<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 12:00:00.000"
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 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" >
2026.02.21 (052) 12:00:00</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">
FF202605202211200009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="9.650" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.545" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.558" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.300" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.000" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.160" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="320.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="320.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="96.097" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="121.250" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="92.868" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="5.088" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.950" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="485.000" 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="2.990" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.169" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="342.599" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="221.913" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.096" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.200" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="155.330" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="42.991" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="86.309" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="195.620" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.380" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="73">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
320.000 320.000 320.000 320.000 321.667 323.333 325.000 325.000 330.000 332.143 334.286 336.429 338.571 340.714 342.857 345.000 345.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 370.000 375.000 380.000 380.000 385.000 385.000 385.000 390.000 395.000 400.000 400.000 410.000 410.000 415.000 420.000 425.000 425.000 435.000 435.000 440.000 445.000 445.000 450.000 455.000 460.000 460.000 470.000 475.000 475.000 480.000 480.000 485.000 485.000 495.000 500.000 505.000 505.000 510.000 515.000 521.236 528.591 537.396 548.125 561.489 578.591 601.257 632.730
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 48 48 0 0 48 45 51 0 0 0 0 0 0 51 54 48 54 51 51 51 48 51 51 54 54 51 45 54 51 57 57 57 60 60 60 60 60 63 63 57 54 60 63 63 60 63 54 60 63 63 60 54 60 57 60 60 60 60 57 54 60 60 60 54 51 57 57 54 51 48 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 0.390625 0.390625 -1.171875 1.171875 0.390625 1.171875 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.0 3.05 3.1 3.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
96.097 97.774 100.068 103.842
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 66 69 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="43">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 98.750 97.500 96.250 95.000 96.944 98.889 100.833 102.778 104.722 106.667 108.611 110.556 112.500 114.444 116.389 118.333 120.278 122.222 124.167 126.111 128.056 130.000 130.000 129.286 128.571 127.857 127.143 126.429 125.714 125.000 125.000 130.000 128.333 126.667 125.000 123.750 122.500 121.250 120.000 125.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 54 0 0 0 0 0 0 0 0 54 45 0 0 57 0 0 0 45 60 48 45
</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 -2.734375 0.390625 0.390625 1.171875 -0.390625 -0.390625 1.171875 -0.390625 2.734375 1.953125 2.734375 -2.734375 2.734375 -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 -1.171875 0.390625 0.390625 0.390625 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
87.657 90.0 92.868 95.0 96.129 99.389 100.0 102.65 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 342.599 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.612 3.16 3.105 3.031 3.031 3.055 3.16 3.242 3.409 3.568 3.723 3.877 4.03 4.183 4.336 4.49 4.643 4.798 4.952 5.106 5.26 5.414 5.568 5.721 5.873 6.024 6.175 6.324 6.473 6.621 6.768 6.914 7.058 7.203 7.346 7.488 7.629 7.77 7.909 8.047 8.185 8.321 8.456 8.589 8.72 8.849 8.974 9.095 9.21 9.318 9.417 9.502 9.571 9.621 9.647 9.65 9.649 9.643 9.631 9.613 9.59 9.561 9.528 9.489 9.446 9.399 9.348 9.292 9.233 9.171 9.105 9.036 8.965 8.89 8.814 8.735 8.654 8.571 8.486 8.4 8.312 8.223 8.133 8.041 7.949 7.856 7.763 7.668 7.574 7.479 7.384 7.288 7.193 7.097 7.002 6.907 6.812 6.717 6.623 6.529 6.435 6.342 6.25 6.158 6.067 5.977 5.887 5.798 5.709 5.622 5.535 5.449 5.364 5.28 5.197 5.115 5.033 4.953 4.873 4.795 4.717 4.641 4.565 4.49 4.416 4.344 4.272 4.201 4.131 4.062 3.994 3.927 3.861 3.796 3.732 3.669 3.607 3.546 3.485 3.426 3.367 3.31 3.253 3.197 3.142 3.088 3.035 2.982 2.93 2.88 2.83 2.781 2.732 2.685 2.638 2.592 2.547 2.502 2.458 2.415 2.373 2.331 2.29 2.25 2.211 2.172 2.133 2.096 2.059 2.023 1.987 1.952 1.917 1.883 1.85 1.817 1.785 1.753 1.722 1.692 1.662 1.632 1.603 1.575 1.547 1.519 1.492 1.466

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.16" PeakHeight="92.868" Num="3" Error="0.392">
-7.715 3.28 -0.776
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.16" EndFrequency="9.65" PeakHeight="342.599" Num="5" zHalfNm="221.913" Error="2.768">
-213.518 -42.327 19.914 -5.399 1.381
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.782" Depth="0.129"/>
<TopsideChapman PeakHeight="342.599" PeakDensity="1155366.0" PeakScaleHeight="86.309" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
