<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 05:10:00.000"
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 2 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Severe F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, F2 cusps do not match</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" >
2026.04.01 (091) 05:10:00</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">
FF202609104010510009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="5.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.883" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="14.989" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.100" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="342.500" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="342.500" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="4.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="386.066" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.100" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="359.853" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="306.009" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.998" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="77.348" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="5.757" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="40.934" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="73.490" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.490" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="23">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
342.500 345.000 355.000 355.833 356.667 357.500 358.333 359.167 360.000 363.999 368.493 373.579 379.382 386.066 393.848 403.022 413.999 427.369 444.008 465.283 493.447 532.489 590.224
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 69 63 63 0 0 72 69 69 63 63 60 66 66 60 0 66 0 0 54 51 54 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 0.390625 -0.390625 -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 1.171875 -0.390625 -0.390625 -0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="157">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.841 150.0 155.0 160.0 165.0 170.0 175.0 180.0 183.683 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 220.524 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 359.853 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0
</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 0.317 0.293 0.262 0.22 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.206 0.226 0.247 0.268 0.289 0.31 0.331 0.352 0.354 0.425 0.514 0.613 0.724 0.846 0.981 1.132 1.299 1.487 1.695 1.925 2.178 2.451 2.74 3.037 3.333 3.621 3.892 4.142 4.367 4.565 4.736 4.88 4.997 5.087 5.15 5.188 5.2 5.2 5.192 5.17 5.136 5.09 5.033 4.968 4.894 4.813 4.726 4.634 4.537 4.437 4.334 4.228 4.122 4.014 3.905 3.797 3.689 3.581 3.475 3.369 3.266 3.163 3.063 2.964 2.867 2.773 2.681 2.591 2.503 2.417 2.334 2.254 2.175 2.099 2.025 1.953 1.884 1.817 1.752 1.689 1.628 1.569 1.512 1.458 1.405 1.353 1.304 1.256 1.21 1.166 1.123 1.081 1.041 1.003 0.966 0.93 0.896 0.863 0.831 0.8 0.77 0.741 0.714 0.687 0.662 0.637 0.613 0.59 0.568 0.547 0.527 0.507 0.488 0.47 0.452 0.436 0.419 0.404 0.389 0.374 0.36 0.347 0.334 0.321 0.309 0.298 0.286 0.276 0.265 0.255 0.246 0.237 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="5.2" PeakHeight="359.853" Num="5" zHalfNm="306.009" Error="4.147">
-144.92 9.499 -6.65 3.436 -0.694
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="110.524" Depth="0.154"/>
<TopsideChapman PeakHeight="359.853" PeakDensity="335483.88" PeakScaleHeight="40.934" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
