NDLI: Observations of Internal Charging Currents in Medium Earth Orbit

Content Provider	IEEE Xplore Digital Library
Author	Ryden, K.A. Morris, P.A. Ford, K.A. Hands, A. Dyer, C.S. Taylor, B. Underwood, C.I. Rodgers, D.J. Mandorlo, G. Gatti, G. Evans, H. Daly, E.J.
Copyright Year	1973
Abstract	The Galileo global navigation system will employ an array of satellites in medium Earth orbit (MEO). Internal charging is one of the primary hazards for any spacecraft in MEO, and accordingly, the Galileo test satellite, Giove-A, carries a detector, SURF, to undertake the measurement of internal charging currents at three different shielding depths. The currents are due to electrons stopped in three aluminum plates: the first plate is 0.5 mm thick and located under 0.5-mm Al-equivalent shielding, the second is 0.5 mm thick and located underneath the first plate, and the third is 1.0 mm thick and located underneath the second plate. Giove-A was successfully launched on December 28, 2005 into a 23 300-km circular 56^deg inclination orbit. In this paper, we provide data on the internal charging currents observed in 2006, with particular emphasis on two large charging events, one in mid-April and one in mid-December. Comparisons are made to predictions using the DICTAT internal charging tool and the FLUMIC ldquoworst caserdquo trapped electron belt model. In general, the charging currents observed are safely within the standard DICTAT 3.5/FLUMIC 3.0 predictions but are exceeded in the most shielded plate on five calendar days during December 2006. The December event was unique in 2006 in that it was triggered by the arrival of a coronal mass ejection (CME) rather than being due to the effects of a fast solar wind stream flowing from a coronal hole. The currents measured in the December event were, however, an order of magnitude lower than those predicted using the ldquoanomalously large eventrdquo supplement to FLUMIC which models the most extreme electron enhancements associated with CMEs.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	2473
Ending Page	2481
Page Count	9
File Size	1771713
File Format	PDF
ISSN	00933813
Volume Number	36
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Earth Electrons Current measurement Extraterrestrial measurements Predictive models Satellite navigation systems Hazards Space vehicles Testing Detectors medium Earth orbit (MEO) Energetic electron belts internal charging
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
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

Observations of internal charging and outer-belt electron enhancements from Giove-A

Radiation monitoring in medium Earth orbit over the solar minimum period

Internal Charging Measurements in Medium Earth Orbit Using the SURF Sensor: 2005–2014

Direct measurement of internal charging currents in geostationary transfer orbit

Measurements of the radiation belts from Mir and STRV 1994-1997

Energetic Proton Maps for the South Atlantic Anomaly

Energetic electron detection packages on board Chinese navigation satellites in MEO

The Trapped Proton Environment in Medium Earth Orbit (MEO)

Image Navigation and Registration improvements using GPS

Observations of Internal Charging Currents in Medium Earth Orbit

Similar Documents

Observations of internal charging and outer-belt electron enhancements from Giove-A

Radiation monitoring in medium Earth orbit over the solar minimum period

Internal Charging Measurements in Medium Earth Orbit Using the SURF Sensor: 2005–2014

Direct measurement of internal charging currents in geostationary transfer orbit

Measurements of the radiation belts from Mir and STRV 1994-1997

Energetic Proton Maps for the South Atlantic Anomaly

Energetic electron detection packages on board Chinese navigation satellites in MEO

The Trapped Proton Environment in Medium Earth Orbit (MEO)

Image Navigation and Registration improvements using GPS

Observations of Internal Charging Currents in Medium Earth Orbit