<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 01:10:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: Moderate F-spread, F2x cusp not found, 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) 01:10:00</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">
FF202609504050110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.866" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.507" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="270.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="270.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="385.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="387.331" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="343.422" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.761" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="64.852" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="15.308" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="33.535" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="68.660" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.540" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="130">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
270.000 290.000 310.000 330.000 355.000 355.000 360.000 365.000 385.000 385.000 382.368 379.737 377.105 374.474 371.842 369.211 366.579 363.947 361.316 358.684 356.053 353.421 350.789 348.158 345.526 342.895 340.263 337.632 335.000 340.000 345.000 350.000 355.000 360.000 375.000 375.000 385.000 385.000 385.000 385.000 385.000 390.000 389.444 388.889 388.333 387.778 387.222 386.667 386.111 385.556 385.000 384.444 383.889 383.333 382.778 382.222 381.667 381.111 380.556 380.000 375.000 380.000 380.000 380.000 377.500 375.000 370.000 370.000 370.000 370.000 370.000 370.000 370.000 370.000 370.000 370.000 370.000 370.000 375.000 375.000 380.000 382.500 385.000 385.000 390.000 391.667 393.333 395.000 390.000 385.000 385.000 385.000 385.000 385.000 385.000 380.000 380.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 400.000 395.000 390.000 385.000 391.000 397.000 403.000 409.000 415.000 421.000 427.000 433.000 439.000 445.000 450.000 457.500 465.000 472.500 481.278 491.084 502.110
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 57 63 57 57 57 0 57 63 57 0 0 63 0 57 57 0 57 57 54 0 54 0 0 0 0 0 60 57 57 63 63 0 63 66 66 57 60 0 57 60 54 51 54 0 0 0 0 63 66 0 0 57 60 54 60 60 63 0 57 54 60 0 63 0 57 57 0 60 60 57 54 0 63 63 63 0 60 57 60 0 0 60 60 54 0 0 54 57 60 0 0 57 0 63 66 63 60 57 57 57 57 54 0 0 54 0 54 51 48 0 48 51 0 0 0 0 0 0 0 45 51 51 48 48 0 0 48 0 45
</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 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 0.390625 1.953125 0.390625 -0.390625 1.953125 0.390625 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 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 1.953125 -1.171875 -1.171875 0.390625 0.390625 0.390625 -0.390625 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 -0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 0.390625 -0.390625 0.390625 1.171875 0.390625 -0.390625 1.171875 1.171875 1.953125 1.171875 0.390625 -0.390625 1.953125 -2.734375 -0.390625 -2.734375 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 0.390625 -0.390625 1.171875 1.953125 1.953125 0.390625 0.390625 1.171875 1.953125 1.171875 1.953125 0.390625 0.390625 0.390625 0.390625 -2.734375 1.953125 1.171875 0.390625 2.734375 -0.390625 0.390625 0.390625 -0.390625 1.953125 1.953125 0.390625 -0.390625 0.390625 1.953125
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 147.08 150.0 155.0 160.0 165.0 170.0 175.0 180.0 184.16 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 221.24 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 387.331 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0
</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 0.334 0.317 0.294 0.264 0.222 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.203 0.224 0.245 0.266 0.287 0.307 0.328 0.349 0.354 0.401 0.486 0.602 0.739 0.889 1.045 1.208 1.377 1.553 1.739 1.935 2.143 2.364 2.601 2.855 3.128 3.422 3.74 4.084 4.456 4.855 5.283 5.737 6.21 6.694 7.175 7.638 8.066 8.443 8.756 8.998 9.16 9.241 9.25 9.244 9.205 9.131 9.027 8.897 8.743 8.569 8.38 8.177 7.963 7.741 7.512 7.28 7.045 6.81 6.575 6.342 6.111 5.884 5.66 5.442 5.228 5.02 4.818 4.621 4.431 4.247 4.069 3.897 3.731 3.571 3.417 3.27 3.127 2.991 2.86 2.734 2.613 2.498 2.387 2.281 2.179 2.082 1.989 1.9 1.815 1.733 1.655 1.581 1.509 1.441 1.376 1.314 1.255 1.198 1.144 1.092 1.042 0.995 0.95 0.907 0.866 0.827 0.789 0.753 0.719 0.686 0.655 0.625 0.597 0.57 0.544 0.519 0.496 0.473 0.452 0.431 0.411 0.393 0.375 0.358 0.341 0.326 0.311 0.297 0.283 0.271 0.258 0.246 0.235 0.225 0.214 0.205

</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="9.25" PeakHeight="387.331" Num="5" zHalfNm="343.422" Error="6.604">
-154.115 -18.381 6.592 2.441 -2.628
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="111.24" Depth="0.154"/>
<TopsideChapman PeakHeight="387.331" PeakDensity="1061569.5" PeakScaleHeight="33.535" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
