<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-13 -072 19:50:00.000"
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 22 0 0 0 0 0 0 0 0 0 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" >
2026.03.13 (072) 19:50:00</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">
FF202607203131950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="11.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.619" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.462" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.400" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.800" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.360" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="275.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="275.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="91.204" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="135.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="93.054" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="3.935" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="475.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.367" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="351.522" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="266.037" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.699" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.900" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="116.286" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="42.959" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="61.703" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="146.110" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.200" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="136">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 275.000 275.000 280.000 280.000 280.000 280.000 280.000 285.000 285.000 286.250 287.500 288.750 290.000 291.667 293.333 295.000 295.000 297.500 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 315.000 315.000 317.500 320.000 320.000 320.000 321.250 322.500 323.750 325.000 330.000 330.000 332.500 335.000 335.000 340.000 340.000 340.000 342.500 345.000 345.000 345.000 345.000 345.000 350.000 355.000 355.000 355.000 355.000 360.000 361.667 363.333 365.000 366.667 368.333 370.000 370.000 375.000 375.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 425.000 430.000 430.000 432.500 435.000 437.500 440.000 440.000 440.000 440.000 445.000 445.000 447.500 450.000 450.000 450.000 460.000 465.000 465.000 470.000 470.000 475.000 475.000 480.000 485.000 490.000 495.000 495.000 498.576 502.639 507.295 512.684 518.995 526.486 535.521 546.633
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 63 63 51 0 0 0 54 60 60 0 0 0 0 0 0 51 60 0 51 0 0 0 63 60 0 69 69 69 0 0 72 69 72 60 66 69 57 0 66 0 63 57 60 0 57 66 54 57 60 0 60 63 69 72 69 69 54 51 54 63 60 0 0 57 0 0 60 72 60 69 72 72 63 57 63 63 69 63 66 66 60 66 66 60 63 60 63 66 60 69 66 63 63 63 63 63 63 54 63 60 57 57 0 0 0 45 45 57 54 54 54 0 48 48 0 51 51 57 54 57 57 54 54 51 48 42 54 54 54 54 0 51 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 0.390625 0.390625 0.390625 0.390625 -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 2.734375 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 -1.171875 0.390625 1.171875 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 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="12">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
91.204 91.668 92.167 92.704 93.286 93.920 94.616 95.387 96.250 97.232 98.373 99.739
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 0 0 0 0 60 0 60 57
</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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="31">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
145.000 140.000 135.000 135.000 132.500 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 129.000 128.000 127.000 126.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 130.000 130.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 54 60 0 60 60 63 66 63 57 51 0 60 57 0 60 0 0 0 0 57 0 54 0 69 69 0 72 60 63
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.054 90.0 93.054 95.0 99.311 100.0 105.0 105.568 110.0 111.825 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 351.522 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.516 2.36 2.348 2.234 2.234 2.234 2.234 2.323 2.36 2.474 2.636 2.788 2.936 3.083 3.23 3.38 3.531 3.687 3.845 4.008 4.174 4.345 4.52 4.698 4.881 5.067 5.256 5.449 5.644 5.842 6.041 6.243 6.447 6.652 6.859 7.067 7.276 7.487 7.698 7.911 8.124 8.339 8.555 8.772 8.99 9.209 9.429 9.649 9.869 10.089 10.306 10.518 10.722 10.91 11.07 11.189 11.247 11.25 11.247 11.23 11.2 11.158 11.104 11.039 10.964 10.879 10.786 10.685 10.577 10.461 10.34 10.213 10.081 9.945 9.805 9.662 9.516 9.367 9.217 9.064 8.911 8.756 8.601 8.445 8.29 8.134 7.979 7.825 7.671 7.518 7.367 7.216 7.068 6.92 6.775 6.631 6.489 6.348 6.21 6.074 5.94 5.808 5.678 5.55 5.424 5.301 5.18 5.061 4.944 4.83 4.718 4.607 4.5 4.394 4.29 4.189 4.09 3.992 3.897 3.804 3.713 3.624 3.537 3.452 3.368 3.287 3.207 3.129 3.053 2.979 2.906 2.835 2.766 2.699 2.632 2.568 2.505 2.443 2.383 2.325 2.268 2.212 2.157 2.104 2.052 2.001 1.952 1.903 1.856 1.81 1.766 1.722 1.679 1.637 1.597 1.557 1.519 1.481 1.444 1.408 1.373 1.339 1.306 1.273 1.241 1.211 1.18 1.151 1.122 1.094 1.067 1.04 1.015 0.989 0.965 0.941 0.917 0.894 0.872 0.85 0.829 0.808 0.788 0.768 0.749 0.73 0.712 0.694

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.36" PeakHeight="93.054" Num="3" Error="0.687">
-5.815 2.319 -0.504
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.36" EndFrequency="11.25" PeakHeight="351.522" Num="5" zHalfNm="266.037" Error="3.208">
-198.53 -59.454 21.977 -6.059 2.369
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="18.771" Depth="0.126"/>
<TopsideChapman PeakHeight="351.522" PeakDensity="1570254.4" PeakScaleHeight="61.703" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
