<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 16:30:00.000"
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="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: 95% PACIFIC flags: Multiple candidates for F2x 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" >
2026.02.28 (059) 16:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605902281630009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="12.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.546" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.718" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.450" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.450" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.910" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="335.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="335.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="98.781" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="96.313" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="6.178" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.000" 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="3.335" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.335" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="377.613" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="278.424" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.918" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="136.009" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="67.434" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="74.890" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="176.630" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.160" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="134">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 12.65 12.7 12.75 12.8 12.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
335.000 335.000 335.000 340.000 340.000 340.000 340.000 341.875 343.750 345.625 347.500 349.375 351.250 353.125 355.000 355.000 356.053 357.105 358.158 359.211 360.263 361.316 362.368 363.421 364.474 365.526 366.579 367.632 368.684 369.737 370.789 371.842 372.895 373.947 375.000 375.000 378.333 381.667 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 410.000 412.500 415.000 415.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 425.000 425.000 425.000 425.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 435.000 435.000 440.000 440.000 440.000 440.000 440.000 440.000 445.000 447.500 450.000 450.714 451.429 452.143 452.857 453.571 454.286 455.000 455.000 455.000 458.333 461.667 465.000 468.333 471.667 475.000 475.000 477.500 480.000 485.000 487.500 490.000 490.000 490.000 490.000 500.000 505.000 510.000 515.000 515.000 525.000 530.000 535.000 540.000 547.496 555.896 565.375 576.156 588.526 602.864 619.681 639.681
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 54 48 0 54 54 0 0 0 48 0 48 0 54 57 0 0 0 0 54 0 0 0 0 0 48 0 0 0 0 0 0 0 60 54 0 0 54 54 57 60 60 57 60 63 63 63 63 0 60 66 54 60 63 0 63 60 0 51 60 63 63 0 0 54 63 63 57 0 60 60 51 51 54 0 0 57 54 0 51 54 54 54 57 0 0 57 0 48 57 0 54 0 0 0 0 0 0 57 0 57 0 0 0 0 0 45 48 0 48 48 0 51 54 0 51 57 57 57 54 51 54 54 51 51 48 45 45 42 0 0 0 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 2.734375 -0.390625 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 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 -2.734375 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="10">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
98.781 99.250 99.742 100.259 100.805 101.381 101.990 102.636 103.325 104.060
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 51 0 0 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
2.734375 0.390625 0.390625 0.390625 0.390625 1.953125 -0.390625 -1.171875 2.734375 1.171875
</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 96.313 98.09 99.867 100.0 101.644 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 377.613 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.842 2.91 2.803 2.803 2.811 2.91 3.037 3.226 3.412 3.593 3.77 3.942 4.11 4.275 4.437 4.598 4.756 4.914 5.072 5.229 5.386 5.543 5.701 5.861 6.021 6.183 6.346 6.512 6.679 6.849 7.022 7.197 7.375 7.557 7.742 7.931 8.124 8.321 8.523 8.729 8.939 9.155 9.375 9.6 9.829 10.063 10.301 10.541 10.783 11.025 11.266 11.502 11.731 11.949 12.152 12.337 12.498 12.633 12.737 12.808 12.845 12.85 12.849 12.838 12.817 12.786 12.745 12.695 12.637 12.57 12.496 12.415 12.327 12.233 12.133 12.028 11.918 11.803 11.683 11.56 11.434 11.304 11.171 11.036 10.899 10.76 10.619 10.476 10.332 10.188 10.042 9.897 9.75 9.604 9.457 9.311 9.165 9.019 8.874 8.73 8.586 8.444 8.302 8.161 8.022 7.883 7.746 7.611 7.476 7.344 7.212 7.082 6.954 6.828 6.703 6.579 6.457 6.337 6.219 6.103 5.988 5.874 5.763 5.653 5.545 5.439 5.334 5.231 5.13 5.031 4.933 4.837 4.742 4.649 4.558 4.468 4.38 4.294 4.209 4.125 4.043 3.963 3.884 3.807 3.73 3.656 3.583 3.511 3.44 3.371 3.303 3.237 3.171 3.107 3.045 2.983 2.923 2.863 2.805 2.748 2.693 2.638 2.584 2.532 2.48 2.43 2.38 2.332 2.284 2.237 2.192 2.147 2.103 2.06 2.018 1.977 1.936 1.896 1.858 1.82 1.782 1.746 1.71 1.675 1.64 1.607 1.574

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.91" PeakHeight="96.313" Num="3" Error="2.09">
-9.303 3.889 -0.899
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.91" EndFrequency="12.85" PeakHeight="377.613" Num="5" zHalfNm="278.424" Error="3.541">
-234.826 -60.268 17.383 3.665 -1.923
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.331" Depth="0.107"/>
<TopsideChapman PeakHeight="377.613" PeakDensity="2048666.2" PeakScaleHeight="74.89" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
