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The Apollo Lunar heat flow experiment revisited: A critical reassessment of the in-situ thermal conductivity determination

Grott, M. und Knollenberg, J. und Krause, C. (2010) The Apollo Lunar heat flow experiment revisited: A critical reassessment of the in-situ thermal conductivity determination. Journal of Geophysical Research, 115 (E11). DOI: 10.1029/2010JE003612

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Offizielle URL: http://www.agu.org/pubs/crossref/2010/2010JE003612.shtml

Kurzfassung

Lunar heat flow was determined in situ during the Apollo 15 and 17 missions, but some uncertainty is connected to the value of the regolith's thermal conductivity, which enters as a linear factor into the heat flow calculation. Different approaches to determine the conductivity yielded discordant results, which led to a downward correction of the obtained heat flow values by 30%–50% subsequent to the publication of the first results. We have reinvestigated likely causes for the observed discrepancies and find that neither poor coupling between the probe and regolith nor axial heat loss can explain the obtained results. Rather, regolith compaction and compression likely caused a local increase of the regolith's thermal conductivity by a factor of 2–3 in a region which extends at least 2–5 cm from the borehole wall. We conclude that the corrected lunar heat flow values, which are based on thermal diffusivity estimates sampling a large portion of undisturbed regolith, represent robust results. Future in situ measurements of regolith thermal conductivity using active heating methods should take care to both minimize regolith disturbance during probe emplacement and maximize heating time to obtain reliable results. We find that for the Apollo measurements, heating times should have exceeded at least 100 h, and ideally 200 h.

Dokumentart:Zeitschriftenbeitrag
Titel:The Apollo Lunar heat flow experiment revisited: A critical reassessment of the in-situ thermal conductivity determination
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID
Grott, M.matthias.grott@dlr.deNICHT SPEZIFIZIERT
Knollenberg, J.joerg.knollenberg@dlr.deNICHT SPEZIFIZIERT
Krause, C.christian.krause@dlr.deNICHT SPEZIFIZIERT
Datum:2010
Erschienen in:Journal of Geophysical Research
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:115
DOI :10.1029/2010JE003612
Status:veröffentlicht
Stichwörter:Moon, Apollo, heat flux, thermal conductivity, regolith
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Vergleichende Planetologie (alt)
Standort: Köln-Porz , Berlin-Adlershof
Institute & Einrichtungen:Institut für Raumfahrtsysteme
Institut für Planetenforschung > Planetenphysik
Institut für Planetenforschung > Asteroiden und Kometen
Institut für Planetenforschung
Hinterlegt von: Noack, Lena
Hinterlegt am:13 Dez 2010 12:22
Letzte Änderung:06 Okt 2016 12:00

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