<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-21 -080 17:10:00.000"
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" >
2026.03.21 (080) 17:10:00</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">
FF202608003211710009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="12.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.653" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.898" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.700" 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="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="450.000" 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="3.234" 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="/" />
<Modeled Name="foF1p" Val="4.287" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="358.177" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="263.484" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.150" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="129.851" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="59.907" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="72.396" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="150.270" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.620" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="155">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 260.000 265.000 265.000 266.944 268.889 270.833 272.778 274.722 276.667 278.611 280.556 282.500 284.444 286.389 288.333 290.278 292.222 294.167 296.111 298.056 300.000 300.000 300.000 300.000 301.667 303.333 305.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 350.000 347.500 345.000 345.000 345.000 350.000 355.000 355.000 355.000 355.000 355.000 355.000 355.000 357.500 360.000 360.000 365.000 365.000 365.000 366.667 368.333 370.000 370.000 370.000 370.000 370.000 373.333 376.667 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 385.000 386.667 388.333 390.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 397.500 400.000 400.000 402.500 405.000 407.500 410.000 405.000 410.000 411.250 412.500 413.750 415.000 415.000 417.500 420.000 422.500 425.000 430.000 435.000 435.000 440.000 445.000 445.000 450.000 450.000 455.000 460.000 465.000 470.000 475.000 479.194 483.809 488.914 494.590 500.939 508.087 516.197 525.476 536.196 548.722 563.552 581.386 603.239 630.643
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 48 48 0 0 45 0 0 0 0 0 0 0 0 0 0 0 0 0 0 54 54 51 45 0 0 48 0 0 51 48 48 60 60 60 57 63 63 63 60 66 66 66 66 66 0 69 69 66 66 0 69 66 63 66 66 69 66 63 69 54 0 69 69 57 0 66 66 0 72 72 69 66 0 69 69 66 66 66 0 0 63 66 69 66 63 0 0 51 54 0 60 63 60 0 63 63 63 0 0 54 60 63 63 60 57 57 60 60 0 57 60 0 54 0 45 57 54 0 0 0 51 51 0 51 0 51 54 48 51 51 48 51 51 51 51 51 51 51 0 51 51 51 51 48 51 48 45 45 48 48 42 42 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 1.953125 -0.390625 -2.734375 1.953125 0.390625 1.953125 -1.171875 0.390625 1.953125 -1.171875 -0.390625 1.171875 -1.171875 -0.390625 -1.953125 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 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" >
89.507 90.0 95.0 100.0 105.0 110.0 112.2 114.4 115.0 116.6 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 358.177 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.175 2.799 3.129 3.234 3.112 3.112 3.145 3.234 3.35 3.508 3.659 3.805 3.949 4.092 4.236 4.381 4.529 4.679 4.832 4.989 5.15 5.315 5.486 5.663 5.845 6.033 6.228 6.43 6.64 6.856 7.081 7.313 7.553 7.8 8.054 8.314 8.58 8.851 9.124 9.4 9.676 9.949 10.219 10.483 10.739 10.983 11.215 11.432 11.632 11.812 11.971 12.107 12.218 12.304 12.363 12.394 12.4 12.399 12.389 12.369 12.338 12.297 12.247 12.188 12.121 12.046 11.963 11.874 11.778 11.677 11.57 11.458 11.342 11.221 11.097 10.969 10.837 10.704 10.567 10.429 10.289 10.147 10.004 9.86 9.715 9.569 9.423 9.277 9.131 8.985 8.839 8.694 8.549 8.405 8.262 8.119 7.978 7.838 7.699 7.561 7.425 7.29 7.157 7.025 6.894 6.766 6.639 6.513 6.389 6.267 6.147 6.029 5.912 5.797 5.684 5.572 5.462 5.355 5.248 5.144 5.041 4.94 4.841 4.744 4.648 4.554 4.462 4.371 4.282 4.195 4.109 4.025 3.942 3.861 3.782 3.704 3.627 3.552 3.479 3.407 3.336 3.267 3.199 3.132 3.067 3.003 2.94 2.879 2.818 2.759 2.701 2.645 2.589 2.535 2.481 2.429 2.378 2.328 2.279 2.231 2.184 2.138 2.092 2.048 2.005 1.963 1.921 1.88 1.841 1.802 1.763 1.726 1.689 1.654 1.619 1.584 1.551 1.518 1.485 1.454 1.423 1.393 1.363 1.334 1.306 1.278

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.234" PeakHeight="110.0" Num="3" Error="0.0">
-30.384 12.979 -3.088
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.234" EndFrequency="12.4" PeakHeight="358.177" Num="5" zHalfNm="263.484" Error="3.297">
-207.381 -37.232 -0.679 2.884 0.831
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.6" Depth="0.122"/>
<TopsideChapman PeakHeight="358.177" PeakDensity="1907692.2" PeakScaleHeight="72.396" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
