<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-16 -075 20:00:00.000"
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" >
2026.03.16 (075) 20:00:00</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">
FF202607503162000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="12.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.512" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.645" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="7.500" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="7.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="370.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="370.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="511.250" 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="2.254" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="7.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="7.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="394.111" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="295.671" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.697" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.150" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="137.514" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="62.285" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="72.237" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="163.530" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.340" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="7.200" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="109">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
370.000 370.000 370.000 375.000 375.000 377.500 380.000 380.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 392.143 394.286 396.429 398.571 400.714 402.857 405.000 410.000 410.000 412.500 415.000 415.000 417.500 420.000 420.000 420.000 420.000 420.000 420.000 420.000 425.000 430.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 436.667 438.333 440.000 441.667 443.333 445.000 445.000 447.500 450.000 450.000 450.000 450.000 450.000 455.000 455.000 460.000 460.000 460.000 460.000 460.000 460.000 460.000 461.667 463.333 465.000 465.000 465.000 465.000 470.000 471.667 473.333 475.000 476.667 478.333 480.000 480.000 480.000 480.000 480.000 485.000 485.000 485.000 490.000 495.000 497.500 500.000 500.000 503.750 507.500 511.250 515.000 521.250 527.500 533.750 540.000 540.000 550.000 560.000 569.710 580.879 593.862 609.140 627.381 649.539
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 75 75 66 63 0 72 75 66 69 54 0 69 75 72 0 0 60 0 60 0 66 57 60 0 57 51 0 57 66 69 66 66 63 48 0 63 0 60 57 60 66 63 60 60 0 63 0 0 0 66 66 0 60 0 66 0 60 60 63 48 48 48 51 48 54 48 0 0 51 54 48 54 54 0 0 42 0 0 48 51 0 0 48 51 54 48 45 45 0 54 48 0 0 0 48 0 0 0 42 51 0 51 0 42 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -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 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 -1.953125 -2.734375 -1.171875 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 1.953125 1.953125 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="68">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 110.000 115.000 116.667 118.333 120.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 110.000 110.000 110.625 111.250 111.875 112.500 113.125 113.750 114.375 115.000 115.000 115.000 115.000 114.444 113.889 113.333 112.778 112.222 111.667 111.111 110.556 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 112.500 115.000 116.429 117.857 119.286 120.714 122.143 123.571 125.000 130.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
72 75 69 0 0 66 72 0 0 0 0 69 0 0 75 0 69 0 69 0 0 0 0 0 0 0 0 72 0 0 60 0 72 0 0 0 72 81 78 0 0 0 0 78 0 0 0 0 0 0 0 0 75 0 72 75 75 75 0 0 0 0 0 0 0 0 48 51
</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 -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 0.390625 0.390625 0.390625 0.390625 -0.390625 1.171875 0.390625 -1.953125 -0.390625 0.390625 1.171875 -1.171875 1.171875
</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" >
89.694 90.0 95.0 100.0 105.0 110.0 115.0 116.844 120.0 123.687 125.0 130.0 130.531 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 394.111 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.226 1.512 1.952 2.181 2.254 2.186 2.126 2.126 2.126 2.151 2.244 2.254 2.382 2.54 2.713 2.898 3.093 3.294 3.498 3.704 3.911 4.117 4.322 4.527 4.73 4.933 5.136 5.338 5.539 5.741 5.943 6.146 6.349 6.552 6.757 6.963 7.169 7.378 7.587 7.798 8.011 8.226 8.442 8.66 8.88 9.102 9.325 9.55 9.777 10.005 10.234 10.463 10.691 10.919 11.144 11.365 11.579 11.785 11.978 12.155 12.309 12.436 12.53 12.586 12.6 12.6 12.592 12.573 12.543 12.503 12.454 12.395 12.328 12.253 12.171 12.081 11.985 11.882 11.774 11.661 11.543 11.421 11.295 11.165 11.032 10.896 10.757 10.617 10.474 10.33 10.184 10.038 9.89 9.742 9.593 9.444 9.296 9.147 8.998 8.85 8.703 8.556 8.41 8.265 8.121 7.978 7.837 7.696 7.557 7.42 7.284 7.149 7.017 6.885 6.756 6.628 6.502 6.377 6.255 6.134 6.015 5.898 5.782 5.669 5.557 5.447 5.339 5.232 5.128 5.025 4.924 4.824 4.727 4.631 4.537 4.445 4.354 4.265 4.178 4.092 4.008 3.925 3.844 3.765 3.687 3.611 3.536 3.462 3.39 3.319 3.25 3.182 3.116 3.051 2.987 2.924 2.863 2.803 2.744 2.686 2.63 2.574 2.52 2.467 2.415 2.364 2.314 2.265 2.217 2.17 2.124 2.079 2.035 1.992 1.95 1.908 1.868 1.828 1.789 1.751 1.714 1.678 1.642 1.607 1.573 1.54 1.507

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.254" PeakHeight="110.0" Num="3" Error="0.0">
-29.423 11.602 -2.485
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.254" EndFrequency="12.6" PeakHeight="394.111" Num="5" zHalfNm="295.671" Error="2.676">
-235.501 -46.738 24.65 -5.474 -0.517
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="20.531" Depth="0.128"/>
<TopsideChapman PeakHeight="394.111" PeakDensity="1969727.0" PeakScaleHeight="72.237" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
