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Multi Beam Observations of Cosmic Radio Noise Using a Vhf Radar with Beam Forming by a Butler Matrix : Volume 9, Issue 26 (01/08/2011)

By Renkwitz, T.

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Book Id: WPLBN0003974510
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: Multi Beam Observations of Cosmic Radio Noise Using a Vhf Radar with Beam Forming by a Butler Matrix : Volume 9, Issue 26 (01/08/2011)  
Author: Renkwitz, T.
Volume: Vol. 9, Issue 26
Language: English
Subject: Science, Advances, Radio
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Rapp, M., Latteck, R., Singer, W., & Renkwitz, T. (2011). Multi Beam Observations of Cosmic Radio Noise Using a Vhf Radar with Beam Forming by a Butler Matrix : Volume 9, Issue 26 (01/08/2011). Retrieved from http://members.worldlibrary.net/


Description
Description: Leibniz Institute of Atmospheric Physics at the Rostock University, Schloss-Str. 6, 18225 Kühlungsborn, Germany. The Leibniz-Institute of Atmospheric Physics (IAP) in Kühlungsborn started to install a new MST radar on the North-Norwegian island Andøya (69.30° N, 16.04° E) in 2009. The new Middle Atmosphere Alomar Radar System (MAARSY) replaces the previous ALWIN radar which has been successfully operated for more than 10 years. The MAARSY radar provides increased temporal and spatial resolution combined with a flexible sequential point-to-point steering of the radar beam. To increase the spatiotemporal resolution of the observations a 16-port Butler matrix has been built and implemented to the radar. In conjunction with 64 Yagi antennas of the former ALWIN antenna array the Butler matrix simultaneously provides 16 individual beams. The beam forming capability of the Butler matrix arrangement has been verified observing the galactic cosmic radio noise of the supernova remnant Cassiopeia A. Furthermore, this multi beam configuration has been used in passive experiments to estimate the cosmic noise absorption at 53.5 MHz during events of enhanced solar and geomagnetic activity as indicators for enhanced ionization at altitudes below 90 km. These observations are well correlated with simultaneous observations of corresponding beams of the co-located imaging riometer AIRIS (69.14° N, 16.02° E) at 38.2 MHz. In addition, enhanced cosmic noise absorption goes along with enhanced electron densities at altitudes below about 90 km as observed with the co-located Saura MF radar using differential absorption and differential phase measurements.

Summary
Multi beam observations of cosmic radio noise using a VHF radar with beam forming by a Butler matrix

Excerpt
Andoya Rocket Range: AIRIS riometer, prefixhttp://alomar.rocketrange.no/iris-and.html, download in January 2011.; Butler, J. and Lowe, R.: Beam Forming Matrix Simplifies Design of Electronically Scanned Antennas, Electronic Design, 9, 170–173, 1961.; Campistron, B., Despaux, G., Lothon, M., Klaus, V., Pointin, Y., and Mauprivez, M.: A partial 45 MHz sky temperature map obtained from the observations of five ST radars, Ann. Geophys., 19, 863–871, doi:10.5194/angeo-19-863-2001, 2001.; Friedrich, M., Harrich, M., Torkar, K., and Stauning, P.: Quantitative measurements with wide-beam riometers, J. Atmos. Solar-Terr. Phys., 64, 359–365, 2002.; del Pozo, C. F., Honary, F., Stamatiou, N., and Kosch, M. J.: Study of auroral forms and electron precipitation with the IRIS, DASI and EISCAT systems, Ann. Geophys., 20, 1361–1375, doi:10.5194/angeo-20-1361-2002, 2002.; Harrich, M., Friedrich, M., Marple, S. R., and Torkar, K. M.: The background absorption at high latitudes, Adv. Radio Sci., 1, 325–327, doi:10.5194/ars-1-325-2003, 2003.; Kero, A., Enell, C.-F., Ulich, Th., Turunen, E., Rietveld, M. T., and Honary, F. H.: Statistical signature of active D-region HF heating in IRIS riometer data from 1994–2004, Ann. Geophys., 25, 407–415, doi:10.5194/angeo-25-407-2007, 2007.; Lancaster University, SPEARS Group: AIRIS riometer, prefixhttp://www.dcs.lancs.ac.uk/iono/cgi-bin/riometers?orderdir=asc;id=64, download in January 2011.; Latteck, R., Singer, W., and Bardey, H.: The ALWIN MST radar – Technical design and performances, Proceedings of the 14th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 1999.; Latteck, R., Singer, W., Rapp, M., and Renkwitz, T.: MAARSY – the new MST radar on Andøya/Norway, Adv. Radio Sci., 8, 219–224, doi:10.5194/ars-8-219-2010, 2010.; Renkwitz, T., Singer, W., and Latteck, R.: Study of multibeam ability for the VHF MST ALWIN radar system, Proceedings of the 12th International Workshop on technical and Scientific Aspects of MST radars, pp. 127–130, edited by: Swarnalingam, N. and Hocking, W. K., Canadian Association of Physicists, Ottawa, Ontario, Canada, ISBN 978-0-9867285-0-1, 2010.; Singer, W., Latteck, R., and Holdsworth, D.: A new narrow beam Doppler radar at 3 MHz for studies of the high-latitude middle atmosphere, Adv. Space Res., 41, 1488–1494, 2008.; Singer, W., Latteck, R., Friedrich, M., Wakabayashi, M., and Rapp, M.: Seasonal and solar activity variability of D-region electron density at 69° N, J. Atmos. Solar-Terr. Phys., \doi10.1016/j.jastp.2010.09.012, 2010.

 

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