3/15/2023 0 Comments Suncase cable channels![]() The Motivation for Modernization of Solar Radio Spectrography Instruments Even though the observations of a degradation of the SNR of GPS and SBAS caused by the solar bursts were documented in, the detailed information about the impact of observed phenomena onto the system performance is however missing and should be an object of a future research. Thus, the SBAS receiver requires a much higher signal to noise ratio for proper reception of the navigation messages than the GPS, so the aforementioned SNR drop can surely endanger the integrity of the satellite navigation system. The probability of a reception of the message depends, inter alia, on a signal to noise ratio and a bit rate, which is 10 times higher than the GPS message bit rate. The information about the navigation system failure must be detected within 6s therefore, the drop of the message reception probability is critical. The precision improvement is realized by the dissemination of wide range differential corrections while the safety is ensured by the provision of integrity information. These systems were developed as an improvement of the precision and safety of the current satellite navigation systems. The performance degradation can be also expected for the satellite-based augmentation systems (SBAS). Direct Influence of the Solar Radio Bursts on the Radio Systems This represents a very strong driver for the spectrograph upgrade from the point of view of the astrophysical research. In order to be able to observe their radio signatures, the radio spectrograph should have a comparable temporal resolution. The small-scale structures, which are expected (as indicated by our numerical simulations) to be the actual locations of an energy release in flares, have also short dynamic timescales (millisecond and shorter). Modern approaches to the flare energy release via a magnetic reconnection involve the energy cascading and fragmentation of the magnetic field structures in the solar atmosphere towards small scales. Radio spectrographs, which are capable to record the dynamics of spectra on very short time scales, thus represent a key tool for remote radio diagnostics of the processes that started the flare. Indeed, a radio emission connected with the beams of particles accelerated during the flare via a magnetic reconnection represents the first “messenger” of the solar flare ever. The first observations obtained by the new spectrograph and their comparison with the analog device are presented in the paper with future steps to put the spectrograph into the regular operation.Īmong all the radiation produced by solar flares the radio emission in decimetric range is the most closely related to the plasma processes of the flare energy release. ![]() To reduce the costs for such modernization, the operating frequency range was divided into four sub-bands of bandwidth 250 MHz, which brings another benefit of greater scalability. The higher time and frequency resolution and lower noise in comparison with the existing analog instrument were reached by the implementation of the latest optimal signal processing methods. The current spectrograph for the Ondrejov observatory (Astronomical Institute of Czech Academy of Sciences) was modernized by using a direct-conversion receiver connected to a field-programmable gate array (FPGA) for the fast Fourier transform (FFT) spectrum estimation and put into the test operation. Besides having a strong diagnostic significance for studying the flare energy release, the solar radio bursts can also cause strong interference for radio communication and navigation systems. The paper presents the concept, implementation, and test operation of a modernized solar radio spectrograph for an investigation of the solar emission and solar bursts in radio frequency bands. ![]()
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