<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-27 -058 18:50:00.000"
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="1 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o 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" >
2026.02.27 (058) 18:50:00</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">
FF202605802271850009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="10.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.662" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.557" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.600" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.000" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.960" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="235.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="235.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="95.150" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="100.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="98.015" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="7.840" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="470.000" 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="2.839" 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="/" />
<URSI ID="92" Val="340.139" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="241.747" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.599" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.000" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="127.868" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="40.869" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="70.124" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="161.870" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.300" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="124">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
235.000 240.000 242.500 245.000 247.500 250.000 252.500 255.000 257.500 260.000 265.000 265.000 266.429 267.857 269.286 270.714 272.143 273.571 275.000 280.000 280.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 297.500 300.000 300.000 300.000 300.000 300.000 300.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 320.000 320.000 325.000 325.000 330.000 331.667 333.333 335.000 335.000 340.000 340.000 345.000 345.000 345.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 370.000 375.000 375.000 375.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 435.000 435.000 440.000 440.000 445.000 445.000 445.000 450.000 450.000 455.000 455.000 455.000 460.000 460.000 465.000 465.000 465.000 465.000 470.000 470.000 470.000 475.000 478.973 483.652 489.244 496.046 504.497 515.281 529.516 549.177 578.095
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 0 48 0 0 0 0 0 0 57 57 0 0 0 0 0 0 57 0 57 48 0 51 0 57 0 0 0 0 0 0 66 0 63 69 72 69 66 48 60 57 63 60 60 0 57 60 60 57 57 57 0 0 57 63 60 60 54 66 69 69 60 63 54 66 75 72 78 72 60 69 75 69 57 66 57 63 57 69 66 72 69 72 66 57 60 54 66 66 75 72 78 72 75 69 72 63 63 60 51 60 57 60 45 54 54 54 54 57 54 60 63 66 69 0 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 2.734375 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 2.734375 -2.734375 -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 -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 -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 -1.171875 -1.171875 0.390625 2.734375 -2.734375 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="20">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
95.150 95.475 95.819 96.182 96.567 96.974 97.408 97.871 98.366 98.899 99.474 100.099 100.784 101.542 102.389 103.353 104.472 105.812 107.498 109.801
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 63 0 63 0 0 54 54 57 0 63 0 0 51 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 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="13">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 100.000 105.000 105.000 105.000 110.000 110.833 111.667 112.500 113.333 114.167 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 66 51 0 48 51 0 0 0 0 0 48 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 -1.953125 -2.734375 -1.953125 -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 98.015 100.0 101.965 105.0 105.914 109.864 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 340.139 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.729 2.96 2.928 2.833 2.833 2.833 2.96 2.964 3.096 3.228 3.361 3.496 3.634 3.776 3.921 4.071 4.226 4.385 4.549 4.718 4.89 5.065 5.244 5.424 5.607 5.79 5.975 6.159 6.344 6.527 6.711 6.893 7.075 7.256 7.435 7.614 7.792 7.969 8.146 8.322 8.497 8.671 8.845 9.018 9.19 9.361 9.529 9.693 9.852 10.002 10.137 10.247 10.322 10.35 10.35 10.345 10.331 10.307 10.274 10.233 10.183 10.127 10.063 9.993 9.916 9.834 9.747 9.655 9.558 9.458 9.353 9.245 9.135 9.021 8.905 8.787 8.668 8.546 8.424 8.3 8.175 8.05 7.925 7.799 7.673 7.547 7.421 7.296 7.171 7.046 6.923 6.8 6.678 6.557 6.437 6.319 6.201 6.085 5.97 5.856 5.744 5.633 5.524 5.416 5.31 5.205 5.102 5.0 4.9 4.802 4.705 4.609 4.515 4.423 4.333 4.243 4.156 4.07 3.986 3.903 3.821 3.741 3.663 3.586 3.51 3.436 3.364 3.293 3.223 3.154 3.087 3.021 2.957 2.894 2.832 2.771 2.712 2.653 2.596 2.54 2.486 2.432 2.379 2.328 2.278 2.228 2.18 2.133 2.087 2.041 1.997 1.953 1.911 1.869 1.829 1.789 1.75 1.712 1.674 1.638 1.602 1.567 1.533 1.499 1.466 1.434 1.403 1.372 1.342 1.313 1.284 1.256 1.228 1.201 1.175 1.149 1.124 1.099 1.075 1.052 1.029 1.006 0.984 0.962 0.941 0.921 0.9

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.96" PeakHeight="98.015" Num="3" Error="1.09">
-11.823 4.96 -1.152
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.96" EndFrequency="10.35" PeakHeight="340.139" Num="5" zHalfNm="241.747" Error="3.161">
-191.127 -52.658 18.966 -7.514 2.058
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="11.849" Depth="0.127"/>
<TopsideChapman PeakHeight="340.139" PeakDensity="1329063.2" PeakScaleHeight="70.124" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
