[en] The paper presents a summary of results on the comparison of pulsations data from the satellite ATS 6 and the surface station Nagycenk for a year in 1973-74. In spite of the difference in position and L-value, strong similarities were observed, and even a part of the existing differences could be explained in terms of the afternoon-activity unobservable on ground. Diurnal variation of short period pulsation amplitudes were detected. The dependence of observed pulsation characteristics on solar wind velocity are discussed. (D.Gy.)

[en] The connection between the activity of the geomagnetic pulsations with periods of 1-600 s and some parameters of the interplanetary medium (magnitude and direction of the interplanetary magnetic fiels, IMF, and solar wind velocity) was studied on the basis of the records from the years 1971-1973 of the Nagycenk Observatory, Hungary. The activity of the pulsations with periods less than 30 s increases with increasing IMF magnitude as described by the hyperbolic connection between the two quantities. The maximum activity was found for periods below 30 s at a cone angle of 30 deg, while the maximum for longer periods lies at 0 deg. The increase of the amplitudes due to increasing solar wind velocity is the strongest for periods of 15-30 s. (author)

[en] A comparison is made of results obtained at two widely separated observatories, Nagycenk in Hungary and Uzur in Soviet Siberia (both at geomagnetic latitude 48 deg) and the connection is studied between pulsation parameters and parameters of the interplanetary medium. It is concluded that, in spite of differences in recording and processing, the results are similar and confirm earlier suppositions about these connections. Hypotheses about the location of the excitation clearly favour the pre-shock interplanetary medium with reflected protons counterstreaming to the solar wind. Propagation through the shock wave and the magnetopause, as well as infra-magnetospheric propagation, may later alter certain parameters of the pulsations. (author)

[en] We develop a form factor bootstrap program to determine the matrix elements of local, boundary condition changing operators. We propose axioms for these form factors and determine their solutions in the free boson and Lee–Yang models. The sudden change in the boundary condition, caused by an operator insertion, can be interpreted as a local quench and the form factors provide the overlap of any state before the quench with any outgoing state after the quench.

[en] We provide explicit expressions for boundary form factors in the boundary scaling Lee–Yang model for operators with the mildest ultraviolet behavior for all integrable boundary conditions. The form factors of the boundary stress tensor take a determinant form, while the form factors of the boundary primary field contain additional explicit polynomials

[en] We developed the theory of finite volume form factors in the presence of integrable defects. These finite volume form factors are expressed in terms of the infinite volume form factors and the finite volume density of states and incorporate all polynomial corrections in the inverse of the volume. We tested our results, in the defect Lee–Yang model, against numerical data obtained by truncated conformal space approach (TCSA), which we improved by renormalization group methods adopted to the defect case. To perform these checks we determined the infinite volume defect form factors in the Lee–Yang model exactly, including their vacuum expectation values. We used these data to calculate the two point functions, which we compared, at short distance, to defect CFT. We also derived explicit expressions for the exact finite volume one point functions, which we checked numerically. In all of these comparisons excellent agreement was found