NDLI: GRAIL USOs; Another in-flight quartz radiation experiment

Content Provider	IEEE Xplore Digital Library
Author	Weaver, G.L. Asmar, S.W. Oudrhiri, K.
Copyright Year	2013
Description	Author affiliation: Radio Sci. Syst. Group, California Inst. of Technol., Pasadena, CA, USA (Asmar, S.W.; Oudrhiri, K.) \|\| Space Dept., Johns Hopkins Univ., Laurel, MD, USA (Weaver, G.L.)
Abstract	The Gravity Recovery and Interior Laboratory (GRAIL) mission successfully ended in December, 2012 after an extended science phase of over 280 days mapping the gravitation field gradient of the Moon with a precision of better than 50 E-6 g's over the entire lunar surface. The mission was performed by two tandem flying spacecraft, both of which carried a Microwave Dual One-way Ranging (DOWR) instrument that together formed a highly precise relative measure of the distance between the two spacecraft as they orbited the Moon. The precision of the radio link maintained by the DOWR instruments was derived from the frequency stability of the ultra-stable oscillators (USOs) on-board each spacecraft. The opportunity to observe the USOs frequency throughout the GRAIL mission provides a record of not only the intrinsic performance of the oscillators, but their behavior during exposure to space conditions. We describe the effect to the frequency of each GRAIL USO, A and B, resulting from the March 7th, 2012 X5.4 level solar flare, just several days into GRAIL's science collection phase. We discuss the impact of this radiation exposure, and the asymmetric behavior of two USOs coincidentally perturbed by the same space-weather event.
Sponsorship	IEEE Ultrason., Ferroelectr., Freq. Control Soc.
Starting Page	1007
Ending Page	1009
File Size	2268858
Page Count	3
File Format	PDF
DOI	10.1109/EFTF-IFC.2013.6702169
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-07-21
Publisher Place	Czech Republic
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space vehicles Earth Moon Oscillator GRAIL Irradiation Extraterrestrial measurements Orbits Distance measurement Gravity Space-weather
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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