<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-17 -076 18:00:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x 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" >
2026.03.17 (076) 18:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607603171800009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.589" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.925" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.800" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.860" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="230.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="109.472" Name="h`E" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="480.000" 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="3.065" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.206" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="352.162" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="256.716" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.394" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="124.853" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="40.496" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="68.538" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="160.430" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.250" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="125">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
230.000 235.000 240.000 245.000 250.000 252.500 255.000 255.000 260.000 270.000 270.000 275.000 275.000 280.000 280.000 280.000 290.000 290.000 290.000 295.000 295.000 300.000 305.000 306.667 308.333 310.000 310.000 311.429 312.857 314.286 315.714 317.143 318.571 320.000 320.000 325.000 325.000 330.000 325.000 327.500 330.000 332.500 335.000 335.000 336.667 338.333 340.000 341.667 343.333 345.000 345.000 345.000 345.000 350.000 351.429 352.857 354.286 355.714 357.143 358.571 360.000 365.000 366.667 368.333 370.000 371.667 373.333 375.000 376.667 378.333 380.000 385.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 405.000 408.333 411.667 415.000 420.000 420.000 420.000 425.000 425.000 430.000 430.000 435.000 435.000 437.500 440.000 440.000 445.000 445.000 450.000 450.000 455.000 457.500 460.000 460.000 465.000 465.000 470.000 470.000 475.000 480.000 480.000 485.000 490.000 495.000 500.000 505.000 510.000 515.000 520.000 525.000 533.729 544.011 556.300 571.246
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 0 0 54 0 57 48 48 48 54 51 54 51 54 54 48 45 45 51 51 0 51 0 0 54 54 0 0 0 0 51 0 60 51 63 66 63 54 0 0 0 63 63 0 0 0 0 0 0 0 51 45 0 0 0 0 0 0 0 57 60 0 45 0 0 0 0 51 0 66 66 57 69 75 66 75 66 72 63 63 51 0 0 57 51 57 60 57 66 63 72 63 69 57 66 66 63 63 57 63 51 0 60 66 57 66 60 66 69 60 60 60 60 57 54 54 57 54 57 51 51 51 48 42
</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 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 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 -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 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>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.8 2.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
109.472 110.812
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 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" >
89.57 90.0 95.0 100.0 105.0 110.0 112.928 115.0 115.856 118.784 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 352.162 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.235 1.922 2.476 2.767 2.86 2.746 2.746 2.746 2.86 2.894 3.032 3.169 3.306 3.444 3.585 3.728 3.874 4.023 4.175 4.331 4.49 4.652 4.817 4.985 5.155 5.327 5.501 5.677 5.853 6.031 6.21 6.389 6.569 6.749 6.93 7.111 7.292 7.473 7.654 7.836 8.017 8.199 8.381 8.563 8.745 8.927 9.109 9.289 9.468 9.644 9.815 9.977 10.125 10.252 10.346 10.395 10.4 10.398 10.387 10.366 10.335 10.295 10.247 10.191 10.127 10.056 9.979 9.895 9.806 9.712 9.613 9.51 9.403 9.292 9.179 9.062 8.943 8.821 8.698 8.573 8.447 8.32 8.191 8.063 7.933 7.804 7.674 7.545 7.416 7.287 7.159 7.031 6.904 6.779 6.654 6.53 6.407 6.286 6.166 6.047 5.93 5.814 5.699 5.587 5.475 5.365 5.257 5.151 5.046 4.943 4.841 4.741 4.643 4.546 4.451 4.358 4.266 4.176 4.088 4.001 3.916 3.832 3.75 3.67 3.591 3.514 3.438 3.364 3.291 3.219 3.149 3.081 3.014 2.948 2.883 2.82 2.758 2.698 2.638 2.58 2.523 2.468 2.413 2.36 2.308 2.257 2.207 2.158 2.11 2.063 2.017 1.972 1.928 1.885 1.843 1.802 1.762 1.723 1.684 1.647 1.61 1.574 1.539 1.504 1.471 1.438 1.406 1.374 1.343 1.313 1.284 1.255 1.227 1.199 1.173 1.146 1.121 1.095 1.071 1.047 1.023 1.0 0.978 0.956 0.934 0.913 0.893

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.86" PeakHeight="110.0" Num="3" Error="0.0">
-30.075 12.526 -2.881
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.86" EndFrequency="10.4" PeakHeight="352.162" Num="5" zHalfNm="256.716" Error="3.537">
-192.625 -55.424 18.99 -5.905 1.586
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.784" Depth="0.114"/>
<TopsideChapman PeakHeight="352.162" PeakDensity="1341935.5" PeakScaleHeight="68.538" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
