<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 13:50:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp</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" >
2026.04.03 (093) 13:50:00</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">
FF202609304031350009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="12.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.640" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="33.263" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.050" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.310" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="220.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="220.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="101.084" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="96.137" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="5.986" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.345" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.339" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="349.361" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="261.976" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.843" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="115.024" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="56.067" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="63.964" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="155.640" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.110" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="160">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 12.4 12.45 12.5 12.55 12.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
220.000 225.000 230.000 235.000 240.000 245.000 247.500 250.000 255.000 260.000 265.000 266.842 268.684 270.526 272.368 274.211 276.053 277.895 279.737 281.579 283.421 285.263 287.105 288.947 290.789 292.632 294.474 296.316 298.158 300.000 305.000 305.000 307.500 310.000 315.000 312.500 310.000 315.000 315.000 315.000 315.833 316.667 317.500 318.333 319.167 320.000 320.000 320.000 325.000 326.500 328.000 329.500 331.000 332.500 334.000 335.500 337.000 338.500 340.000 341.667 343.333 345.000 345.000 345.000 347.500 350.000 352.500 355.000 355.000 355.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 370.000 370.000 370.000 372.500 375.000 375.000 380.000 382.000 384.000 386.000 388.000 390.000 390.000 390.000 392.500 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 406.667 408.333 410.000 410.000 410.000 415.000 415.000 415.000 417.500 420.000 422.500 425.000 425.000 425.000 425.000 425.000 425.000 425.000 425.000 425.000 425.000 425.000 427.500 430.000 432.200 434.400 436.600 438.800 441.000 443.200 445.400 447.600 449.800 452.000 454.200 456.400 458.600 460.800 463.000 465.200 467.400 469.600 471.800 474.000 476.200 478.400 480.600 482.800 485.000 490.000 490.000 495.000 499.103 504.093 510.294 518.206 528.653 543.083 564.312
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 0 0 45 45 0 45 48 48 48 0 48 0 48 0 0 0 0 0 0 48 0 54 0 0 57 0 0 48 57 57 0 60 0 0 60 63 0 66 0 0 0 0 0 63 60 51 63 0 0 0 0 0 57 0 0 0 57 0 0 57 57 60 0 54 0 48 54 66 51 54 0 66 66 69 72 60 66 72 57 60 66 54 0 0 0 0 48 57 60 54 63 63 54 57 63 48 54 57 57 0 0 57 57 57 57 0 60 0 54 0 45 48 51 0 57 54 0 51 0 57 42 0 51 0 0 0 0 0 0 48 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 57 51 54 51 45 51 51 45 54 45 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -0.390625 -1.171875 -2.734375 -0.390625 1.171875 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 1.953125 0.390625 -2.734375 2.734375 -2.734375 -0.390625 -0.390625 -1.953125 0.390625 1.953125 0.390625 -0.390625 2.734375 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 1.953125 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 -1.171875 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 -0.390625 0.390625 1.953125 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 1.171875 -1.171875 1.171875 -1.953125 -1.953125 1.953125 -2.734375 -1.171875 -1.953125 -0.390625 0.390625 -0.390625 -1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="6">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.05 3.1 3.15 3.2 3.25 3.3
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
101.084 101.759 102.504 103.338 104.286 105.387
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 51 0 51 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 1.953125 0.390625 -2.734375 -0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 96.137 97.874 99.61 100.0 101.347 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 349.361 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 3.248 3.31 3.189 3.189 3.216 3.31 3.414 3.555 3.694 3.833 3.972 4.113 4.256 4.4 4.547 4.696 4.848 5.004 5.162 5.324 5.489 5.657 5.829 6.005 6.184 6.366 6.552 6.742 6.935 7.131 7.331 7.534 7.741 7.951 8.164 8.38 8.599 8.821 9.046 9.274 9.505 9.739 9.976 10.215 10.456 10.7 10.944 11.189 11.432 11.672 11.904 12.121 12.315 12.471 12.571 12.6 12.6 12.591 12.567 12.53 12.481 12.419 12.346 12.263 12.171 12.069 11.959 11.841 11.716 11.585 11.448 11.307 11.16 11.009 10.855 10.698 10.538 10.376 10.212 10.046 9.88 9.712 9.544 9.376 9.208 9.04 8.873 8.706 8.541 8.376 8.212 8.05 7.89 7.731 7.574 7.418 7.265 7.114 6.964 6.817 6.672 6.529 6.388 6.249 6.113 5.979 5.847 5.718 5.591 5.466 5.344 5.224 5.106 4.99 4.877 4.766 4.657 4.551 4.446 4.344 4.244 4.145 4.049 3.955 3.863 3.773 3.685 3.599 3.515 3.433 3.352 3.273 3.196 3.121 3.047 2.975 2.905 2.836 2.769 2.703 2.639 2.576 2.515 2.455 2.397 2.34 2.284 2.23 2.176 2.124 2.074 2.024 1.976 1.928 1.882 1.837 1.793 1.75 1.708 1.667 1.627 1.588 1.55 1.513 1.477 1.441 1.407 1.373 1.34 1.308 1.276 1.246 1.216 1.186 1.158 1.13 1.103 1.076 1.05 1.025 1.0 0.976 0.953 0.93 0.907 0.886 0.864

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.31" PeakHeight="96.137" Num="3" Error="1.966">
-9.111 3.91 -0.936
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.31" EndFrequency="12.6" PeakHeight="349.361" Num="5" zHalfNm="261.976" Error="2.506">
-192.927 -69.106 15.896 -2.977 1.1
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.21" Depth="0.121"/>
<TopsideChapman PeakHeight="349.361" PeakDensity="1969727.0" PeakScaleHeight="63.964" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
