Validation of IPS Single-Station Analysis (SSA) Using MEXART Routines in Multi-Station Spectra. Comparison with Cross Correlation Function (CCF) Analysis.
Abstract
The phenomenon of Interplanetary Scintillation (IPS) occurs from the scattering of radio waves coming from compact radio sources that cross electron density fluctuations in the interplanetary medium. By analyzing these fluctuations in the measurements of flux intensity of galactic (compact) radio sources in a radio telescope, it is possible to infer some properties of structures in the solar wind. Studies based on observations of IPS have provided valuable information on the physics of the internal heliosphere for over 50 years. There are two techniques that provide IPS results: 1) Single-Station Analysis (SSA), where a theoretical model is fitted to the observed spectrum; and 2) Cross-Correlation Function (CCF), where two antennas separated by a few hundred kilometers simultaneously and independently observe the same radio source. In order to combine and complement solar wind speed determinations, it is important to validate the results of these two IPS techniques. In this work we analyze events from previously studied observations from MERLIN (Multi-Element Radio-Linked Interferometer Network) using the CCF methodology. The SSA model fit is applied to these observations and compared with the previous results to validate the two techniques. The objective is to know the behavior of the parameters in cases studied by CCFs that can be implemented in the SSA model. This work studies the capability of SSA model fit to describe complex events in the interplanetary environment and seeks to improve the adjustment of parameters from individual spectra to the theoretical model. The validation of these two methodologies is important to be able to combine data in real time from different radio telescopes which is necessary for the success of the Worldwide Interplanetary Scintillation Stations (WIPSS) Network to monitor solar wind structures using IPS data.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2017
- Bibcode:
- 2017AGUFMSH21A2649B
- Keywords:
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- 4305 Space weather;
- NATURAL HAZARDS;
- 7594 Instruments and techniques;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY;
- 7924 Forecasting;
- SPACE WEATHER;
- 7999 General or miscellaneous;
- SPACE WEATHER