<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-29 -088 21:50:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o 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" >
2026.03.29 (088) 21:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202608803292150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="12.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.423" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.777" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.600" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="325.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="325.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="125.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="591.486" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.379" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="447.604" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="375.790" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.939" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.850" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="107.248" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="45.817" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="53.007" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="110.730" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.770" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.000" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="195">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
325.000 330.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 333.750 332.500 331.250 330.000 330.000 330.000 331.053 332.105 333.158 334.211 335.263 336.316 337.368 338.421 339.474 340.526 341.579 342.632 343.684 344.737 345.789 346.842 347.895 348.947 350.000 345.000 345.000 350.000 351.250 352.500 353.750 355.000 355.000 355.000 355.000 355.000 352.500 350.000 355.000 357.500 360.000 355.000 356.667 358.333 360.000 360.000 362.500 365.000 365.000 365.625 366.250 366.875 367.500 368.125 368.750 369.375 370.000 370.625 371.250 371.875 372.500 373.125 373.750 374.375 375.000 375.000 375.000 375.000 375.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 402.500 405.000 405.000 405.000 407.500 410.000 410.000 410.000 410.000 410.000 415.000 415.000 420.000 420.000 420.000 420.000 425.000 425.000 425.000 425.000 430.000 430.000 430.000 435.000 435.000 435.000 440.000 440.000 445.000 445.000 445.000 450.000 450.000 450.000 455.000 456.250 457.500 458.750 460.000 461.250 462.500 463.750 465.000 470.000 470.000 472.500 475.000 475.000 480.000 485.000 485.000 490.000 495.000 495.000 495.000 505.000 505.000 508.750 512.500 516.250 520.000 525.000 525.000 527.857 530.714 533.571 536.429 539.286 542.143 545.000 550.000 550.000 550.000 551.591 553.182 554.773 556.364 557.955 559.545 561.136 562.727 564.318 565.909 567.500 569.091 570.682 572.273 573.864 575.455 577.045 578.636 580.227 581.818 583.409 585.000 588.097 591.486
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
75 75 0 0 0 0 78 0 72 0 0 0 78 75 75 0 0 0 0 0 60 0 60 0 0 0 66 0 0 0 0 0 51 54 72 69 0 0 0 0 54 0 0 0 57 48 63 0 0 54 69 0 0 0 60 0 54 60 0 0 0 0 0 0 0 0 0 0 72 0 0 66 0 72 0 72 0 54 51 57 0 66 69 72 75 63 0 72 69 72 63 60 66 72 57 0 66 66 54 63 63 69 0 60 69 69 72 72 66 63 60 63 63 66 63 66 66 66 69 72 72 63 66 63 60 69 63 66 66 63 66 69 66 0 0 0 60 0 0 0 54 57 63 0 60 48 51 48 48 0 0 48 45 0 45 0 0 0 45 0 45 0 0 0 0 0 0 42 42 45 45 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 45 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="56">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 4.2 4.25 4.3 4.35 4.4 4.45 4.5 4.55 4.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
130.000 125.000 124.167 123.333 122.500 121.667 120.833 120.000 115.000 120.000 122.500 125.000 125.000 126.250 127.500 128.750 130.000 130.833 131.667 132.500 133.333 134.167 135.000 135.000 135.000 130.000 130.000 130.000 135.000 115.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 130.000 130.455 130.909 131.364 131.818 132.273 132.727 133.182 133.636 134.091 134.545 135.000 135.000 135.000 135.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 0 0 0 0 0 66 72 72 0 0 63 0 0 0 66 0 0 0 0 63 0 0 0 54 0 0 0 0 57 0 0 63 60 66 0 0 60 57 57 57 0 0 0 0 0 0 0 51 0 0 63 0 60 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.014 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.63 140.0 145.0 150.0 155.0 160.0 165.0 169.261 170.0 175.0 180.0 185.0 190.0 195.0 198.891 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 447.604 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.25 0.328 0.367 0.379 0.375 0.363 0.342 0.311 0.264 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.204 0.235 0.265 0.295 0.325 0.355 0.379 0.405 0.492 0.57 0.65 0.735 0.828 0.931 1.046 1.177 1.325 1.492 1.68 1.889 2.118 2.365 2.627 2.902 3.186 3.478 3.775 4.077 4.383 4.692 5.003 5.317 5.634 5.953 6.274 6.598 6.924 7.253 7.583 7.916 8.252 8.588 8.927 9.266 9.605 9.944 10.28 10.613 10.939 11.255 11.558 11.841 12.098 12.32 12.499 12.625 12.691 12.7 12.697 12.677 12.636 12.576 12.498 12.405 12.297 12.175 12.041 11.897 11.742 11.578 11.406 11.228 11.044 10.854 10.661 10.464 10.264 10.063 9.86 9.655 9.451 9.246 9.042 8.839 8.637 8.437 8.239 8.042 7.848 7.656 7.467 7.281 7.098 6.917 6.74 6.566 6.396 6.228 6.064 5.904 5.746 5.593 5.442 5.295 5.151 5.011 4.874 4.74 4.609 4.482 4.358 4.237 4.119 4.004 3.892 3.783 3.676 3.573 3.472 3.374 3.278 3.185 3.095 3.007 2.921 2.838 2.757 2.678 2.602 2.527 2.455 2.385 2.316 2.25 2.185 2.122 2.061 2.002 1.944 1.888 1.834 1.781 1.73 1.68 1.631 1.584 1.538 1.494 1.451 1.409 1.368 1.329 1.29 1.253 1.216 1.181 1.147 1.114 1.082 1.05 1.02 0.99 0.962 0.934 0.907 0.88 0.855 0.83 0.806

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.379" PeakHeight="110.0" Num="3" Error="0.0">
-19.614 2.811 -0.183
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.379" EndFrequency="12.7" PeakHeight="447.604" Num="5" zHalfNm="375.79" Error="8.549">
-241.737 -20.089 19.763 -12.129 5.479
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="88.891" Depth="0.179"/>
<TopsideChapman PeakHeight="447.604" PeakDensity="2001116.6" PeakScaleHeight="53.007" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
