<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-28 -087 12:10:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</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) 12:10:00</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">
FF202608703281210009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="11.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.042" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="34.981" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="6.850" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.000" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.160" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="240.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="104.856" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="121.667" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="97.401" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="7.227" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="380.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.071" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.209" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="292.814" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="227.343" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.186" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.200" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="89.470" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="37.059" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="51.344" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="110.260" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.480" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="4.650" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="138">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 250.000 250.000 250.000 255.000 260.000 260.000 260.000 260.000 265.000 265.000 266.364 267.727 269.091 270.455 271.818 273.182 274.545 275.909 277.273 278.636 280.000 280.000 280.000 280.000 280.000 280.000 280.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 286.000 287.000 288.000 289.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 310.000 307.500 305.000 305.000 310.000 310.000 310.000 312.500 315.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 326.667 328.333 330.000 330.000 330.000 331.250 332.500 333.750 335.000 337.500 340.000 340.000 340.000 345.000 345.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 370.000 370.000 375.000 380.000 380.000 380.000 385.000 395.000 395.000 400.000 410.000 415.000 425.000 439.751 461.451 496.522
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 54 51 54 54 60 0 51 57 51 0 51 0 0 0 0 0 0 0 0 51 48 51 51 54 0 48 51 0 54 57 0 57 57 0 60 60 60 57 45 0 0 57 0 57 51 0 60 66 63 69 66 69 66 66 66 60 57 69 69 66 60 57 66 69 72 69 45 0 60 60 66 72 69 0 60 60 0 63 66 54 63 63 66 69 69 66 63 0 57 63 63 60 0 0 57 60 51 0 0 45 69 60 63 60 57 51 57 42 0 54 60 48 54 63 63 63 63 63 60 60 57 57 51 51 60 57 54 51 51 51 54 51 51 51 54 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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.953125 -0.390625 -0.390625 0.390625 -0.390625 2.734375 -0.390625 -1.171875 -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 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 1.171875 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -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 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 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="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.0 3.05 3.1 3.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
104.856 106.188 107.864 110.155
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -1.171875 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="74">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 105.000 105.000 107.500 110.000 110.000 111.538 113.077 114.615 116.154 117.692 119.231 120.769 122.308 123.846 125.385 126.923 128.462 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 129.615 129.231 128.846 128.462 128.077 127.692 127.308 126.923 126.538 126.154 125.769 125.385 125.000 124.615 124.231 123.846 123.462 123.077 122.692 122.308 121.923 121.538 121.154 120.769 120.385 120.000 119.615 119.231 118.846 118.462 118.077 117.692 117.308 116.923 116.538 116.154 115.769 115.385 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0 51 57 0 54 57 0 0 0 0 0 0 0 0 0 0 0 0 54 54 54 60 51 48 57 48 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 45 0 54 0 48 48 0 45 0 51 0 45 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 -2.734375 0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 1.171875 1.953125 2.734375 -1.953125 2.734375 1.171875 -1.953125 1.171875 1.171875 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -1.953125 -0.390625 -1.953125 0.390625 -0.390625 0.390625 -2.734375 -2.734375 2.734375 2.734375 -1.953125 1.953125 0.390625 0.390625 -1.171875 -1.953125 2.734375 2.734375 0.390625 -2.734375 -1.953125 0.390625 2.734375 1.953125 1.171875 -2.734375 -2.734375 -1.171875 -1.953125 2.734375 1.171875 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 2.734375 1.171875 1.171875
</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" >
90.0 95.0 97.401 100.0 100.304 103.207 105.0 106.11 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 292.814 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.977 3.16 3.06 3.035 3.035 3.112 3.16 3.326 3.505 3.668 3.824 3.975 4.125 4.276 4.428 4.584 4.743 4.907 5.077 5.254 5.439 5.632 5.835 6.049 6.276 6.517 6.773 7.045 7.336 7.645 7.972 8.317 8.676 9.043 9.413 9.776 10.122 10.443 10.729 10.976 11.178 11.333 11.438 11.492 11.5 11.498 11.479 11.44 11.383 11.31 11.221 11.118 11.002 10.874 10.736 10.589 10.434 10.271 10.102 9.928 9.749 9.567 9.381 9.193 9.004 8.813 8.622 8.431 8.24 8.05 7.861 7.674 7.488 7.304 7.122 6.943 6.766 6.592 6.42 6.252 6.087 5.924 5.765 5.609 5.457 5.307 5.161 5.018 4.879 4.743 4.61 4.48 4.353 4.23 4.109 3.992 3.877 3.766 3.658 3.552 3.449 3.349 3.252 3.157 3.065 2.976 2.889 2.804 2.722 2.642 2.564 2.489 2.415 2.344 2.275 2.208 2.142 2.079 2.017 1.958 1.899 1.843 1.788 1.735 1.684 1.634 1.585 1.538 1.492 1.447 1.404 1.362 1.322 1.282 1.244 1.207 1.171 1.136 1.102 1.069 1.037 1.006 0.976 0.947 0.919 0.891 0.864 0.839 0.814 0.789 0.766 0.743 0.72 0.699 0.678 0.658 0.638 0.619 0.6 0.582 0.565 0.548 0.532 0.516 0.5 0.485 0.471 0.457 0.443 0.43 0.417 0.404 0.392 0.38 0.369 0.358 0.347 0.337 0.327 0.317 0.307 0.298 0.289 0.281 0.272 0.264 0.256

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.16" PeakHeight="97.401" Num="3" Error="2.129">
-10.958 4.659 -1.102
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.16" EndFrequency="11.5" PeakHeight="292.814" Num="5" zHalfNm="227.343" Error="2.993">
-150.673 -38.001 -3.746 4.863 0.853
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.709" Depth="0.125"/>
<TopsideChapman PeakHeight="292.814" PeakDensity="1640818.9" PeakScaleHeight="51.344" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
