<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 19:30:00.000"
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) 19:30:00</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">
FF202605902281930009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="12.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.741" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="33.991" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.700" 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="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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.150" 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="2.570" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="346.556" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="277.518" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.562" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="93.725" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="43.000" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="49.906" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="124.080" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.080" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="175">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
235.000 236.364 237.727 239.091 240.455 241.818 243.182 244.545 245.909 247.273 248.636 250.000 255.000 255.000 255.000 256.250 257.500 258.750 260.000 260.000 262.500 265.000 265.000 270.000 275.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 280.000 281.500 283.000 284.500 286.000 287.500 289.000 290.500 292.000 293.500 295.000 295.000 297.500 300.000 305.000 305.000 305.000 305.000 305.000 310.000 311.250 312.500 313.750 315.000 317.000 319.000 321.000 323.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 335.000 335.000 337.500 340.000 341.250 342.500 343.750 345.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 361.000 362.000 363.000 364.000 365.000 365.000 365.000 365.000 370.000 375.000 375.000 375.000 375.000 377.500 380.000 380.000 380.000 385.000 386.667 388.333 390.000 390.000 387.500 385.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 395.000 397.500 400.000 400.000 400.000 400.000 400.000 400.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 415.000 416.429 417.857 419.286 420.714 422.143 423.571 425.000 425.000 425.000 427.500 430.000 430.000 430.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 440.000 440.000 445.000 447.500 450.000 452.500 455.000 457.500 460.000 462.500 465.000 470.000 470.000 474.966 480.642 487.191 494.831 503.860
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 0 0 0 48 0 0 0 0 0 57 57 48 57 0 0 0 51 48 0 60 60 0 57 60 0 0 69 66 66 69 63 0 0 0 0 0 0 0 0 0 60 57 0 66 63 69 69 69 63 66 0 0 0 48 0 60 0 0 54 0 66 69 66 45 57 51 57 0 51 0 0 0 60 63 63 66 63 66 66 54 57 63 54 0 0 0 0 51 63 66 66 0 54 66 69 69 0 60 66 69 60 0 0 57 63 0 69 72 0 72 66 69 66 72 69 66 60 0 63 66 66 66 0 60 51 0 54 0 60 63 63 0 0 60 63 45 0 0 0 0 0 54 0 60 0 54 0 60 0 60 0 0 57 0 0 57 57 57 0 0 0 60 0 60 0 57 48 0 51 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 -1.953125 -2.734375 -0.390625 -0.390625 -1.953125 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 0.390625 -0.390625 -1.171875 -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 1.953125 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -1.953125 -0.390625 2.734375 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 -1.953125 -1.171875 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" >
89.625 90.0 95.0 100.0 105.0 110.0 115.0 115.237 120.0 120.473 125.0 125.71 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 346.556 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.231 1.726 2.225 2.487 2.57 2.457 2.446 2.446 2.446 2.553 2.57 2.677 2.808 2.946 3.091 3.242 3.4 3.566 3.737 3.915 4.099 4.289 4.484 4.684 4.889 5.098 5.311 5.528 5.748 5.971 6.198 6.427 6.66 6.896 7.135 7.376 7.621 7.87 8.121 8.377 8.636 8.899 9.167 9.439 9.717 9.999 10.287 10.579 10.877 11.178 11.48 11.775 12.05 12.273 12.392 12.4 12.394 12.367 12.317 12.248 12.159 12.054 11.934 11.799 11.652 11.493 11.325 11.148 10.963 10.772 10.575 10.374 10.169 9.961 9.752 9.54 9.328 9.116 8.905 8.694 8.484 8.276 8.069 7.866 7.664 7.465 7.269 7.077 6.887 6.701 6.519 6.34 6.164 5.992 5.824 5.66 5.499 5.343 5.19 5.04 4.894 4.752 4.614 4.479 4.347 4.22 4.095 3.974 3.856 3.741 3.63 3.521 3.416 3.314 3.214 3.117 3.024 2.932 2.844 2.758 2.674 2.593 2.514 2.438 2.364 2.292 2.222 2.155 2.089 2.025 1.963 1.903 1.845 1.789 1.734 1.681 1.629 1.58 1.531 1.484 1.439 1.395 1.352 1.31 1.27 1.231 1.193 1.157 1.121 1.087 1.053 1.021 0.989 0.959 0.929 0.901 0.873 0.846 0.82 0.795 0.771 0.747 0.724 0.702 0.68 0.659 0.639 0.619 0.6 0.581 0.564 0.546 0.529 0.513 0.497 0.482 0.467 0.453 0.439 0.425 0.412 0.399 0.387 0.375 0.364 0.352 0.342

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.57" PeakHeight="110.0" Num="3" Error="0.0">
-29.789 12.117 -2.703
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.57" EndFrequency="12.4" PeakHeight="346.556" Num="5" zHalfNm="277.518" Error="1.635">
-170.115 -65.465 19.894 -5.839 0.679
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="15.71" Depth="0.124"/>
<TopsideChapman PeakHeight="346.556" PeakDensity="1907692.2" PeakScaleHeight="49.906" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
