<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-20 -079 19:30:00.000"
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: 80% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o 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" >
2026.03.20 (079) 19:30:00</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">
FF202607903201930009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="11.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.653" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.774" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.900" 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="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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="470.000" 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="2.524" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="361.749" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="277.155" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.682" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="116.769" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="46.479" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="63.510" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="138.990" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.420" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="153">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
270.000 271.250 272.500 273.750 275.000 275.000 275.000 275.000 275.000 276.250 277.500 278.750 280.000 280.000 280.000 282.500 285.000 285.000 285.000 290.000 290.000 290.000 290.000 300.000 300.000 305.000 302.500 300.000 300.000 300.000 305.000 305.000 305.000 308.333 311.667 315.000 315.000 315.000 315.000 316.250 317.500 318.750 320.000 320.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 337.143 339.286 341.429 343.571 345.714 347.857 350.000 350.000 355.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 371.667 373.333 375.000 375.000 375.000 375.000 380.000 381.429 382.857 384.286 385.714 387.143 388.571 390.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 405.000 402.500 400.000 405.000 405.000 405.000 405.000 406.667 408.333 410.000 410.000 410.000 410.000 410.000 412.500 415.000 415.000 417.500 420.000 422.500 425.000 427.500 430.000 432.500 435.000 437.500 440.000 442.500 445.000 447.500 450.000 452.500 455.000 460.000 460.000 465.000 470.000 470.000 475.000 480.000 485.000 490.000 496.479 503.936 512.610 522.828 535.040 549.894 568.350 591.901
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 0 0 0 51 54 0 66 69 0 0 0 66 0 54 0 63 63 60 63 60 0 54 60 66 51 57 69 0 57 0 63 0 0 0 0 0 0 72 0 0 51 72 69 63 66 66 66 66 66 69 66 66 69 69 72 0 0 0 0 0 0 66 69 60 0 0 66 69 63 66 69 63 63 45 66 66 0 0 63 69 72 69 66 0 0 0 0 0 0 63 66 66 72 72 69 69 0 69 0 66 60 57 60 0 66 63 0 66 63 0 0 66 0 66 66 51 0 63 63 51 0 63 63 57 57 48 54 0 54 45 54 45 51 0 51 48 51 51 51 48 51 48 51 0 51 0 48 51 48 0 0 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -2.734375 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 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 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 -1.953125 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" >
89.635 90.0 95.0 100.0 105.0 110.0 115.0 115.464 120.0 120.927 125.0 126.391 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 361.749 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.23 1.695 2.185 2.442 2.524 2.42 2.4 2.4 2.4 2.492 2.524 2.63 2.773 2.913 3.052 3.191 3.332 3.475 3.621 3.77 3.923 4.08 4.242 4.408 4.579 4.755 4.938 5.125 5.319 5.518 5.724 5.935 6.153 6.377 6.606 6.841 7.082 7.327 7.577 7.832 8.09 8.351 8.615 8.88 9.145 9.409 9.671 9.928 10.179 10.421 10.652 10.866 11.062 11.234 11.377 11.488 11.563 11.597 11.6 11.597 11.581 11.553 11.512 11.46 11.397 11.324 11.242 11.151 11.052 10.945 10.832 10.713 10.588 10.458 10.324 10.186 10.044 9.899 9.752 9.602 9.45 9.297 9.143 8.988 8.832 8.676 8.521 8.365 8.21 8.055 7.901 7.748 7.596 7.446 7.297 7.149 7.003 6.858 6.716 6.575 6.436 6.299 6.164 6.031 5.9 5.772 5.645 5.52 5.398 5.278 5.16 5.044 4.93 4.819 4.709 4.602 4.497 4.394 4.293 4.194 4.097 4.002 3.909 3.818 3.729 3.642 3.556 3.473 3.391 3.311 3.233 3.157 3.082 3.009 2.938 2.868 2.8 2.734 2.668 2.605 2.543 2.482 2.423 2.365 2.308 2.253 2.199 2.146 2.095 2.044 1.995 1.947 1.9 1.855 1.81 1.766 1.724 1.682 1.642 1.602 1.563 1.526 1.489 1.453 1.418 1.383 1.35 1.317 1.285 1.254 1.224 1.194 1.165 1.137 1.11 1.083 1.057 1.031 1.006 0.982 0.958 0.935 0.912 0.89 0.868 0.847 0.827

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.524" PeakHeight="110.0" Num="3" Error="0.0">
-29.741 12.048 -2.672
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.524" EndFrequency="11.6" PeakHeight="361.749" Num="5" zHalfNm="277.155" Error="2.907">
-198.398 -44.384 6.653 -0.038 0.809
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="16.391" Depth="0.124"/>
<TopsideChapman PeakHeight="361.749" PeakDensity="1669478.9" PeakScaleHeight="63.51" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
