THE FIRST MEASUREMENTS OF THE MAGNETIC FIELD AND DIFFERENTIAL VELOCITY WITH MODULATIONLESS METHOD

摘要

In this communication we consider the modula-tionless method for measuring the magnetic field strength and the differential line-of-sight velocity, based on using a diffraction spectrograph and multichannel CCD-photodetectors. The method is currently under development at the ISTP. It becomes possible to measure the longitudinal magnetic field strength and the differential line-of-sight velocity in a single exposure. This can be attractive when reducing the influence of atmospheric instabilities on the result of magnetic field measurement using CCD arrays. The variable optical system, which we are using, permits us to make magnetic field measurements in the lambda-meter mode, which alleviates significantly the procedure of calibration of observational data. The results of the first measurements performed in the modulationless mode are presented.