<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 19:10:00.000"
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 1 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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" >
2026.04.02 (092) 19:10:00</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">
FF202609204021910009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="12.375" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.122" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.417" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.855" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="235.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="285.000" 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="88" Val="10.950" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="2.637" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="395.277" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="205.202" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="288.766" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.318" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="131.266" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="43.264" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="63.050" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="76.069" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="166.700" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.470" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="145">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
290.000 285.000 287.500 290.000 295.000 300.000 300.000 300.000 300.000 305.000 305.000 306.667 308.333 310.000 315.000 315.000 315.000 315.000 317.500 320.000 322.500 325.000 325.000 325.000 327.500 330.000 330.000 335.000 335.000 335.000 335.000 337.500 340.000 342.500 345.000 346.250 347.500 348.750 350.000 350.000 355.000 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 367.500 370.000 370.000 370.000 375.000 377.500 380.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 400.000 405.000 405.000 410.000 410.000 410.000 412.500 415.000 415.000 420.000 420.000 422.500 425.000 425.000 427.500 430.000 435.000 435.000 430.000 432.500 435.000 445.000 445.000 445.000 445.000 445.000 445.000 447.500 450.000 452.500 455.000 457.500 460.000 460.000 462.500 465.000 465.000 466.667 468.333 470.000 480.000 480.000 480.000 485.000 486.667 488.333 490.000 490.000 494.286 498.571 502.857 507.143 511.429 515.714 520.000 520.000 525.000 530.000 535.000 540.000 545.000 545.000 548.750 552.500 556.250 560.000 565.714 571.429 577.143 582.857 591.029 599.857 609.424 619.826 631.178 643.617
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 51 0 0 48 57 60 63 60 63 0 0 63 51 60 66 66 0 63 0 57 0 63 54 60 63 51 57 0 63 0 63 0 57 0 48 0 63 66 54 63 63 54 60 66 66 60 66 54 60 63 69 60 0 54 60 69 54 63 69 57 63 66 57 63 51 60 66 69 66 69 60 66 69 63 69 69 66 69 60 66 69 60 69 54 63 66 57 63 54 57 63 66 57 66 54 63 48 63 0 60 57 0 57 57 0 0 45 54 57 54 54 0 0 51 48 54 0 0 0 45 0 48 48 48 51 51 48 48 54 0 0 0 54 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" >
-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 -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 2.734375 -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 -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 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 2.734375 0.390625 -1.953125 0.390625 1.953125 0.390625 -1.171875 -0.390625 -0.390625 0.390625 -1.953125 2.734375 2.734375 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="32">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
235.000 235.000 240.000 240.000 240.000 240.000 242.500 245.000 250.000 251.667 253.333 255.000 255.000 255.000 255.000 255.000 260.000 265.000 265.000 267.500 270.000 270.000 271.000 272.000 273.000 274.000 275.000 275.000 278.750 282.500 286.250 290.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 51 0 51 51 0 48 45 0 0 45 54 0 0 45 57 0 60 0 57 57 0 0 45 0 57 51 0 0 0 48
</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 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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.612 90.0 95.0 100.0 105.0 110.0 114.906 115.0 119.813 120.0 124.719 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 205.202 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 395.277 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.232 1.771 2.283 2.552 2.637 2.514 2.514 2.514 2.519 2.637 2.645 2.787 2.921 3.054 3.187 3.322 3.461 3.604 3.752 3.906 4.066 4.232 4.406 4.589 4.782 4.982 5.122 5.122 5.386 5.602 5.799 5.99 6.178 6.369 6.564 6.764 6.971 7.186 7.407 7.635 7.867 8.103 8.34 8.575 8.807 9.035 9.258 9.475 9.686 9.891 10.091 10.285 10.475 10.66 10.841 11.018 11.192 11.363 11.529 11.692 11.85 12.0 12.139 12.257 12.341 12.375 12.375 12.37 12.356 12.332 12.298 12.256 12.206 12.148 12.082 12.01 11.931 11.845 11.754 11.658 11.557 11.451 11.341 11.227 11.11 10.99 10.866 10.74 10.612 10.481 10.349 10.215 10.08 9.944 9.806 9.669 9.53 9.392 9.253 9.114 8.975 8.837 8.699 8.561 8.424 8.288 8.152 8.018 7.884 7.752 7.62 7.49 7.361 7.234 7.107 6.982 6.859 6.737 6.616 6.497 6.38 6.264 6.149 6.036 5.925 5.816 5.707 5.601 5.496 5.393 5.291 5.191 5.093 4.996 4.901 4.807 4.715 4.624 4.535 4.448 4.362 4.277 4.194 4.112 4.032 3.953 3.876 3.8 3.726 3.652 3.581 3.51 3.441 3.373 3.306 3.241 3.176 3.113 3.052 2.991 2.931 2.873 2.816 2.76 2.704 2.65 2.597 2.545 2.495 2.445 2.396 2.347 2.3 2.254 2.209 2.165 2.121 2.078 2.037 1.996 1.955 1.916 1.877 1.839 1.802 1.766 1.73 1.695

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.637" PeakHeight="110.0" Num="3" Error="0.0">
-29.858 12.216 -2.746
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="2.637" EndFrequency="5.122" PeakHeight="205.202" Num="5" Error="0.0">
-55.866 -29.365 4.915 -0.437 0.27
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.122" EndFrequency="12.375" PeakHeight="395.277" Num="5" zHalfNm="288.766" Error="5.607">
-161.773 -40.686 16.216 -7.483 3.651
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="14.719" Depth="0.123"/>
<TopsideChapman PeakHeight="395.277" PeakDensity="1900007.8" PeakScaleHeight="76.069" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
