 3.948 3.825 3.703 3.583 3.465 3.35 3.236 3.126 3.017 2.912 2.809 2.709 2.612 2.517 2.426 2.337 2.251 2.168 2.087 2.01 1.934 1.862 1.792 1.724 1.658 1.595 1.535 1.476 1.42 1.365 1.313 1.262 1.214 1.167 1.122 1.078 1.037 0.997 0.958 0.921 0.885 0.851 0.818 0.786 0.755 0.726 0.698 0.67 0.644 0.619 0.595 0.572 0.549 0.528 0.507 0.487 0.468 0.45 0.433 0.416 0.399 0.384 0.369 0.354 0.34 0.327 0.314 0.302 0.29 0.279 0.268 0.257 0.247 0.238 0.228 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="5.75" PeakHeight="338.863" Num="5" zHalfNm="287.714" Error="4.117">
-132.917 20.061 -10.711 4.818 -1.68
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="108.434" Depth="0.154"/>
<TopsideChapman PeakHeight="338.863" PeakDensity="410204.72" PeakScaleHeight="39.098" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
