<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-24 -083 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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% 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" >
2026.03.24 (083) 21:30:00</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">
FF202608303242130009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="11.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.581" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.713" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="290.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="290.000" Name="h`F2" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="475.000" 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="0.619" 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="400.448" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="325.718" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.172" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="108.855" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.355" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="55.494" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="107.050" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.080" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="185">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
290.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 296.000 297.000 298.000 299.000 300.000 302.500 305.000 295.000 305.000 300.000 300.000 300.000 305.000 305.000 306.000 307.000 308.000 309.000 310.000 305.000 305.000 305.000 305.833 306.667 307.500 308.333 309.167 310.000 310.000 313.333 316.667 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 325.000 325.000 325.000 326.667 328.333 330.000 330.000 330.000 330.000 332.500 335.000 336.250 337.500 338.750 340.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 347.500 350.000 350.000 350.000 350.000 350.000 352.500 355.000 355.000 355.000 355.000 357.500 360.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 377.500 380.000 380.000 380.000 382.500 385.000 385.000 385.000 387.500 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 410.000 410.000 410.000 410.000 410.000 410.000 415.000 415.000 417.500 420.000 425.000 425.000 425.000 425.000 430.000 435.000 435.000 435.000 435.000 435.000 435.000 445.000 445.000 440.000 450.000 450.000 450.000 450.000 455.000 460.000 465.000 465.000 465.000 470.000 472.500 475.000 475.000 481.667 488.333 495.000 500.000 500.000 505.000 510.000 515.000 520.000 526.262 533.088 540.557 548.765 557.827 567.884 579.110 591.719
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 0 66 0 0 60 66 0 63 63 0 0 0 0 66 48 51 48 57 66 66 63 60 0 0 48 0 0 0 63 0 0 0 0 0 0 0 66 0 0 0 54 57 63 0 66 69 69 0 69 63 0 66 66 0 0 63 0 0 69 54 72 72 63 69 51 51 0 60 0 66 48 69 57 0 0 0 69 54 60 0 66 0 69 57 63 66 69 69 57 60 66 69 0 72 69 66 69 54 72 69 69 69 0 72 63 0 72 69 63 66 69 69 60 66 69 69 0 66 69 69 60 66 69 72 72 69 69 69 63 66 54 60 66 66 69 66 66 69 0 63 54 63 66 63 60 48 54 60 63 60 0 48 54 57 51 0 57 0 57 51 45 51 51 51 0 48 51 0 0 48 45 48 48 48 48 48 48 48 51 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 -1.171875 -0.390625 0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 0.390625 -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 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -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 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -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 -1.953125 -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 -2.734375 -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 2.734375 1.171875 -1.953125 -1.953125 -1.953125
</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" >
91.031 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 136.245 140.0 145.0 150.0 155.0 160.0 162.49 165.0 170.0 175.0 180.0 185.0 188.735 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 400.448 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.41 0.536 0.599 0.619 0.61 0.583 0.536 0.461 0.338 0.293 0.293 0.293 0.293 0.293 0.293 0.293 0.324 0.386 0.448 0.51 0.573 0.619 0.652 0.767 0.878 0.992 1.116 1.252 1.404 1.575 1.767 1.986 2.231 2.505 2.805 3.13 3.474 3.834 4.204 4.582 4.964 5.348 5.732 6.116 6.498 6.879 7.256 7.629 7.999 8.363 8.721 9.071 9.412 9.743 10.062 10.365 10.65 10.915 11.156 11.369 11.551 11.698 11.806 11.874 11.9 11.9 11.892 11.867 11.825 11.767 11.694 11.608 11.509 11.399 11.279 11.149 11.011 10.865 10.712 10.553 10.389 10.221 10.049 9.874 9.696 9.516 9.335 9.153 8.97 8.787 8.604 8.421 8.24 8.059 7.88 7.703 7.527 7.353 7.182 7.012 6.845 6.681 6.519 6.36 6.203 6.05 5.899 5.751 5.605 5.463 5.324 5.187 5.054 4.923 4.795 4.67 4.548 4.428 4.312 4.198 4.087 3.978 3.872 3.769 3.668 3.57 3.474 3.381 3.29 3.201 3.114 3.03 2.948 2.868 2.79 2.714 2.64 2.568 2.498 2.43 2.363 2.298 2.235 2.174 2.115 2.057 2.0 1.945 1.892 1.84 1.789 1.74 1.692 1.645 1.6 1.556 1.513 1.471 1.43 1.391 1.352 1.315 1.279 1.243 1.209 1.175 1.143 1.111 1.081 1.051 1.022 0.993 0.966 0.939 0.913 0.888 0.863 0.839 0.816 0.793 0.771 0.75 0.729 0.709 0.689 0.67

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.619" PeakHeight="110.0" Num="3" Error="0.0">
-23.881 5.53 -0.618
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.619" EndFrequency="11.9" PeakHeight="400.448" Num="5" zHalfNm="325.718" Error="3.877">
-213.749 -0.098 4.087 -4.936 2.983
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="78.735" Depth="0.326"/>
<TopsideChapman PeakHeight="400.448" PeakDensity="1756947.9" PeakScaleHeight="55.494" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
