<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-04 -094 23:50:00.000"
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" >
2026.04.04 (094) 23:50:00</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">
FF202609404042350009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="6.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.695" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="18.727" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="1.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.500" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="315.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="315.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="467.399" 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="1.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="1.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="413.173" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="364.085" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.066" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="73.046" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="9.725" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="37.165" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="80.450" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.380" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="102">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 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 6.7 6.75 6.8 6.85 6.9 6.95
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
315.000 320.000 320.000 327.500 335.000 335.000 335.000 345.000 350.000 355.000 360.000 365.000 370.000 371.667 373.333 375.000 376.667 378.333 380.000 385.000 365.000 360.000 357.500 355.000 355.000 350.000 350.000 350.000 350.000 350.000 352.500 355.000 360.000 370.000 375.000 380.000 375.000 370.000 370.000 370.000 373.750 377.500 381.250 385.000 385.000 410.000 420.000 400.000 430.000 455.000 480.000 475.000 470.000 455.000 470.000 485.000 475.455 465.909 456.364 446.818 437.273 427.727 418.182 408.636 399.091 389.545 380.000 385.000 390.000 393.750 397.500 401.250 405.000 407.500 410.000 411.500 413.000 414.500 416.000 417.500 419.000 420.500 422.000 423.500 425.000 425.000 430.000 432.498 435.259 438.325 441.751 445.603 449.967 454.951 460.699 467.399 475.311 484.796 496.373 510.823 529.364 554.023
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 54 0 51 54 57 54 57 0 57 57 51 0 0 0 0 0 54 51 60 60 0 57 60 60 0 57 0 57 0 57 63 57 60 54 0 57 57 54 0 0 0 54 54 0 57 57 54 0 54 0 54 51 0 51 54 48 0 0 0 0 54 0 51 0 66 60 54 0 0 0 54 0 54 0 0 0 54 57 0 0 0 0 57 57 57 51 51 0 0 0 0 51 0 54 0 0 54 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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 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 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 1.171875 0.390625 0.390625 -1.171875 -0.390625 -1.171875 0.390625 -1.171875 -1.171875 -1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 0.390625 -0.390625 0.390625 -0.390625 -1.953125 0.390625 -0.390625 -0.390625 0.390625 1.171875 0.390625 1.171875 -0.390625 1.171875 0.390625 -1.171875 0.390625 -0.390625 1.171875 -0.390625 0.390625 0.390625 -1.171875 0.390625 -0.390625 -0.390625 0.390625 2.734375 0.390625 1.171875 1.171875 1.953125 1.953125 0.390625 1.171875 -1.171875 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="165">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.717 150.0 155.0 160.0 165.0 170.0 175.0 180.0 181.435 185.0 190.0 195.0 200.0 205.0 210.0 215.0 217.152 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 413.173 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0
</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 0.332 0.314 0.289 0.255 0.208 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.215 0.237 0.258 0.28 0.302 0.323 0.345 0.354 0.382 0.439 0.506 0.582 0.667 0.758 0.854 0.956 1.062 1.174 1.29 1.411 1.539 1.672 1.811 1.957 2.111 2.272 2.441 2.62 2.807 3.004 3.212 3.43 3.66 3.9 4.152 4.414 4.686 4.966 5.251 5.537 5.818 6.088 6.338 6.558 6.737 6.866 6.937 6.95 6.948 6.928 6.886 6.824 6.745 6.651 6.543 6.423 6.294 6.156 6.012 5.863 5.709 5.553 5.394 5.235 5.075 4.916 4.758 4.602 4.447 4.295 4.146 4.0 3.857 3.718 3.582 3.449 3.321 3.196 3.075 2.957 2.844 2.734 2.628 2.525 2.426 2.331 2.239 2.15 2.065 1.982 1.903 1.827 1.753 1.683 1.615 1.55 1.487 1.427 1.369 1.313 1.26 1.209 1.159 1.112 1.067 1.023 0.981 0.941 0.903 0.866 0.83 0.796 0.764 0.732 0.702 0.674 0.646 0.619 0.594 0.57 0.546 0.524 0.502 0.482 0.462 0.443 0.425 0.407 0.39 0.374 0.359 0.344 0.33 0.316 0.303 0.291 0.279 0.267 0.256 0.246 0.236 0.226 0.217 0.208

</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="6.95" PeakHeight="413.173" Num="5" zHalfNm="364.085" Error="9.313">
-172.952 -33.807 12.502 -0.507 -1.257
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="107.152" Depth="0.154"/>
<TopsideChapman PeakHeight="413.173" PeakDensity="599286.6" PeakScaleHeight="37.165" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
