<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 21:10:00.000"
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="2 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x 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" >
2026.02.28 (059) 21:10:00</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">
FF202605902282110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="11.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.738" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.619" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.850" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="90.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="480.000" 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="1.169" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="359.855" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="299.228" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.190" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.700" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="88.310" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="31.967" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="43.187" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="103.120" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.250" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="151">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 280.000 280.000 280.000 280.000 280.000 280.000 285.000 286.000 287.000 288.000 289.000 290.000 291.000 292.000 293.000 294.000 295.000 290.000 295.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 300.000 300.000 301.667 303.333 305.000 307.500 310.000 311.250 312.500 313.750 315.000 316.250 317.500 318.750 320.000 321.667 323.333 325.000 325.000 325.000 325.000 330.000 330.000 332.500 335.000 335.000 335.000 336.250 337.500 338.750 340.000 340.000 345.000 345.000 350.000 350.000 351.000 352.000 353.000 354.000 355.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 385.000 385.000 390.000 390.000 392.500 395.000 395.000 395.000 395.000 397.500 400.000 402.500 405.000 405.000 405.000 410.000 410.000 410.000 412.500 415.000 415.000 415.000 420.000 420.000 420.000 421.667 423.333 425.000 427.500 430.000 432.500 435.000 435.000 435.000 437.500 440.000 441.667 443.333 445.000 440.000 440.000 442.500 445.000 450.000 450.000 450.000 452.500 455.000 460.000 460.000 460.000 460.000 460.000 465.000 465.000 465.000 467.500 470.000 475.000 475.000 475.000 477.500 480.000 485.000 490.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 57 0 0 0 51 51 0 0 0 0 51 0 0 0 0 51 54 60 57 54 51 0 48 51 48 54 54 0 0 0 0 0 63 0 0 0 0 66 0 0 60 0 0 60 63 0 63 60 63 54 60 63 69 0 0 0 63 60 66 66 57 63 0 0 0 0 66 66 72 60 66 69 57 66 69 72 72 69 72 72 69 72 63 69 51 72 66 66 57 63 66 69 69 0 69 0 63 66 66 63 63 69 57 66 66 66 63 0 66 0 0 69 0 63 0 54 0 63 0 54 0 0 48 60 0 0 57 57 0 54 0 51 48 0 54 48 48 54 0 54 0 51 54 0 54 0 54 57 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="24">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.7 1.75 1.8 1.85 1.9 1.95 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
90.000 95.000 94.167 93.333 92.500 91.667 90.833 90.000 90.000 90.000 90.000 92.000 94.000 96.000 98.000 100.000 95.000 95.000 95.000 95.000 95.000 95.000 95.000 95.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 54 0 0 0 0 0 63 60 63 60 0 0 57 0 51 60 0 51 0 0 0 51 51
</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 0.390625 -2.734375 -0.390625 1.171875 -0.390625 -2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="184">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.124 95.0 100.0 105.0 110.0 115.0 120.0 124.249 125.0 130.0 135.0 138.498 140.0 145.0 150.0 152.747 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 359.855 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.779 1.013 1.132 1.169 1.149 1.087 0.997 0.997 0.997 0.997 0.997 1.015 1.075 1.136 1.169 1.276 1.449 1.603 1.755 1.911 2.075 2.25 2.436 2.635 2.848 3.073 3.311 3.559 3.815 4.078 4.346 4.617 4.89 5.163 5.438 5.712 5.987 6.261 6.536 6.812 7.089 7.366 7.646 7.927 8.211 8.498 8.789 9.083 9.382 9.686 9.996 10.309 10.625 10.938 11.23 11.46 11.55 11.55 11.534 11.491 11.422 11.329 11.215 11.082 10.932 10.767 10.59 10.4 10.202 9.995 9.782 9.563 9.341 9.116 8.888 8.66 8.432 8.204 7.978 7.753 7.531 7.311 7.095 6.882 6.673 6.468 6.267 6.07 5.877 5.69 5.506 5.328 5.154 4.984 4.82 4.659 4.504 4.353 4.206 4.064 3.926 3.793 3.663 3.538 3.416 3.299 3.185 3.075 2.968 2.865 2.766 2.67 2.576 2.487 2.4 2.316 2.235 2.156 2.081 2.007 1.937 1.869 1.803 1.739 1.678 1.619 1.562 1.507 1.453 1.402 1.353 1.305 1.259 1.214 1.171 1.13 1.09 1.051 1.014 0.978 0.943 0.91 0.877 0.846 0.816 0.787 0.759 0.732 0.707 0.681 0.657 0.634 0.611 0.59 0.569 0.549 0.529 0.51 0.492 0.475 0.458 0.442 0.426 0.411 0.396 0.382 0.369 0.355 0.343 0.331 0.319 0.308 0.297 0.286 0.276 0.266 0.257 0.248 0.239 0.23 0.222 0.214 0.207

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.169" PeakHeight="110.0" Num="3" Error="0.0">
-27.174 8.745 -1.447
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.169" EndFrequency="11.55" PeakHeight="359.855" Num="5" zHalfNm="299.228" Error="4.325">
-177.377 -51.26 28.893 -11.993 4.629
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="42.747" Depth="0.172"/>
<TopsideChapman PeakHeight="359.855" PeakDensity="1655117.9" PeakScaleHeight="43.187" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
