<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 21:30:00.000"
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: 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" >
2026.04.05 (095) 21:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609504052130009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.518" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.321" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.700" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="315.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="315.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="108.333" 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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="521.429" 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="0.559" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="411.715" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="344.162" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.497" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.950" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="99.141" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="31.535" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="50.348" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="101.930" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.760" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="2.650" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="165">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
320.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 325.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 335.000 335.714 336.429 337.143 337.857 338.571 339.286 340.000 335.000 337.500 340.000 340.000 340.000 340.000 340.000 340.000 345.000 346.000 347.000 348.000 349.000 350.000 350.000 351.667 353.333 355.000 355.000 355.000 350.000 351.667 353.333 355.000 355.000 355.000 355.000 357.500 360.000 360.000 360.000 360.000 360.000 365.000 366.667 368.333 370.000 370.000 370.000 370.000 370.000 370.000 370.000 370.000 375.000 376.000 377.000 378.000 379.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 420.000 420.000 420.000 425.000 425.000 425.000 425.000 430.000 430.000 435.000 435.000 435.000 440.000 440.000 440.000 445.000 445.000 450.000 450.000 455.000 455.000 455.000 460.000 465.000 465.000 470.000 471.667 473.333 475.000 475.000 480.000 480.000 490.000 490.000 490.000 495.000 500.000 503.571 507.143 510.714 514.286 517.857 521.429 525.000 530.000 535.000 538.333 541.667 549.271 558.117 568.537 580.989
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 69 0 63 75 72 0 0 0 78 0 0 69 75 57 0 0 60 0 66 0 72 57 0 63 0 0 0 0 0 0 57 0 0 0 0 69 0 0 60 66 0 0 0 54 60 60 0 0 48 51 57 66 0 0 63 48 69 69 63 63 0 0 57 63 63 0 0 54 0 66 0 63 0 0 60 57 0 45 0 0 60 69 0 72 78 78 81 87 75 78 81 63 63 66 69 72 63 66 0 66 60 66 72 78 66 69 51 75 75 69 72 72 66 72 75 66 66 63 69 66 72 66 66 69 60 66 63 66 69 57 60 54 60 66 66 63 69 60 0 0 66 63 66 63 51 60 60 57 51 0 0 51 45 0 48 48 0 48 0 42 48 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -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 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 1.953125 2.734375 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 2.734375 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 2.734375 0.390625 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 1.171875 1.171875 -1.953125 -0.390625 -1.953125 -2.734375 -2.734375 2.734375 -2.734375 -2.734375 0.390625 -1.953125 -1.171875 -2.734375 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="16">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 101.250 102.500 103.750 105.000 105.000 106.000 107.000 108.000 109.000 110.000 110.000 115.000 120.000 120.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 0 0 0 63 63 0 0 0 0 54 54 0 60 57 54
</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 1.171875 0.390625 1.171875 0.390625 0.390625
</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" >
91.29 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 137.116 140.0 145.0 150.0 155.0 160.0 164.231 165.0 170.0 175.0 180.0 185.0 190.0 191.347 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 411.715 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.37 0.484 0.541 0.559 0.551 0.528 0.486 0.421 0.316 0.249 0.249 0.249 0.249 0.249 0.249 0.249 0.258 0.315 0.372 0.429 0.486 0.544 0.559 0.645 0.746 0.845 0.947 1.054 1.168 1.291 1.425 1.57 1.728 1.9 2.086 2.287 2.504 2.735 2.981 3.24 3.512 3.796 4.091 4.394 4.707 5.026 5.352 5.683 6.019 6.358 6.7 7.043 7.387 7.729 8.07 8.406 8.735 9.056 9.364 9.656 9.928 10.175 10.392 10.572 10.711 10.804 10.847 10.85 10.846 10.822 10.78 10.721 10.646 10.556 10.452 10.336 10.21 10.073 9.928 9.776 9.616 9.451 9.281 9.107 8.93 8.75 8.569 8.386 8.202 8.018 7.834 7.651 7.469 7.288 7.109 6.931 6.756 6.583 6.412 6.244 6.079 5.917 5.757 5.601 5.448 5.297 5.151 5.007 4.866 4.729 4.595 4.464 4.336 4.212 4.09 3.972 3.856 3.744 3.635 3.528 3.425 3.324 3.226 3.13 3.037 2.947 2.86 2.774 2.692 2.611 2.533 2.457 2.383 2.312 2.242 2.175 2.109 2.046 1.984 1.924 1.866 1.81 1.755 1.702 1.65 1.6 1.552 1.505 1.459 1.415 1.372 1.33 1.29 1.25 1.212 1.175 1.14 1.105 1.071 1.039 1.007 0.976 0.947 0.918 0.89 0.863 0.836 0.811 0.786 0.762 0.739 0.716 0.695 0.673 0.653 0.633 0.614 0.595 0.577 0.559 0.542 0.525 0.509 0.494 0.479 0.464

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.559" PeakHeight="110.0" Num="3" Error="0.0">
-23.169 4.966 -0.507
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.559" EndFrequency="10.85" PeakHeight="411.715" Num="5" zHalfNm="344.162" Error="4.214">
-209.545 -18.611 8.677 -3.252 2.363
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="81.347" Depth="0.31"/>
<TopsideChapman PeakHeight="411.715" PeakDensity="1460576.9" PeakScaleHeight="50.348" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
