<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-21 -080 19:50:00.000"
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: 90% PACIFIC flags: 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) 19:50:00</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">
FF202608003211950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="12.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.545" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.445" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.450" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.050" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.339" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="390.562" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="298.001" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.701" 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="129.454" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="60.611" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="68.876" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="148.620" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.480" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="184">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 12.7 12.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 257.500 260.000 262.500 265.000 265.000 265.000 265.000 265.000 266.250 267.500 268.750 270.000 271.250 272.500 273.750 275.000 275.000 276.250 277.500 278.750 280.000 283.333 286.667 290.000 290.000 290.000 291.667 293.333 295.000 296.667 298.333 300.000 300.000 300.000 301.875 303.750 305.625 307.500 309.375 311.250 313.125 315.000 315.000 320.000 320.000 320.000 321.000 322.000 323.000 324.000 325.000 325.000 325.000 326.667 328.333 330.000 335.000 335.000 335.000 340.000 341.250 342.500 343.750 345.000 345.000 345.000 347.500 350.000 350.000 352.500 355.000 355.000 355.000 360.000 360.000 360.000 362.500 365.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 375.000 377.500 380.000 380.000 380.000 382.500 385.000 387.500 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 400.000 400.909 401.818 402.727 403.636 404.545 405.455 406.364 407.273 408.182 409.091 410.000 410.000 410.000 415.000 415.000 415.000 416.000 417.000 418.000 419.000 420.000 425.000 425.000 425.000 430.000 430.000 431.250 432.500 433.750 435.000 430.000 430.000 435.000 440.000 442.500 445.000 440.000 440.000 440.000 445.000 450.000 450.000 450.000 453.333 456.667 460.000 460.000 465.000 467.000 469.000 471.000 473.000 475.000 475.000 475.000 475.000 475.000 485.000 486.667 488.333 490.000 490.000 495.000 500.000 505.000 510.000 515.000 520.000 525.000 531.110 537.891 545.459 553.960 563.577 574.547 587.174 601.867 619.178 639.873
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 51 54 57 57 57 0 0 0 0 0 0 0 63 57 48 66 0 54 0 0 0 66 66 0 0 0 0 0 66 66 66 0 0 0 0 0 0 0 0 0 0 57 63 0 0 0 0 66 69 69 0 0 69 63 0 69 57 0 48 0 60 0 69 57 63 66 0 60 66 69 57 63 69 54 63 66 72 69 66 69 57 63 69 72 60 66 0 72 0 69 51 57 66 66 69 60 0 66 69 72 66 0 0 0 0 0 48 0 0 0 0 69 69 66 66 66 63 0 0 0 0 63 60 63 63 54 57 0 0 0 57 60 42 0 57 0 45 57 0 57 0 54 0 57 0 0 51 54 45 0 0 0 0 45 54 45 51 48 54 0 0 48 63 0 0 51 51 54 54 54 48 51 0 48 45 42 0 45 0 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 2.734375 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 2.734375 -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 1.953125 -0.390625 -1.953125 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="20">
<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 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 115.000 115.000 115.000 115.833 116.667 117.500 118.333 119.167 120.000 115.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 63 63 0 0 60 0 0 0 69 69 0 60 60 60 0 0 57 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
</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" >
89.675 90.0 95.0 100.0 105.0 110.0 115.0 116.4 120.0 122.801 125.0 129.201 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 390.562 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.227 1.57 2.025 2.263 2.339 2.263 2.213 2.213 2.213 2.256 2.339 2.359 2.486 2.614 2.745 2.879 3.017 3.158 3.304 3.455 3.61 3.771 3.936 4.107 4.284 4.466 4.654 4.848 5.047 5.251 5.461 5.676 5.897 6.122 6.352 6.587 6.825 7.068 7.315 7.565 7.818 8.074 8.333 8.594 8.857 9.121 9.387 9.652 9.918 10.182 10.445 10.704 10.959 11.208 11.449 11.68 11.897 12.099 12.28 12.438 12.567 12.664 12.726 12.75 12.75 12.745 12.727 12.698 12.657 12.605 12.543 12.472 12.392 12.303 12.206 12.103 11.993 11.876 11.754 11.627 11.495 11.359 11.22 11.077 10.93 10.782 10.631 10.478 10.324 10.168 10.012 9.855 9.697 9.539 9.381 9.223 9.066 8.909 8.752 8.597 8.442 8.289 8.137 7.986 7.837 7.689 7.542 7.398 7.255 7.113 6.974 6.837 6.701 6.567 6.435 6.306 6.178 6.052 5.928 5.806 5.686 5.569 5.453 5.339 5.227 5.118 5.01 4.904 4.8 4.698 4.598 4.5 4.404 4.309 4.217 4.126 4.037 3.95 3.865 3.781 3.699 3.618 3.54 3.462 3.387 3.313 3.24 3.169 3.1 3.032 2.965 2.9 2.836 2.774 2.713 2.653 2.594 2.537 2.481 2.426 2.372 2.32 2.268 2.218 2.169 2.121 2.073 2.027 1.982 1.938 1.895 1.853 1.812 1.771 1.732 1.693 1.656 1.619 1.583 1.547 1.513 1.479 1.446 1.414 1.382 1.351 1.321

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.339" PeakHeight="110.0" Num="3" Error="0.0">
-29.528 11.749 -2.546
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.339" EndFrequency="12.75" PeakHeight="390.562" Num="5" zHalfNm="298.001" Error="2.924">
-224.956 -44.799 10.106 -2.628 0.916
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.201" Depth="0.126"/>
<TopsideChapman PeakHeight="390.562" PeakDensity="2016904.5" PeakScaleHeight="68.876" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
