<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-21 -080 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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: Multiple candidates for F2x cusp, One of F2 cusps was derived from the other, Trace overlaps while constructing baseline</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" >
2026.03.21 (080) 19:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202608003211930009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="12.650" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.555" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.317" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.150" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.950" 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="115.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="460.000" 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="2.521" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="381.238" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="293.073" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.683" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.800" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="122.256" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="57.581" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="65.793" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="150.920" 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="160">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 12.45 12.5 12.55 12.6 12.65
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 290.000 285.000 285.000 287.500 290.000 292.500 295.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 311.667 313.333 315.000 325.000 326.250 327.500 328.750 330.000 330.000 330.000 325.000 326.250 327.500 328.750 330.000 340.000 340.000 335.000 338.333 341.667 345.000 345.000 347.500 350.000 350.000 350.000 350.000 350.000 355.000 355.000 357.500 360.000 360.000 362.500 365.000 366.250 367.500 368.750 370.000 370.000 370.000 375.000 375.000 377.500 380.000 380.000 380.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 400.000 400.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 420.000 417.500 415.000 420.000 420.000 420.000 425.000 425.000 430.000 430.000 431.667 433.333 435.000 430.000 435.000 435.000 435.000 436.667 438.333 440.000 440.000 441.667 443.333 445.000 445.000 447.500 450.000 452.500 455.000 456.250 457.500 458.750 460.000 460.000 460.000 460.000 470.000 470.000 475.000 477.500 480.000 480.000 483.750 487.500 491.250 495.000 498.750 502.500 506.250 510.000 514.998 520.456 526.443 533.038 540.339 548.467 557.569 567.833 579.495 592.862 608.339
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 48 60 0 0 0 0 60 57 0 0 63 63 0 60 57 51 66 60 54 0 0 69 0 0 0 0 0 60 60 60 0 0 0 54 57 63 66 0 0 63 69 0 60 66 54 66 66 63 66 0 60 63 0 57 0 48 0 60 63 66 57 60 0 54 63 66 54 60 63 66 69 66 66 69 69 66 66 57 63 66 69 69 69 66 60 57 69 63 63 66 0 69 63 63 0 66 63 63 63 0 66 63 0 63 60 0 54 57 0 0 45 60 57 60 60 0 0 57 60 0 0 57 57 0 57 0 51 0 48 0 54 54 0 45 51 54 51 0 51 54 0 0 0 0 0 0 0 54 54 54 54 0 51 42 0 0 0 0 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -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 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 1.953125 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 1.953125 -0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="28">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.8 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 120.000 120.000 120.000 120.000 117.500 115.000 115.000 120.000 120.000 117.500 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 0 0 66 63 0 63 63 66 63 0 60 0 0 66 0 0 66 0 0 0 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 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -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" >
89.635 90.0 95.0 100.0 105.0 110.0 115.0 115.479 120.0 120.959 125.0 126.438 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 381.238 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.23 1.693 2.183 2.439 2.521 2.418 2.397 2.397 2.397 2.488 2.521 2.649 2.82 2.984 3.145 3.305 3.463 3.623 3.783 3.944 4.108 4.273 4.441 4.612 4.785 4.962 5.141 5.324 5.511 5.701 5.895 6.093 6.295 6.501 6.711 6.925 7.143 7.366 7.593 7.824 8.06 8.299 8.543 8.791 9.042 9.297 9.555 9.816 10.078 10.341 10.605 10.866 11.124 11.376 11.618 11.848 12.06 12.248 12.408 12.531 12.613 12.649 12.65 12.646 12.629 12.598 12.556 12.501 12.436 12.36 12.275 12.181 12.078 11.968 11.851 11.728 11.598 11.464 11.324 11.181 11.033 10.882 10.728 10.572 10.414 10.254 10.092 9.93 9.766 9.602 9.438 9.274 9.11 8.947 8.784 8.622 8.461 8.301 8.142 7.985 7.829 7.675 7.523 7.372 7.223 7.076 6.931 6.788 6.647 6.508 6.372 6.237 6.105 5.974 5.846 5.72 5.597 5.475 5.356 5.239 5.124 5.011 4.901 4.792 4.686 4.581 4.479 4.379 4.281 4.184 4.09 3.998 3.908 3.819 3.732 3.648 3.565 3.483 3.404 3.326 3.25 3.176 3.103 3.032 2.962 2.894 2.827 2.762 2.698 2.636 2.575 2.516 2.457 2.401 2.345 2.291 2.237 2.186 2.135 2.085 2.037 1.989 1.943 1.898 1.854 1.811 1.768 1.727 1.687 1.648 1.609 1.572 1.535 1.499 1.464 1.43 1.396 1.364 1.332 1.301 1.27 1.241 1.212 1.183 1.156 1.129 1.102

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.521" PeakHeight="110.0" Num="3" Error="0.0">
-29.738 12.043 -2.67
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.521" EndFrequency="12.65" PeakHeight="381.238" Num="5" zHalfNm="293.073" Error="2.369">
-215.431 -54.435 14.978 -0.297 0.385
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="16.438" Depth="0.124"/>
<TopsideChapman PeakHeight="381.238" PeakDensity="1985390.9" PeakScaleHeight="65.793" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
