<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 00:10:00.000"
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" >
2026.03.31 (090) 00:10:00</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">
FF202609003310010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.650" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.798" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="18.604" 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="7.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="395.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="395.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="471.250" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="421.827" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="391.279" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.436" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="49.302" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.012" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="22.527" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="75.330" 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="77">
<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 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" >
430.000 420.000 410.000 405.000 405.000 400.000 395.000 395.000 400.714 406.429 412.143 417.857 423.571 429.286 435.000 440.000 441.667 443.333 445.000 447.500 450.000 452.500 455.000 460.000 463.333 466.667 470.000 472.500 475.000 480.000 470.000 455.000 455.000 455.000 450.000 450.000 445.000 450.000 450.000 450.714 451.429 452.143 452.857 453.571 454.286 455.000 455.714 456.429 457.143 457.857 458.571 459.286 460.000 460.714 461.429 462.143 462.857 463.571 464.286 465.000 465.714 466.429 467.143 467.857 468.571 469.286 470.000 470.714 471.429 472.143 472.857 473.571 474.286 475.000 475.000 475.000 471.250
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 57 54 54 54 57 54 0 57 0 0 0 0 0 54 0 0 60 0 57 0 51 51 0 0 57 0 54 51 57 0 54 48 57 51 54 54 0 0 51 0 0 0 0 48 0 0 0 0 0 0 51 54 0 0 0 0 0 0 0 0 0 0 0 0 0 54 0 51 0 0 0 51 48 48 51
</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 1.171875 -0.390625 -0.390625 -0.390625 1.171875 0.390625 -0.390625 0.390625 -1.171875 1.953125 -0.390625 0.390625 1.953125 -0.390625 1.171875 -0.390625 -0.390625 0.390625 -1.171875 0.390625 0.390625 0.390625 1.171875 0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 -1.953125 1.953125 0.390625 0.390625 0.390625 1.171875 -1.171875 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 1.953125 -0.390625 0.390625 1.171875 2.734375 2.734375 -0.390625 1.171875 0.390625 -1.171875 -1.171875 0.390625 -0.390625 2.734375 0.390625 0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="129">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.136 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.272 185.0 190.0 195.0 200.0 205.0 210.0 215.0 218.408 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 421.827 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0
</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 0.276 0.297 0.318 0.339 0.354 0.371 0.434 0.511 0.599 0.693 0.789 0.887 0.985 1.083 1.182 1.282 1.383 1.486 1.59 1.695 1.803 1.913 2.026 2.141 2.259 2.381 2.505 2.634 2.767 2.904 3.046 3.193 3.346 3.505 3.672 3.846 4.029 4.221 4.426 4.644 4.878 5.133 5.413 5.728 6.096 6.542 6.65 6.637 6.571 6.456 6.3 6.112 5.9 5.67 5.429 5.18 4.928 4.677 4.429 4.185 3.949 3.721 3.501 3.291 3.09 2.899 2.718 2.547 2.385 2.232 2.089 1.953 1.826 1.707 1.595 1.49 1.392 1.3 1.214 1.134 1.059 0.988 0.923 0.861 0.804 0.75 0.7 0.653 0.61 0.569 0.531 0.495 0.462 0.431 0.403 0.376 0.35 0.327 0.305 0.285 0.266 0.248 0.231 0.216 0.201

</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="421.827" Num="5" zHalfNm="391.279" Error="3.521">
-154.316 -82.144 42.587 -9.206 -0.34
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="108.408" Depth="0.154"/>
<TopsideChapman PeakHeight="421.827" PeakDensity="548666.25" PeakScaleHeight="22.527" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
