<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 20:40:00.000"
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="2 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 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) 20:40:00</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">
FF202605202212040009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="11.650" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.593" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.211" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.900" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" Name="h`Es" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="520.000" 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="1.799" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="376.981" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="301.869" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.324" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.500" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="105.203" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="39.944" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="53.004" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="126.080" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.250" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="2.850" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="177">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.85 2.9 2.95 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 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 260.000 261.250 262.500 263.750 265.000 265.000 265.000 265.000 260.000 262.500 265.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 275.000 276.667 278.333 280.000 280.000 280.000 285.000 285.909 286.818 287.727 288.636 289.545 290.455 291.364 292.273 293.182 294.091 295.000 295.000 295.000 295.000 298.333 301.667 305.000 305.000 305.000 306.667 308.333 310.000 310.000 315.000 315.000 315.833 316.667 317.500 318.333 319.167 320.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 335.000 336.667 338.333 340.000 341.667 343.333 345.000 346.667 348.333 350.000 350.000 352.500 355.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 367.000 369.000 371.000 373.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 397.500 400.000 400.000 402.500 405.000 407.500 410.000 410.000 415.000 415.000 415.000 415.000 417.500 420.000 420.000 425.000 425.000 425.000 427.500 430.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 435.000 440.000 442.500 445.000 447.500 450.000 450.000 450.000 452.500 455.000 455.000 455.000 457.500 460.000 465.000 465.000 465.000 465.000 467.500 470.000 472.500 475.000 475.000 480.000 480.000 480.000 480.000 482.500 485.000 490.000 492.500 495.000 500.000 501.667 503.333 505.000 510.000 510.000 515.000 520.000 520.000 525.131 530.981 537.715
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 60 0 0 0 63 0 63 69 57 0 72 72 0 72 75 72 0 69 69 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 60 0 0 63 63 0 0 0 57 60 51 57 0 0 0 0 0 60 51 0 60 63 54 63 0 63 57 0 0 0 0 48 0 63 45 57 63 45 57 63 69 69 60 66 66 63 69 69 0 0 0 0 69 69 66 69 69 69 69 63 66 69 63 66 66 63 69 69 66 72 57 63 66 57 60 69 69 63 69 69 63 66 75 0 63 72 75 75 72 69 72 72 69 69 72 0 0 0 57 63 63 51 57 57 60 51 57 45 0 54 57 0 54 0 48 51 42 0 51 51 0 51 48 0 45 42 0 0 48 45 51 48 42 51 45 42 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 -2.734375 -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 -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 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 1.171875 -0.390625 -1.171875 -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 -1.953125 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 0.390625 -0.390625 0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="9">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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" >
115.000 115.000 115.000 113.750 112.500 111.250 110.000 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 54 51 0 0 48 51 54
</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 2.734375 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" >
89.823 90.0 95.0 100.0 105.0 110.0 115.0 119.36 120.0 125.0 128.72 130.0 135.0 138.08 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 376.981 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.215 1.204 1.558 1.741 1.799 1.761 1.662 1.662 1.662 1.662 1.681 1.754 1.799 1.839 1.945 2.054 2.167 2.285 2.409 2.541 2.681 2.831 2.99 3.16 3.341 3.533 3.735 3.947 4.167 4.393 4.624 4.859 5.096 5.334 5.572 5.81 6.048 6.284 6.519 6.754 6.987 7.22 7.453 7.685 7.918 8.151 8.384 8.619 8.854 9.092 9.332 9.574 9.819 10.066 10.317 10.571 10.825 11.077 11.315 11.518 11.638 11.65 11.646 11.625 11.585 11.528 11.455 11.368 11.267 11.154 11.03 10.896 10.752 10.601 10.443 10.279 10.109 9.935 9.757 9.576 9.393 9.207 9.021 8.834 8.646 8.458 8.271 8.085 7.9 7.717 7.535 7.355 7.177 7.001 6.828 6.658 6.49 6.325 6.163 6.003 5.847 5.694 5.544 5.397 5.253 5.112 4.975 4.84 4.709 4.58 4.455 4.333 4.213 4.097 3.983 3.873 3.765 3.659 3.557 3.457 3.36 3.265 3.173 3.083 2.996 2.911 2.829 2.748 2.67 2.594 2.52 2.448 2.378 2.31 2.244 2.179 2.117 2.056 1.997 1.94 1.884 1.83 1.777 1.726 1.676 1.628 1.581 1.535 1.491 1.448 1.406 1.365 1.326 1.287 1.25 1.214 1.179 1.145 1.112 1.079 1.048 1.018 0.988 0.96 0.932 0.905 0.879 0.853 0.828 0.804 0.781 0.758 0.736 0.715 0.694 0.674 0.655 0.636 0.617 0.599 0.582 0.565 0.549 0.533 0.517 0.502 0.488

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.799" PeakHeight="110.0" Num="3" Error="0.0">
-28.732 10.672 -2.117
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.799" EndFrequency="11.65" PeakHeight="376.981" Num="5" zHalfNm="301.869" Error="3.608">
-192.83 -63.081 27.132 -13.746 3.624
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="28.08" Depth="0.137"/>
<TopsideChapman PeakHeight="376.981" PeakDensity="1683902.0" PeakScaleHeight="53.004" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
