Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..710s&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Other
Scientific paper
ABSTRACT Reports concerning observations of dayside Auroral Kilometric Radiation (AKR) sources are very scarce. This contribution presents a search of dayside AKR sources based on analysis of data collected with Polrad swept frequency analyzer during almost 2.5 years of Interball-2 mission. It is based on previous work [1], taking into account the last findings concerning AKR directivity [2]. Arguments for dayside location of some AKR sources are presented and discussed. For a given spacecraft location visibility maps of the part of auroral oval that can host sources seen from that location are constructed in the geomagnetic dipole coordinates. Maps are based on spacecraft-source rectangular coordinates system as defined in [1] and are similar to maps constructed in [2] but do not constrain values of propagation and azimuthal angles to the narrow beams detected in the frame of CLUSTER mission. If such map with maximum propagation angle 90 (no refraction) is fully located on the dayside part of the hemisphere, then AKR source in question should be located on that side too. Delimiting map to regions corresponding to the AKR beams discussed in [2], and especially taking into account beaming in the direction parallel to the auroral oval means smaller potential AKR source region that further strengthens our conclusion. On the other hand fitting lines of constant propagation angle to the lower boundary of the AKR dynamic spectrum makes possible determination of MLT of the source. References [1] Schreiber, R. (2005), A simple model of the auroral kilometric radiation visibility, J.Geophys.Res., 110, A11222, doi:10.1029/2004JA010903. [2] Mutel, R. L., I. W. Christopher, and J. S. Pickett (2008), Cluster multispacecraft determination of AKR angular beaming, Geophys.Res.Lett., 35, L07104, doi:10.1029/2008GL033377.
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