Please wait, while we are loading the content...
Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Gillespie, K.M. Speirs, D.C. Ronald, K. Phelps, A.D.R. McConville, S.L. Cross, A.W. Bingham, R. Kellett, B.J. Vorgul, I. Cairns, R.A. |
| Copyright Year | 2008 |
| Description | Author affiliation: Dept. of Phys., Univ. of Strathclyde, Glasgow (Gillespie, K.M.; Speirs, D.C.; Ronald, K.; Phelps, A.D.R.; McConville, S.L.; Cross, A.W.; Bingham, R.) |
| Abstract | Auroral kilometric radiation (AKR) generation occurs naturally in the auroral zone above the Earth's atmosphere, within a large area of plasma depletion in which particles are accelerated into the polar regions of the Earth's magnetic dipole. Satellite missions revealed that the peak power emitted in AKR is around $10^{9}$ W centred at a frequency of ~ 300 kHz. The radiation emissions are observed at frequencies close to the electron cyclotron frequency and are polarised in the X mode. The electron beam in the auroral region is subject to magnetic compression as it descends towards the atmosphere, resulting in a horseshoe-shaped velocity distribution in the auroral electron flux through conservation of the magnetic moment. It is now thought that the transverse momentum in this distribution can give rise to a cyclotron maser instability. KARAT 3D particle in cell (PiC) code simulations were carried out to further investigate results from a laboratory experiment built to reproduce the mechanisms of AKR generation and also previous 2D PiC code simulations. The 3D results proved to be consistent with results from the laboratory experiment. Coupling with other modes with azimuthal structure was found that could not be accounted for in 2D simulations. Investigation is ongoing to study an up-shifted interaction regime, to investigate the viability of injecting a seed signal into the laboratory experiment to study the spatial growth rate of the instability to compare with theoretical predictions. Predicted spectra are consistent with the expectations of dispersion plots and indicate high pitch electrons are dominating the interaction. Simulations show the backward wave instability to be more resilient to Doppler broadening than the forward wave coupling. Resilience of the backward wave instability to Doppler broadening has important implications where there is a cold tenuous plasma in the resonant region. |
| Starting Page | 1 |
| Ending Page | 1 |
| File Size | 35125 |
| Page Count | 1 |
| File Format | |
| ISBN | 9781424419296 |
| ISSN | 07309244 |
| DOI | 10.1109/PLASMA.2008.4590650 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2008-06-15 |
| Publisher Place | Germany |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Laboratories Plasmas Solid modeling Three dimensional displays Cyclotrons Doppler effect Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| 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 |
|
Loading...
|