<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-10 -100 03:20:00.000"
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 22 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</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" >
2026.04.10 (100) 03:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.20" 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">
FF202610004100320009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.348" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="15.500" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.200" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="480.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="480.000" 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="5.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="521.669" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="476.260" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="388.956" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="5.447" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="126.760" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="15.023" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="65.734" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="125.030" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.090" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="27">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
505.000 498.750 492.500 486.250 480.000 480.000 485.031 490.329 495.915 501.813 508.051 514.658 521.669 529.122 537.059 545.530 554.589 564.302 574.741 585.991 598.149 611.331 625.672 641.332 658.500 677.407 698.330
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
12 0 0 0 12 0 12 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
2.734375 0.390625 0.390625 0.390625 2.734375 -0.390625 1.953125 1.953125 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.953125 0.390625 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="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 147.639 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 185.277 190.0 195.0 200.0 205.0 210.0 215.0 220.0 222.916 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 476.26 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</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 0.318 0.296 0.267 0.227 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.219 0.24 0.26 0.281 0.301 0.322 0.342 0.354 0.373 0.42 0.471 0.526 0.584 0.647 0.715 0.787 0.866 0.949 1.039 1.136 1.238 1.348 1.464 1.588 1.718 1.855 2.0 2.151 2.308 2.472 2.642 2.816 2.996 3.18 3.367 3.557 3.749 3.942 4.135 4.327 4.518 4.706 4.89 5.069 5.243 5.41 5.569 5.72 5.861 5.992 6.112 6.22 6.316 6.398 6.467 6.522 6.562 6.588 6.6 6.6 6.598 6.589 6.573 6.551 6.522 6.488 6.449 6.404 6.355 6.302 6.244 6.183 6.118 6.051 5.98 5.908 5.833 5.755 5.677 5.596 5.515 5.432 5.348 5.264 5.179 5.094 5.008 4.922 4.837 4.751 4.666 4.581 4.496 4.412 4.329 4.246 4.164 4.082 4.002 3.922 3.844 3.766 3.689 3.614 3.539 3.465 3.393 3.322 3.251 3.182 3.114 3.047 2.982 2.917 2.854 2.792 2.731 2.671 2.612 2.554 2.497 2.442 2.387 2.334 2.282 2.231 2.18 2.131 2.083 2.036 1.99 1.945 1.9 1.857 1.815 1.773 1.733 1.693 1.654 1.616 1.579 1.543 1.507 1.473 1.439 1.405 1.373 1.341 1.31 1.28 1.25 1.221 1.193 1.165 1.138 1.112 1.086 1.061 1.036 1.012 0.988 0.965 0.943 0.921 0.899

</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="6.6" PeakHeight="476.26" Num="5" zHalfNm="388.956" Error="3.38">
-253.543 0.166 -0.762 0.614 0.181
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="112.916" Depth="0.154"/>
<TopsideChapman PeakHeight="476.26" PeakDensity="540446.6" PeakScaleHeight="65.734" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
