<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-22 -081 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: 70% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, Unidentified traces above foF2</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" >
2026.03.22 (081) 19:50:00</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">
FF202608103221950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="11.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.765" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.414" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.700" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.200" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.510" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="270.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="270.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="91.875" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="95.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="91.119" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="8.999" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.450" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="465.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.335" 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="329.901" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="255.802" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.701" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.700" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="99.096" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="35.959" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="53.297" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="130.940" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.100" 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" >
4.25 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
270.000 270.000 270.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 280.000 280.000 282.500 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 296.667 298.333 300.000 300.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 307.500 310.000 310.000 310.000 310.000 312.500 315.000 315.000 318.750 322.500 326.250 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 352.500 355.000 360.000 361.250 362.500 363.750 365.000 365.000 367.500 370.000 370.000 370.000 375.000 375.000 375.000 377.500 380.000 380.000 382.500 385.000 385.000 390.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 410.000 410.000 412.000 414.000 416.000 418.000 420.000 420.000 423.333 426.667 430.000 430.000 430.000 430.000 430.000 435.000 440.000 445.000 450.000 450.000 455.000 457.500 460.000 460.000 460.000 465.000 465.000 470.562 477.113 484.942 494.464
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 60 66 0 63 57 54 0 63 63 57 0 57 0 0 57 0 0 66 54 0 0 60 0 0 0 66 69 63 0 69 72 72 75 0 69 51 0 69 0 63 48 0 0 0 0 0 0 45 0 0 60 66 0 0 72 66 72 69 72 72 57 72 69 51 72 60 48 66 69 63 69 54 0 0 0 60 63 0 51 66 69 60 63 63 0 60 69 60 69 75 60 63 72 78 69 72 60 69 72 60 60 66 66 60 57 0 0 60 0 57 57 0 0 48 54 54 0 48 60 54 60 54 57 48 0 51 54 48 48 51 54 45 51 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 -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 2.734375 -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 1.171875 -0.390625 -0.390625 -1.171875 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.171875 -1.171875 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.2 2.25 2.3 2.35 2.4 2.45 2.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
91.875 93.348 95.059 97.108 99.681 103.190 108.935
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 57 0 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 2.734375 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="21">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 100.000 100.000 100.000 100.000 98.333 96.667 95.000 95.000 98.750 102.500 106.250 110.000 105.000 101.667 98.333 95.000 100.000 100.000 100.000 100.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 63 63 0 69 0 0 63 0 0 0 0 54 0 0 57 0 0 69 0 66
</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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="190">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
81.957 85.0 90.0 91.119 95.0 97.539 100.0 103.959 105.0 110.0 110.379 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 329.901 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.854 2.49 2.51 2.461 2.374 2.374 2.374 2.396 2.502 2.51 2.667 2.818 2.961 3.1 3.239 3.378 3.519 3.663 3.811 3.964 4.121 4.283 4.45 4.623 4.802 4.985 5.174 5.369 5.568 5.771 5.979 6.19 6.404 6.621 6.841 7.063 7.288 7.514 7.741 7.971 8.202 8.435 8.67 8.907 9.146 9.386 9.629 9.872 10.115 10.355 10.585 10.79 10.943 11.0 11.0 10.99 10.963 10.919 10.859 10.786 10.699 10.599 10.489 10.369 10.24 10.103 9.958 9.808 9.651 9.491 9.326 9.158 8.987 8.814 8.64 8.464 8.288 8.112 7.936 7.761 7.586 7.413 7.241 7.07 6.902 6.735 6.571 6.409 6.25 6.093 5.938 5.787 5.638 5.492 5.348 5.208 5.071 4.936 4.804 4.676 4.55 4.427 4.307 4.189 4.075 3.963 3.854 3.748 3.644 3.543 3.445 3.349 3.255 3.164 3.076 2.989 2.905 2.823 2.744 2.666 2.591 2.517 2.446 2.377 2.309 2.244 2.18 2.118 2.057 1.999 1.941 1.886 1.832 1.78 1.729 1.679 1.631 1.584 1.539 1.495 1.452 1.41 1.37 1.33 1.292 1.255 1.219 1.184 1.15 1.117 1.084 1.053 1.023 0.993 0.965 0.937 0.91 0.884 0.858 0.834 0.81 0.786 0.764 0.742 0.72 0.699 0.679 0.66 0.641 0.622 0.604 0.587 0.57 0.553 0.537 0.522 0.507 0.492 0.478 0.464 0.451 0.438 0.425 0.413 0.401 0.389 0.378 0.367 0.357

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.51" PeakHeight="91.119" Num="3" Error="0.881">
-13.375 5.411 -1.198
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.51" EndFrequency="11.0" PeakHeight="329.901" Num="5" zHalfNm="255.802" Error="4.293">
-171.699 -63.905 18.813 -5.4 2.669
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.26" Depth="0.136"/>
<TopsideChapman PeakHeight="329.901" PeakDensity="1501240.8" PeakScaleHeight="53.297" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
