Electron Density Profiles from FORMOSAT-3/COSMIC

<?xml version="1.0" encoding="UTF-8"?>
<Project xmlns="https://metadata.pithia.eu/schemas/2.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:gco="http://www.isotc211.org/2005/gco" xsi:schemaLocation="https://metadata.pithia.eu/schemas/2.2 https://metadata.pithia.eu/schemas/2.2/pithia.xsd">    
    <identifier>
        <PITHIA_Identifier>
            <localID>Project_UPC_COSMIC</localID>
            <namespace>upc</namespace>
            <version>1</version>
            <creationDate>2023-10-09T11:00:00Z</creationDate>
	    <lastModificationDate>2023-10-09T11:00:00Z</lastModificationDate>
        </PITHIA_Identifier>
    </identifier>
    <name>Electron Density Profiles from FORMOSAT-3/COSMIC</name>
    <shortName>ED-RO-COSMIC</shortName>
    <abstract>
    GPS radio occultations allow the sounding of the Earth&#8217;s atmosphere (i.e. troposphere and ionosphere). The basic observable of this technique is the additional delay, due tothe refractivity index, of a radiosignal when passing through the atmosphere. This additional delay is proportional to the integrated refractivity, in such a way that we can obtain an estimation of the vertical refractivity profiles using observations at different elevation angles by solving an inverse problem. Traditionally, the solution of this inverse problem is obtained by using the Abel inversion algorithm assuming a refractivity index that only depends on the altitude. In this paper we present a modified Abel inversion algorithm for ionospheric sounding that overcomes the spherical symmetry assumption of the traditional Abel inversion algorithm. Processing a set of simulated data and 1 day of real data with this algorithm, a clear improvement over the traditional one can be obtained when comparing the derived critical frequencies with the ionosonde measurements. It is also shown that this improvement is sufficient to measure critical frequencies associated with the ionospheric E layer.
    </abstract>
    <description>
    </description>
    <URL><gmd:URL>http://iswi-secretariat.org/</gmd:URL></URL>
    <documentation>
        <Citation>
            <gmd:title><gco:CharacterString>Electron density extrapolation above F2 peak by the linear Vary-Chap model
supporting new Global Navigation Satellite Systems-LEO occultation missions.</gco:CharacterString></gmd:title>
            <date xmlns="http://www.isotc211.org/2005/gmd">
                <CI_Date>
                    <date><gco:Date>2017-07-20</gco:Date></date>
                    <dateType>
                        <CI_DateTypeCode codeList="" codeListValue="">Publication Date</CI_DateTypeCode>                      
                    </dateType>
                </CI_Date>
            </date>
            <identifier xmlns="http://www.isotc211.org/2005/gmd">
               <MD_Identifier><code><gco:CharacterString>doi:10.1002/2017JA023876</gco:CharacterString></code></MD_Identifier>
            </identifier>
            <gmd:otherCitationDetails>
               <gco:CharacterString>
               Hernandez-Pajares, M., M. Garcia-Fernandez, A. Rius, R. Notarpietro, A. von Engeln, G. Olivares-Pulido, &#192;. Aragon-Angel,  and A. Garcia-Rigo (2017), Electron density extrapolation above F2 peak by the linear Vary-Chap model
supporting new Global Navigation Satellite Systems-LEO occultation missions, J. Geophys. Res. Space Physics, 122, doi:10.1002/2017JA023876.
               </gco:CharacterString>
            </gmd:otherCitationDetails>
            <onlineResource>
               <CI_OnlineResource xmlns="http://www.isotc211.org/2005/gmd">
                  <linkage>
			  <URL>https://doi.org/10.1002/2017JA023876</URL>
                  </linkage>
               </CI_OnlineResource>
            </onlineResource>
        </Citation>
    </documentation>    
    <keywords>
        <MD_Keywords xmlns="http://www.isotc211.org/2005/gmd">
            <keyword><gco:CharacterString>Ionosphere</gco:CharacterString></keyword>
            <type><MD_KeywordTypeCode codeList="#pr1" codeListValue="Observed Region"/></type>
        </MD_Keywords>
    </keywords>   
    <keywords>
        <MD_Keywords xmlns="http://www.isotc211.org/2005/gmd">
            <keyword><gco:CharacterString>Ionospheric Specification</gco:CharacterString></keyword>
            <keyword><gco:CharacterString>Ionospheric observations</gco:CharacterString></keyword>
            <keyword><gco:CharacterString>HF radio wave propagation</gco:CharacterString></keyword>       
            <type><MD_KeywordTypeCode codeList="#pr1" codeListValue="Miscellaneous"/></type>
        </MD_Keywords>
    </keywords>    
    <keywords>
        <MD_Keywords xmlns="http://www.isotc211.org/2005/gmd">
            <keyword><gco:CharacterString>Electron Density Profile</gco:CharacterString></keyword>
            <keyword><gco:CharacterString>COSMIC</gco:CharacterString></keyword>
            <keyword><gco:CharacterString>FORMOSAT-3</gco:CharacterString></keyword>
            <keyword><gco:CharacterString>Radio occultation</gco:CharacterString></keyword>
            <type><MD_KeywordTypeCode codeList="#pr1" codeListValue="Products"/></type>
        </MD_Keywords>
    </keywords>     
    <relatedParty>
        <ResponsiblePartyInfo>
            <role xlink:href="https://metadata.pithia.eu/ontology/2.2/relatedPartyRole/PointOfContact"/> 
            <party xlink:href="https://metadata.pithia.eu/resources/2.2/individual/upc/Individual_UPC_Hernandez"/> <!-- NB changed namespace from pithia to lgdc -->
        </ResponsiblePartyInfo>
    </relatedParty>
    <relatedParty>
        <ResponsiblePartyInfo>
            <role xlink:href="https://metadata.pithia.eu/ontology/2.2/relatedPartyRole/DataProvider"/> 
            <party xlink:href="https://metadata.pithia.eu/resources/2.2/organisation/pithia/Organisation_UPC-IonSAT"/>
        </ResponsiblePartyInfo>
    </relatedParty>
    <status xlink:href="https://metadata.pithia.eu/ontology/2.2/status/OnGoing"/> 
</Project>