<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 23:30:00.000"
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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: Multiple candidates for F2x 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" >
2026.04.03 (093) 23:30:00</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">
FF202609304032330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.449" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.550" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="300.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="300.000" 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="0.600" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="550.000" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="432.923" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="349.982" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.267" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="120.855" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="24.819" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="61.247" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="115.000" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.320" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="127">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
300.000 305.000 305.000 305.556 306.111 306.667 307.222 307.778 308.333 308.889 309.444 310.000 310.000 312.222 314.444 316.667 318.889 321.111 323.333 325.556 327.778 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 340.000 341.000 342.000 343.000 344.000 345.000 345.000 350.000 350.000 350.000 352.500 355.000 355.000 360.000 360.000 361.250 362.500 363.750 365.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 400.000 402.000 404.000 406.000 408.000 410.000 415.000 415.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 435.000 435.000 440.000 445.000 447.500 450.000 450.000 455.000 460.000 460.000 460.000 461.667 463.333 465.000 466.667 468.333 470.000 490.000 485.000 490.000 490.000 490.000 495.000 515.000 517.500 520.000 521.667 523.333 525.000 530.000 530.000 535.000 540.000 540.000 540.000 545.000 550.000 558.325 568.041 579.529 593.322 610.192 631.297
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 66 72 0 0 0 0 0 0 0 0 69 69 0 0 60 0 0 0 0 0 51 54 54 0 60 57 0 0 0 57 51 0 0 60 0 60 69 66 69 66 63 66 63 54 60 0 54 0 63 69 69 69 69 63 69 60 0 63 57 63 57 66 69 57 63 66 57 60 66 0 0 0 0 63 54 69 72 72 69 69 69 66 66 60 57 63 57 0 63 60 0 57 51 57 0 51 0 0 0 60 54 54 57 57 63 63 63 0 60 57 54 57 63 60 54 57 48 54 57 51 0 60 63 45 0 54
</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 -2.734375 0.390625 0.390625 1.171875 0.390625 0.390625 0.390625 -1.171875 0.390625 -2.734375 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 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 1.171875 0.390625 -1.953125 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 1.171875 1.171875 1.171875 2.734375 1.171875 1.171875 2.734375 2.734375 1.171875 1.171875 2.734375 1.171875 -1.953125 1.171875 1.171875 1.171875 2.734375 1.171875 1.171875 1.171875 1.171875 1.171875 2.734375 2.734375 2.734375 2.734375 2.734375 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 1.171875 -1.171875 1.171875 1.171875 1.953125 2.734375 1.953125
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.186 150.0 155.0 160.0 165.0 170.0 175.0 180.0 180.373 185.0 190.0 195.0 200.0 205.0 210.0 215.0 215.559 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 432.923 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.331 0.313 0.287 0.252 0.202 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.22 0.242 0.264 0.286 0.308 0.33 0.352 0.354 0.433 0.504 0.574 0.649 0.733 0.83 0.943 1.079 1.245 1.449 1.694 1.978 2.286 2.605 2.923 3.235 3.54 3.836 4.125 4.406 4.682 4.952 5.216 5.475 5.729 5.979 6.223 6.463 6.697 6.925 7.146 7.36 7.565 7.761 7.945 8.117 8.273 8.413 8.535 8.635 8.713 8.767 8.796 8.8 8.799 8.789 8.768 8.737 8.697 8.648 8.591 8.526 8.454 8.375 8.291 8.201 8.106 8.007 7.904 7.797 7.687 7.575 7.46 7.343 7.225 7.105 6.984 6.862 6.74 6.617 6.494 6.372 6.25 6.128 6.007 5.886 5.767 5.648 5.531 5.415 5.3 5.187 5.075 4.964 4.855 4.748 4.642 4.538 4.436 4.336 4.237 4.14 4.044 3.951 3.859 3.769 3.681 3.594 3.509 3.426 3.345 3.265 3.187 3.111 3.036 2.963 2.891 2.821 2.753 2.686 2.621 2.557 2.495 2.434 2.374 2.316 2.259 2.203 2.149 2.096 2.044 1.994 1.945 1.897 1.85 1.804 1.759 1.715 1.673 1.631 1.591 1.551 1.512 1.475 1.438 1.402 1.367 1.333 1.3 1.267 1.235 1.205 1.174 1.145 1.116 1.088 1.061 1.035 1.009 0.983 0.959 0.935 0.911 0.888 0.866 0.844 0.823 0.802

</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="8.8" PeakHeight="432.923" Num="5" zHalfNm="349.982" Error="6.528">
-232.058 15.894 1.931 -8.554 5.423
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="105.559" Depth="0.154"/>
<TopsideChapman PeakHeight="432.923" PeakDensity="960794.06" PeakScaleHeight="61.247" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
