<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-28 -087 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 44 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: Multiple candidates for F2x cusp, F2 cusps do not match</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" >
2026.03.28 (087) 19:50:00</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">
FF202608703281950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="10.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.685" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.865" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="9.350" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="345.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="345.000" 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="10.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="465.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.311" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="352.683" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="261.197" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.702" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.000" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="124.688" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.449" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="66.071" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="150.300" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.340" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="6.700" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="82">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
345.000 345.000 345.000 350.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 375.000 380.000 380.000 382.500 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 402.000 404.000 406.000 408.000 410.000 410.000 412.500 415.000 415.000 415.000 420.000 420.000 422.500 425.000 425.000 425.000 430.000 430.000 430.000 435.000 435.000 436.538 438.077 439.615 441.154 442.692 444.231 445.769 447.308 448.846 450.385 451.923 453.462 455.000 456.250 457.500 458.750 460.000 462.500 465.000 470.000 480.000 485.626 492.260 500.200 509.875 521.922 537.336 557.757 586.098
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 72 75 69 72 75 75 75 78 75 81 81 84 84 84 81 84 72 75 81 87 84 87 81 87 90 75 69 75 84 66 75 66 0 72 0 63 66 0 60 69 63 63 57 0 66 66 63 63 66 66 60 63 0 0 57 0 0 0 0 0 0 0 0 0 60 0 54 0 57 0 45 51 42 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -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 -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 2.734375 -1.171875 -2.734375 -1.953125 1.171875 -1.171875 -2.734375 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="128">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 115.000 115.000 115.000 115.000 110.000 110.000 111.250 112.500 113.750 115.000 116.250 117.500 118.750 120.000 120.000 120.000 119.000 118.000 117.000 116.000 115.000 120.000 120.000 120.000 120.000 120.000 120.000 115.000 120.000 119.667 119.333 119.000 118.667 118.333 118.000 117.667 117.333 117.000 116.667 116.333 116.000 115.667 115.333 115.000 114.667 114.333 114.000 113.667 113.333 113.000 112.667 112.333 112.000 111.667 111.333 111.000 110.667 110.333 110.000 110.000 110.000 115.000 112.500 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.833 111.667 112.500 113.333 114.167 115.000 115.000 115.000 115.000 115.000 114.444 113.889 113.333 112.778 112.222 111.667 111.111 110.556 110.000 115.000 115.000 115.000 120.000 119.167 118.333 117.500 116.667 115.833 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.714 116.429 117.143 117.857 118.571 119.286 120.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 66 72 63 66 57 63 0 0 0 0 0 54 0 57 60 54 0 0 0 0 66 51 0 0 48 60 57 0 57 0 0 0 0 45 0 57 0 0 0 0 69 0 0 0 0 54 0 0 0 0 0 0 0 0 0 0 0 0 75 72 72 0 0 0 0 0 0 0 72 75 69 69 69 0 0 75 66 0 0 0 75 0 72 0 0 0 0 0 69 69 69 48 63 0 0 0 0 0 0 0 0 63 66 0 69 57 0 0 0 0 51 66 69 72 75 63 63 0 69 0 0 0 0 0 0 0 60
</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="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.681 90.0 95.0 100.0 105.0 110.0 115.0 116.544 120.0 123.088 125.0 129.632 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 352.683 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.227 1.551 2.001 2.236 2.311 2.237 2.184 2.184 2.184 2.221 2.311 2.322 2.478 2.651 2.838 3.037 3.245 3.458 3.673 3.889 4.104 4.317 4.529 4.738 4.945 5.151 5.355 5.557 5.758 5.959 6.159 6.358 6.557 6.756 6.955 7.154 7.353 7.553 7.754 7.955 8.157 8.36 8.563 8.766 8.97 9.174 9.376 9.577 9.774 9.967 10.15 10.321 10.474 10.601 10.693 10.743 10.75 10.749 10.737 10.715 10.682 10.639 10.586 10.525 10.455 10.378 10.294 10.203 10.105 10.003 9.895 9.782 9.666 9.545 9.422 9.295 9.166 9.034 8.901 8.766 8.63 8.492 8.354 8.216 8.077 7.938 7.799 7.661 7.523 7.385 7.249 7.113 6.978 6.845 6.712 6.581 6.452 6.323 6.197 6.071 5.948 5.826 5.706 5.588 5.471 5.356 5.243 5.132 5.023 4.916 4.81 4.706 4.604 4.504 4.406 4.31 4.215 4.122 4.031 3.942 3.854 3.769 3.685 3.602 3.522 3.443 3.365 3.289 3.215 3.142 3.071 3.002 2.934 2.867 2.802 2.738 2.675 2.614 2.554 2.496 2.439 2.383 2.328 2.275 2.222 2.171 2.121 2.072 2.024 1.978 1.932 1.887 1.844 1.801 1.76 1.719 1.679 1.64 1.602 1.565 1.529 1.493 1.459 1.425 1.392 1.359 1.328 1.297 1.267 1.237 1.208 1.18 1.153 1.126 1.1 1.074 1.049 1.025 1.001 0.978 0.955 0.932 0.911 0.89 0.869 0.849 0.829

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.311" PeakHeight="110.0" Num="3" Error="0.0">
-29.494 11.701 -2.526
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.311" EndFrequency="10.75" PeakHeight="352.683" Num="5" zHalfNm="261.197" Error="1.444">
-199.189 -40.225 22.677 -6.524 0.21
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.632" Depth="0.127"/>
<TopsideChapman PeakHeight="352.683" PeakDensity="1433777.9" PeakScaleHeight="66.071" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
