Radio Science at IAP

Radio Science at IAP plays an important role on the studies of the MLT region, from using both radar as well as radio techniques. Although many observations can be done with commercial radar/radio instruments, the quality, precision, as well as spatial and temporal resolutions can be considerably improved with radio science techniques. This is particularly true for existing unique IAP instruments like MAARSY and Saura radars, as well as for the reengineering of existing instruments, like the MMARIA concept on specular meteor radars. Radio science activities at IAP involve among other:

  • antenna design and testing using numerical electromagnetic codes as well as passive and active experiments,
  • design and development of acquisition radio/radar systems (like SANDRA),
  • implementation of pulse compression, multi-pulse, and multi-frequency schemes,
  • use of magnetoionic theory to derived parameters from Faraday rotation radar and/or riometer observations (e.g., D region electron densities),
  • spatial as well as frequency domain radar imaging techniques, etc.

Given that advances of technology, where one can sample almost continuously in time and at different receiving antennas, and pulses can be changed arbitrarily, both in phase and amplitude, the radio science techniques must be accompanied by robust inverse theory, either via backward or forward scattering model approaches (e.g., Maximum Entropy in radar imaging).

Publications

  • J. L. Chau, T. Renkwitz, G. Stober und R. Latteck, MAARSY multiple receiver phase calibration using radio sources, J. Atmos. Solar-Terr. Phys., doi:10.1016/j.jastp.2013.04.004, 2014
  • J. L. Chau, J. Röttger und M. Rapp, PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies, J. Atmos. Solar-Terr. Phys., doi:10.1016/j.jastp.2013.06.015, 2014
  • S. Sommer, G. Stober, J. L. Chau und R. Latteck, Geometric considerations of polar mesospheric summer echoes in tilted beams using coherent radar imaging,Adv. Radio Sci., accepted, 2014
  • T. Renkwitz, G. Stober, R. Latteck, W. Singer und M. Rapp, New experiments to validate the radiation pattern of the Middle Atmosphere Alomar Radar System (MAARSY), Adv. Radio Sci., 11, 283-289, doi:10.5194/ars-11-283-2013, 2013
  • Hysell, D. L. and J. L. Chau, Aperture Synthesis Radar Imaging for Upper Atmospheric Research, in Doppler Radar Observations - Weather Radar, Wind Profiler, Ionospheric Radar, and Other Advanced Applications, Edited by Joan Bech, and Jorge L. Chau, InTech, ISBN 978-953-51-0496-4, 470pp, 2012
  • R. Latteck, W. Singer, M. Rapp, B. Vandepeer, T. Renkwitz, M. Zecha und G. Stober, MAARSY - the new MST radar on Andøya-system description and first results, Radio Sci., doi:10.1029/2011RS004775, 2012
  • M. Rapp, R. Latteck, G. Stober, P. Hoffmann, W. Singer und M. Zecha, First three-dimensional observations of polar mesosphere winter echoes: Resolving space-time ambiguity, J. Geophys. Res., 116, A11307, doi:10.1029/2011JA016858, 2011