<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-25 -084 19:10:00.000"
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="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: 85% PACIFIC flags: Multiple candidates for F2x 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" >
2026.03.25 (084) 19:10:00</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">
FF202608403251910009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="12.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.569" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.244" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.000" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="120.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="465.000" 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="2.662" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="376.568" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="282.749" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.641" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.300" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="129.579" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="59.653" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="69.931" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="152.770" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.440" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="167">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 260.000 260.000 260.000 260.000 265.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 283.333 286.667 290.000 290.000 292.500 295.000 300.000 297.500 295.000 300.000 300.000 300.000 305.000 305.000 305.000 307.500 310.000 311.667 313.333 315.000 315.000 317.500 320.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 328.000 331.000 334.000 337.000 340.000 340.000 340.000 340.000 340.000 345.000 347.500 350.000 345.000 350.000 352.500 355.000 355.000 355.000 355.000 360.000 360.000 360.000 362.500 365.000 367.500 370.000 370.000 370.000 370.000 370.000 375.000 377.500 380.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 421.667 423.333 425.000 425.000 425.000 425.000 425.000 435.000 435.000 435.000 435.000 440.000 442.500 445.000 445.000 447.500 450.000 450.000 452.500 455.000 460.000 462.500 465.000 465.000 465.000 470.000 475.000 475.000 480.000 485.000 490.000 492.500 495.000 502.500 510.000 510.000 515.000 521.315 528.248 535.894 544.369 553.815 564.410 576.377 590.001 605.652 623.817
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 57 63 60 57 0 54 57 60 63 63 63 63 57 63 60 60 0 0 60 60 0 60 0 0 63 66 0 66 66 69 66 0 66 0 0 66 66 0 63 66 66 63 60 66 66 63 57 0 66 0 0 57 63 66 69 69 66 0 54 66 66 0 57 66 48 69 60 63 69 0 63 0 54 60 66 66 72 63 48 57 60 66 66 69 66 66 66 63 66 66 69 69 66 69 69 69 69 66 69 66 63 0 60 66 69 66 0 0 51 66 66 63 63 66 63 60 63 63 0 0 60 0 60 0 0 51 57 57 57 54 0 51 54 48 54 54 0 54 51 0 51 54 51 51 51 51 54 54 54 0 54 0 48 54 54 54 54 54 51 0 0 48 48 45 42
</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 -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 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 -1.953125 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="Es" Polarization="O" Num="15">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
125.000 125.000 125.000 125.000 130.000 130.000 130.000 127.500 125.000 122.500 120.000 120.000 120.000 120.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 54 0 60 48 0 0 0 63 0 60 57 57 54 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
</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" >
89.608 90.0 95.0 100.0 105.0 110.0 114.786 115.0 119.573 120.0 124.359 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 376.568 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.232 1.788 2.305 2.576 2.662 2.539 2.539 2.539 2.55 2.662 2.682 2.834 2.984 3.133 3.283 3.435 3.589 3.745 3.905 4.069 4.236 4.407 4.582 4.762 4.946 5.134 5.327 5.525 5.728 5.935 6.146 6.362 6.583 6.807 7.036 7.269 7.505 7.745 7.989 8.235 8.484 8.735 8.988 9.243 9.499 9.755 10.01 10.264 10.516 10.764 11.007 11.242 11.468 11.682 11.881 12.061 12.219 12.35 12.451 12.518 12.548 12.55 12.547 12.533 12.507 12.47 12.422 12.365 12.298 12.223 12.14 12.049 11.951 11.846 11.736 11.619 11.498 11.372 11.242 11.108 10.971 10.831 10.688 10.543 10.396 10.247 10.097 9.946 9.794 9.641 9.488 9.335 9.181 9.029 8.876 8.724 8.573 8.422 8.273 8.124 7.977 7.831 7.687 7.544 7.402 7.262 7.123 6.987 6.852 6.719 6.587 6.458 6.33 6.204 6.08 5.958 5.838 5.72 5.604 5.49 5.377 5.267 5.158 5.051 4.947 4.844 4.743 4.644 4.546 4.451 4.357 4.265 4.175 4.086 4.0 3.915 3.831 3.75 3.669 3.591 3.514 3.439 3.365 3.292 3.221 3.152 3.084 3.017 2.952 2.888 2.825 2.764 2.704 2.645 2.588 2.532 2.476 2.423 2.37 2.318 2.267 2.218 2.169 2.122 2.076 2.03 1.986 1.942 1.9 1.858 1.817 1.778 1.739 1.7 1.663 1.627 1.591 1.556 1.522 1.488 1.456 1.424 1.392 1.362 1.332 1.302 1.274

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.662" PeakHeight="110.0" Num="3" Error="0.0">
-29.883 12.252 -2.761
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.662" EndFrequency="12.55" PeakHeight="376.568" Num="5" zHalfNm="282.749" Error="2.987">
-217.294 -44.503 10.149 -1.318 0.757
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="14.359" Depth="0.123"/>
<TopsideChapman PeakHeight="376.568" PeakDensity="1954125.2" PeakScaleHeight="69.931" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
