Abstract: We observed the faint meteors on the orbits close to the orbits of Pribram and Neuschwanstein meteorite falls and investigated the possibility that they belong to the stream. Several meteors with low orbital similarity criteria to Pribram and Neuschwanstein meteoroids were found. The atmospheric trajectories and heliocentric orbits of the detected meteors were analyzed to determine whether they are members of the same shower. An orbital evolution model was applied on a certain number of cloned particles to investigate their possible connection with the meteorite stream. Statistical tests were conducted to determine if such small sample of the orbits is similar by chance or if the stream is real. It was found that from the observational as well as the theoretical point of view it is impossible to prove the existence of faint meteor shower connected with the Pribram and Neuschwanstein meteorite stream.

Abstract: Primary energy release and particle acceleration are two key problems in the study of solar flares. The radio spectral observations at decimeter-centimeter wavelengths may provide abundant useful information in the source regions of solar flares. This report presents several recent results of the primary energy release and solar energetic electrons revealed by microwave spectral fine structures observed in the Chinese Solar Broadband Radio Spectrometers (SBRS) in Huairou and the Ondrejov Radio Spectrograph in the Czech Republic (ORSC). These spectral fine structures include microwave Zebra patterns and type III bursts. In the studied events, a super strong Zebra burst has revealed a rapid electron acceleration and plasma heating in a small compact source region just at the beginning of the solar flare. The microwave type III bursts may indicate the site of electron acceleration and primary energy release. Especially the reversal frequency of the microwave type III pair bursts can pinpoint the acceleration location, and their complex interior structures of microwave type III bursts reflects the complex dynamic processes and inhomogeneity in the source regions.