<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-01 -060 18:50:00.000"
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="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: 90% PACIFIC flags: 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" >
2026.03.01 (060) 18:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202606003011850009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="12.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.508" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.103" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.150" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.460" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="220.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="220.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="97.416" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="94.781" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="4.698" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="475.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.837" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="391.258" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="283.354" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.579" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="150.665" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="70.800" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="80.588" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="170.240" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.570" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="181">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 12.6 12.65 12.7 12.75 12.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
220.000 220.000 222.500 225.000 227.500 230.000 232.500 235.000 235.000 235.000 239.000 243.000 247.000 251.000 255.000 255.000 260.000 260.000 260.000 265.000 270.000 270.000 270.000 273.333 276.667 280.000 283.333 286.667 290.000 290.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 302.500 305.000 305.000 305.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 322.500 325.000 327.500 330.000 330.000 330.000 330.000 332.500 335.000 337.500 340.000 340.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 346.667 348.333 350.000 350.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 375.000 375.000 375.000 375.000 377.500 380.000 380.000 382.500 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 407.500 410.000 410.000 415.000 415.000 415.000 415.000 417.500 420.000 420.000 420.000 420.000 421.875 423.750 425.625 427.500 429.375 431.250 433.125 435.000 430.000 431.667 433.333 435.000 437.500 440.000 445.000 450.000 450.000 451.667 453.333 455.000 456.667 458.333 460.000 460.000 465.000 470.000 470.000 475.000 475.000 470.000 480.000 475.000 480.000 485.000 490.000 495.000 498.333 501.667 505.000 510.000 515.000 520.000 520.000 530.000 540.000 540.000 545.000 560.000 560.000 570.000 579.486 590.485 603.392 618.750 637.331 660.268 689.296
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 0 0 0 0 0 48 51 48 0 0 0 0 48 51 48 48 48 54 54 54 45 0 0 48 0 0 48 54 54 54 57 60 57 57 60 57 0 57 60 60 57 60 48 0 57 0 63 60 60 57 60 57 0 54 0 48 57 0 69 57 66 48 57 63 66 72 72 69 63 69 69 0 0 66 66 66 69 69 66 66 69 63 0 69 66 66 54 0 66 69 0 63 69 54 63 66 57 60 69 54 60 66 69 60 63 69 60 60 66 66 60 69 66 63 63 66 66 57 63 66 63 60 0 0 0 0 0 0 0 57 60 0 0 57 0 57 0 42 48 0 0 0 0 0 54 57 54 45 54 45 51 0 54 0 0 0 54 54 0 0 54 54 57 54 54 0 45 54 54 45 54 51 51 48 51 0 45 42 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 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 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -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 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 0.390625 0.390625 0.390625 0.390625 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.15 2.2 2.25 2.3 2.35 2.4 2.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
97.416 97.913 98.448 99.026 99.655 100.344 101.107
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 0 0 54 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 2.734375 -2.734375 1.953125 -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" >
90.0 94.781 95.0 98.738 100.0 102.694 105.0 106.651 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 391.258 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.46 2.46 2.354 2.354 2.354 2.416 2.46 2.547 2.677 2.809 2.943 3.08 3.22 3.364 3.51 3.661 3.815 3.973 4.135 4.301 4.471 4.645 4.824 5.006 5.193 5.383 5.578 5.777 5.979 6.185 6.395 6.608 6.825 7.045 7.267 7.493 7.721 7.951 8.184 8.418 8.654 8.891 9.129 9.368 9.606 9.844 10.08 10.315 10.547 10.775 10.999 11.217 11.428 11.631 11.824 12.005 12.172 12.324 12.458 12.572 12.665 12.735 12.78 12.799 12.8 12.797 12.786 12.765 12.736 12.698 12.653 12.6 12.541 12.474 12.402 12.323 12.239 12.149 12.055 11.956 11.853 11.746 11.636 11.522 11.405 11.286 11.163 11.039 10.913 10.784 10.655 10.523 10.391 10.258 10.124 9.989 9.854 9.719 9.583 9.448 9.312 9.177 9.042 8.907 8.773 8.64 8.507 8.376 8.245 8.114 7.985 7.857 7.73 7.605 7.48 7.357 7.235 7.114 6.995 6.876 6.76 6.645 6.531 6.418 6.307 6.198 6.09 5.983 5.878 5.775 5.672 5.572 5.473 5.375 5.279 5.184 5.091 4.999 4.908 4.819 4.732 4.645 4.561 4.477 4.395 4.315 4.235 4.157 4.081 4.005 3.931 3.858 3.787 3.716 3.647 3.579 3.512 3.447 3.382 3.319 3.257 3.196 3.136 3.077 3.019 2.962 2.907 2.852 2.798 2.745 2.693 2.643 2.593 2.544 2.495 2.448 2.402 2.356 2.312 2.268 2.225 2.182 2.141 2.1 2.06 2.021 1.983

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.46" PeakHeight="94.781" Num="3" Error="1.584">
-6.969 2.806 -0.618
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.46" EndFrequency="12.8" PeakHeight="391.258" Num="5" zHalfNm="283.354" Error="3.212">
-253.249 -39.789 9.543 -1.692 0.58
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="11.87" Depth="0.106"/>
<TopsideChapman PeakHeight="391.258" PeakDensity="2032754.4" PeakScaleHeight="80.588" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
