<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-27 -058 11:10:00.000"
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 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" >
2026.02.27 (058) 11:10:00</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">
FF202605802271110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="10.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.957" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.609" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.100" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.300" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.760" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="225.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="225.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="108.563" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="116.667" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="102.498" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="12.246" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="385.000" 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="2.720" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="304.532" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="228.000" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.047" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.800" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="105.446" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="33.671" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="58.586" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="111.990" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.960" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="137">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 227.500 230.000 230.000 230.000 230.000 230.000 230.000 230.000 230.000 230.000 233.333 236.667 240.000 240.000 240.000 240.000 240.000 241.667 243.333 245.000 250.000 250.000 255.000 255.000 255.000 255.000 260.000 260.000 260.000 260.000 260.000 260.000 261.667 263.333 265.000 266.667 268.333 270.000 270.000 270.000 270.000 275.000 270.000 272.500 275.000 275.000 275.000 275.000 276.667 278.333 280.000 281.667 283.333 285.000 285.000 285.000 285.000 285.000 285.000 286.316 287.632 288.947 290.263 291.579 292.895 294.211 295.526 296.842 298.158 299.474 300.789 302.105 303.421 304.737 306.053 307.368 308.684 310.000 310.000 310.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 345.000 350.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 385.000 385.000 390.000 395.000 400.000 400.000 405.000 415.000 420.000 425.000 435.000 448.965 468.254 496.627 542.483
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 48 0 0 0 0 0 45 0 48 0 0 54 57 54 63 60 0 0 60 63 63 57 0 0 57 60 60 63 63 63 63 0 0 0 0 0 66 66 66 63 0 57 0 0 0 60 54 0 0 0 0 0 0 0 63 0 63 0 0 0 0 0 0 0 0 0 0 0 0 0 0 57 0 45 69 0 60 63 69 60 66 69 72 54 60 63 66 63 60 66 69 72 69 72 72 72 66 66 66 63 66 63 63 66 51 57 60 60 63 66 63 69 57 63 66 60 63 60 60 60 60 63 60 57 51 57 57 54 54 54 54 51 48 48 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -1.171875 -0.390625 1.171875 -0.390625 0.390625 -0.390625 0.390625 1.953125 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 -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 1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="10">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
108.563 109.141 109.769 110.457 111.218 112.070 113.039 114.164 115.512 117.205
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 0 57 0 0 0 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 2.734375 0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.8 2.85 2.9 2.95 3.0 3.05 3.1
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
116.667 118.333 120.000 120.000 120.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 54 60 60 0 60
</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
</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 95.0 100.0 102.498 105.0 107.005 110.0 111.512 115.0 116.019 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 304.532 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.188 2.701 2.76 2.722 2.635 2.635 2.635 2.732 2.76 2.869 3.004 3.141 3.279 3.42 3.566 3.717 3.874 4.039 4.211 4.392 4.583 4.784 4.997 5.222 5.46 5.711 5.974 6.25 6.537 6.833 7.135 7.441 7.748 8.051 8.348 8.634 8.907 9.163 9.4 9.615 9.806 9.971 10.107 10.215 10.292 10.337 10.35 10.35 10.341 10.319 10.283 10.236 10.177 10.107 10.027 9.939 9.842 9.737 9.626 9.508 9.385 9.257 9.124 8.988 8.848 8.706 8.561 8.414 8.266 8.116 7.966 7.815 7.665 7.514 7.364 7.214 7.065 6.917 6.77 6.625 6.481 6.338 6.197 6.058 5.921 5.786 5.653 5.522 5.393 5.267 5.142 5.02 4.9 4.782 4.667 4.553 4.442 4.334 4.227 4.123 4.021 3.921 3.823 3.728 3.635 3.543 3.454 3.367 3.282 3.199 3.117 3.038 2.961 2.885 2.811 2.739 2.669 2.6 2.534 2.468 2.405 2.343 2.282 2.223 2.166 2.11 2.055 2.002 1.95 1.899 1.85 1.801 1.754 1.709 1.664 1.621 1.579 1.537 1.497 1.458 1.42 1.383 1.347 1.312 1.277 1.244 1.211 1.179 1.149 1.118 1.089 1.061 1.033 1.006 0.979 0.954 0.929 0.904 0.881 0.857 0.835 0.813 0.792 0.771 0.751 0.731 0.712 0.693 0.675 0.657 0.64 0.623 0.607 0.591 0.575 0.56 0.545 0.531 0.517 0.503 0.49 0.477 0.465 0.452 0.441 0.429 0.418

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.76" PeakHeight="102.498" Num="3" Error="4.568">
-18.357 7.587 -1.728
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.76" EndFrequency="10.35" PeakHeight="304.532" Num="5" zHalfNm="228.0" Error="1.717">
-163.369 -22.547 -4.38 1.075 0.708
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="13.521" Depth="0.125"/>
<TopsideChapman PeakHeight="304.532" PeakDensity="1329063.2" PeakScaleHeight="58.586" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
