<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 21:50:00.000"
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 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" >
2026.04.05 (095) 21:50:00</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">
FF202609504052150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="9.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.581" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.519" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.650" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="370.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="370.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" Name="h`Es" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="497.481" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.363" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="418.989" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="355.303" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.405" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.500" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="94.524" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="22.928" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="47.495" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="98.680" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.690" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="99">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.3 9.35 9.4 9.45 9.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
370.000 370.000 375.000 375.000 375.000 375.000 375.000 376.250 377.500 378.750 380.000 380.000 381.667 383.333 385.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 390.000 392.500 395.000 396.667 398.333 400.000 400.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 410.000 410.000 415.000 416.667 418.333 420.000 420.000 420.000 420.000 422.500 425.000 425.000 425.000 425.000 430.000 432.500 435.000 435.000 435.000 435.000 440.000 440.000 440.000 445.000 445.000 445.000 445.000 450.000 450.000 455.000 455.000 455.000 460.000 460.000 465.000 465.000 467.500 470.000 470.000 475.000 475.000 480.000 480.000 485.000 487.500 490.000 490.000 495.000 497.481 500.379 503.809 507.932 512.982 519.309 527.471 538.399 553.788 577.068
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 63 60 63 63 51 54 0 0 0 54 57 0 0 60 0 0 57 57 66 60 54 57 63 0 54 0 0 54 0 60 0 0 54 51 0 63 60 0 0 57 57 63 54 0 0 54 0 63 60 0 63 72 72 66 57 0 60 66 72 72 60 66 69 66 75 78 78 78 87 78 72 66 69 69 60 69 0 54 63 63 69 51 57 54 0 51 66 51 0 54 45 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 -1.171875 -0.390625 -1.171875 -1.171875 -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 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -2.734375 -0.390625 2.734375 1.171875 2.734375 1.171875 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="44">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 100.000 103.750 107.500 111.250 115.000 117.500 120.000 125.000 121.667 118.333 115.000 105.000 107.500 110.000 110.000 107.500 105.000 102.500 100.000 102.500 105.000 105.000 105.000 100.000 100.000 115.000 100.000 100.000 105.000 105.625 106.250 106.875 107.500 108.125 108.750 109.375 110.000 110.000 102.500 95.000 100.000 100.000 100.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 57 0 0 0 57 0 63 60 0 0 63 66 0 63 60 0 0 0 63 0 66 57 66 63 63 51 66 57 0 0 0 0 0 0 0 0 51 51 0 51 48 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 1.171875 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 -1.171875 -2.734375 0.390625 0.390625 1.171875 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" >
93.304 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.883 140.0 145.0 150.0 155.0 160.0 165.0 169.765 170.0 175.0 180.0 185.0 190.0 195.0 199.648 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 418.989 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 0.314 0.351 0.363 0.359 0.349 0.33 0.301 0.26 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.201 0.229 0.256 0.283 0.31 0.338 0.363 0.367 0.434 0.508 0.59 0.683 0.786 0.901 1.028 1.167 1.317 1.48 1.653 1.837 2.03 2.232 2.443 2.661 2.888 3.121 3.362 3.609 3.863 4.123 4.39 4.662 4.94 5.223 5.51 5.803 6.099 6.398 6.699 7.001 7.303 7.601 7.894 8.178 8.449 8.703 8.933 9.132 9.295 9.414 9.483 9.5 9.5 9.486 9.453 9.402 9.336 9.254 9.159 9.053 8.935 8.808 8.672 8.529 8.38 8.225 8.066 7.903 7.738 7.57 7.4 7.23 7.059 6.889 6.718 6.549 6.381 6.215 6.05 5.888 5.728 5.57 5.415 5.263 5.113 4.967 4.823 4.683 4.545 4.411 4.28 4.152 4.028 3.906 3.788 3.673 3.56 3.451 3.345 3.241 3.141 3.043 2.949 2.857 2.767 2.68 2.596 2.514 2.435 2.358 2.283 2.211 2.141 2.073 2.007 1.943 1.881 1.821 1.763 1.707 1.652 1.599 1.548 1.498 1.45 1.404 1.359 1.315 1.273 1.232 1.192 1.154 1.117 1.081 1.046 1.012 0.979 0.948 0.917 0.888 0.859 0.831 0.805 0.779 0.753 0.729 0.706 0.683 0.661 0.639 0.619 0.599 0.579 0.561 0.542 0.525 0.508 0.492 0.476 0.46 0.445 0.431 0.417 0.404 0.391 0.378 0.366 0.354 0.342

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.363" PeakHeight="110.0" Num="3" Error="0.0">
-19.108 2.567 -0.155
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.363" EndFrequency="9.5" PeakHeight="418.989" Num="5" zHalfNm="355.303" Error="1.212">
-210.483 -19.125 14.937 -6.013 1.343
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="89.648" Depth="0.163"/>
<TopsideChapman PeakHeight="418.989" PeakDensity="1119727.0" PeakScaleHeight="47.495" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
