<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-16 -075 19:40:00.000"
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 33 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: F2o cusp not found, 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" >
2026.03.16 (075) 19:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607503161940009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="12.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.598" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.829" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="9.300" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="7.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.300" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.610" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="395.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="395.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="112.245" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="120.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="105.179" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="14.894" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="485.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.450" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="7.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="7.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="370.223" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="278.641" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.694" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.650" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="123.946" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="54.447" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="65.727" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="162.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.120" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="7.500" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="96">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
395.000 395.000 395.000 395.000 397.500 400.000 402.000 404.000 406.000 408.000 410.000 412.500 415.000 415.000 415.909 416.818 417.727 418.636 419.545 420.455 421.364 422.273 423.182 424.091 425.000 425.000 427.500 430.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 440.000 440.000 440.000 441.000 442.000 443.000 444.000 445.000 446.000 447.000 448.000 449.000 450.000 450.000 450.000 450.000 450.000 450.000 450.000 450.000 452.000 454.000 456.000 458.000 460.000 460.000 460.000 460.000 460.000 465.000 467.500 470.000 471.500 473.000 474.500 476.000 477.500 479.000 480.500 482.000 483.500 485.000 485.000 485.000 495.000 500.000 503.377 507.162 511.435 516.294 521.872 528.338 535.925 544.950 555.867 569.339 586.383
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 57 57 0 0 60 0 0 0 0 66 54 60 63 0 0 0 0 0 0 63 0 0 0 63 57 0 63 60 60 60 54 57 0 0 60 60 60 57 54 0 60 0 0 0 0 0 0 54 0 0 54 51 54 0 0 57 54 54 0 0 0 0 57 60 54 0 60 63 0 42 0 0 0 0 0 0 0 0 0 54 48 42 54 51 0 0 0 0 51 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 1.953125 -1.953125 -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 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 1.171875 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 -1.953125 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -1.953125 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.3 2.35 2.4 2.45 2.5 2.55 2.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
112.245 113.712 115.416 117.457 120.020 123.516 129.246
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 0 0 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 1.171875 0.390625 -0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="134">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
125.000 125.000 120.000 115.000 120.000 119.000 118.000 117.000 116.000 115.000 115.000 116.667 118.333 120.000 120.000 120.000 120.000 120.000 120.000 115.000 125.000 120.000 120.000 120.833 121.667 122.500 123.333 124.167 125.000 125.000 125.000 120.000 123.333 126.667 130.000 115.000 120.000 117.500 115.000 110.000 125.000 110.000 110.000 110.000 110.000 110.000 110.000 112.000 114.000 116.000 118.000 120.000 122.000 124.000 126.000 128.000 130.000 125.000 125.000 125.000 120.000 120.000 120.000 115.000 110.000 112.500 115.000 113.750 112.500 111.250 110.000 115.000 115.000 115.000 115.000 110.000 112.500 115.000 117.500 120.000 120.000 118.333 116.667 115.000 117.500 120.000 120.000 120.000 115.000 115.000 115.000 115.000 110.000 115.000 120.000 120.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 112.500 115.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 115.000 120.000 117.500 115.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 0 54 0 0 0 0 0 57 60 0 0 57 0 54 54 0 57 0 57 63 57 0 0 0 0 0 48 54 57 57 0 0 57 66 66 0 66 66 60 72 0 69 69 75 0 0 0 0 54 0 60 0 0 0 54 54 57 60 66 0 63 75 75 0 78 0 78 0 75 75 69 60 78 69 0 75 0 63 66 0 0 72 0 69 63 66 72 0 75 69 72 0 66 60 69 75 0 78 75 0 75 66 72 75 0 78 75 0 72 72 78 75 60 0 66 66 66 72 66 60 0 63 63 60 51 0 54 51 48 54 45 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 -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 2.734375 0.390625 0.390625 1.171875 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 -0.390625 0.390625 -1.171875 0.390625 0.390625 -1.171875 1.171875 1.171875 1.171875 0.390625 1.171875 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 0.390625 1.953125 -0.390625 1.171875 -0.390625 -1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -1.171875 1.171875 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 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
</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 95.0 100.0 105.0 105.179 110.0 111.01 115.0 116.842 120.0 122.673 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 370.223 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.92 2.445 2.61 2.61 2.52 2.477 2.477 2.477 2.549 2.61 2.677 2.838 3.021 3.223 3.438 3.66 3.882 4.102 4.317 4.527 4.733 4.935 5.132 5.327 5.519 5.708 5.896 6.083 6.268 6.453 6.638 6.822 7.007 7.192 7.378 7.564 7.752 7.941 8.132 8.325 8.519 8.716 8.915 9.116 9.321 9.528 9.739 9.952 10.169 10.389 10.612 10.838 11.065 11.291 11.514 11.729 11.926 12.092 12.206 12.25 12.25 12.244 12.224 12.192 12.149 12.094 12.028 11.953 11.868 11.775 11.674 11.566 11.451 11.33 11.204 11.072 10.936 10.796 10.652 10.505 10.356 10.204 10.05 9.894 9.737 9.58 9.421 9.262 9.103 8.944 8.785 8.627 8.469 8.312 8.156 8.002 7.848 7.696 7.546 7.396 7.249 7.103 6.96 6.818 6.677 6.539 6.403 6.269 6.137 6.007 5.879 5.754 5.63 5.509 5.389 5.272 5.157 5.044 4.933 4.824 4.718 4.613 4.51 4.41 4.311 4.215 4.12 4.027 3.936 3.848 3.76 3.675 3.592 3.51 3.43 3.352 3.275 3.2 3.127 3.055 2.985 2.916 2.849 2.784 2.72 2.657 2.595 2.535 2.477 2.419 2.363 2.309 2.255 2.203 2.152 2.102 2.053 2.005 1.958 1.913 1.868 1.825 1.782 1.741 1.7 1.66 1.622 1.584 1.547 1.511 1.475 1.441 1.407 1.374 1.342 1.311 1.28 1.25 1.221 1.192 1.164 1.137 1.111 1.084 1.059 1.034 1.01

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.61" PeakHeight="105.179" Num="3" Error="3.346">
-22.215 9.068 -2.032
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.61" EndFrequency="12.25" PeakHeight="370.223" Num="5" zHalfNm="278.641" Error="3.893">
-209.188 -63.078 32.653 -7.024 -0.913
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="17.494" Depth="0.133"/>
<TopsideChapman PeakHeight="370.223" PeakDensity="1861817.6" PeakScaleHeight="65.727" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
