The Lyrids meteor stream has a medium activity and its origin is cometary. Their parent body is the comet Thatcher, that passed the last time near Earth in 1861. The stream occurs in the last days of April and the maximum of activity occurs in the days from 21 to 23 April. The Lyrids were studied from 1994 to 2004 using two different techniques: visual and radio observation. The visual data were taken from the internet archive of International Meteor Organization. The analysis's procedure follows in part the indication of this Organization. The radio data were obtained using the meteor scatter techniques. The data were taken from the Radio Meteor Observation Bullettins. The purpose of this analysis is the definition of main characteristics of the stream. The solar longitude of the maximum of the activity is 32.2° ± 0.2° from radio data and 32.2° ± 0.1° from visual data. The ZHR during the maximum is 25 ± 3 and medium ZHR is 13 ± 1. The data show the evidence of a complexity in the structure of the spatial distribution of matter and no evidence of periodicities in the activity.

Astronomia UAI, 6, 21-27 (novembre-dicembre 2006)

The Lyrids meteor stream has a medium activity and its origin is cometary. Their parent body is the comet Thatcher, that passed the last time near Earth in 1861. The stream occurs in the last days of April and the maximum of activity occurs in the days from 21 to 23 April. The Lyrids were studied from 1994 to 2004 using two different techniques: visual and radio observation. The visual data were taken from the internet archive of International Meteor Organization. The analysis's procedure follows in part the indication of this Organization. The radio data were obtained using the meteor scatter techniques. The data were taken from the Radio Meteor Observation Bullettins. The purpose of this analysis is the definition of main characteristics of the stream. The solar longitude of the maximum of the activity is 32.2° ± 0.2° from radio data and 32.2° ± 0.1° from visual data. The ZHR during the maximum is 25 ± 3 and medium ZHR is 13 ± 1. The data show the evidence of a complexity in the structure of the spatial distribution of matter and no evidence of periodicities in the activity.

Astronomia UAI, 6, 21-27 (novembre-dicembre 2006)

In the present job they come introduced a series of didactic experiences inherent the topic of radio astronomy. Such experiences are enclosed in an handbook, that is freely downloadable and usable. These experiments could be used from amateur for their personal knowledge to make at home or from teachers for their didactic activity in a school. The activities proposed in this first job are six and spaces describing radioastronomical concepts, like the interference and the resolution, to comprising radioastronomical techniques, like the creation of radio maps or the analysis of the Moon or the star and radiogalaxies classification, in order to reach to measure the age of our Universe. In the present job they come introduced a series of didactic experiences inherent the topic of radio astronomy. Such experiences are enclosed in an handbook, that is freely downloadable and usable. These experiments could be used from amateur for their personal knowledge to make at home or from teachers for their didactic activity in a school. The activities proposed in this first job are six and spaces describing radioastronomical concepts, like the interference and the resolution, to comprising radioastronomical techniques, like the creation of radio maps or the analysis of the Moon or the star and radiogalaxies classification, in order to reach to measure the age of our Universe.

Astronomia UAI, 3, 34-36 (maggio-giugno 2010)

GMeteor is a project with the scope to create a kit for the monitoring of the meteoric impacts in atmosphere. They come introduced the main characteristics of the hardware with the characteristics of the receiver in function of the better waveband. Moreover they come shown the peculiarities of the software in phase of development acted to acquire and subsequently to elaborate the data. The data will be able to come use for several researches and analysis, like the rate-time graph or the mass index or in order to evidence the mesospheric ozone concentration.

Astronomia UAI, 6, 18-19 (luglio-agosto 2007)

The Eta Aquarids meteor stream has a medium activity and its origin is cometary. The stream occurs in the first days of May and the maximum of activity occurs in the day 5 for visual and 7 for radar observations. The Eta Aquarids were studied from 2004 to 2008 using radio observations. The radio data were obtained using the meteor scatter techniques. The activity of the stream has been analyzed using the method SVB. This method allows to separate from the observed datas the sporadic activity and the observability function of the forward-scatter apparatus and from these to obtain the true activity of the stream. The data were taken from the Radio Meteor Observation Bullettins. The purpose of this analysis is the definition of the main characteristics of the stream. The solar longitude of the maximum of the activity is 45.8° ± 0.2°.

Astronomia UAI, 3, 27-33 (maggio-giugno 2010)

The purpose of this work is to obtain the curve of rotation of the Milky Way, to map the spiral structure of the Galaxy itself and to determine the integral mass; all this is done through the study of the galactic hydrogen concentration. We used the radio telescope Salsa Onsala "Vale", a device with the diameter of 2.3 m built by the Onsala Space Observatory at the Chalmers University of Technology in Sweden. The data which were used refer to several observations done between December 22nd 2011 and January 6th 2012. For the elaboration of those data, which were the spectrum of the radiation, the software SalsaJ was used. The result of this study confirms that the matter velocity, far away from the galactic center, does not decrease, but remains the same. The distribution of the hydrogen is not uniform: it is concentrated in filamentary structures which are considered an evidence of the presence of a spiral structure.

Astronomia UAI, 4, 44-51 (luglio-agosto 2013)

Project CLEA (Contemporary Laboratory Experiences in Astronomy) develops laboratory exercises that illustrate modern astronomical techniques using digital data and color images. They are suitable for high-school and college classes at all levels. Project CLEA puts to disposition of the didactic instruments dedicates to the radio astronomy. Two are the specific programs in this sense: Radio astronomy of pulsars and The rotation of Mercury by Doppler effect. For everyone they will come described to the peculiarities, the didactic fine and the procedures for the obtaining of meaningful measures. The described procedures do not differ minimally from the usual calculations carry out to you from astronomers. The didactic aspect is interlaced with the peculiarities of the official research.

Astronomia UAI, 6, 41-45 (luglio-agosto 2007)

The aim of this work are firstly to obtain the curve of rotation of the Milky Way, secondly to map the spiral structure of the Galaxy in the I and II quadrant with a thin division and thirdly to determine the integral mass of the Galaxy. All these researches have been done through the study of the galactic hydrogen concentration. The data obtained by the radio telescope Salsa Onsala in Sweden refer to several observations done between December 2012 and April 2013. For the elaboration of those data, which were the spectrum of the radiation, the software SalsaJ was used. The result of this study confi rms that the matter velocity, far away from the galactic center, instead of decreasing remains the same. The distribution of the hydrogen is not uniform: it is concentrated in fi lamentary structures, which are considered an evidence of the presence of a spiral structure. Finally the mass of the Galaxy is comparable to the results of historical data.

Astronomia UAI, 4, 16-22 (luglio-agosto 2016)

The Lyrids meteor stream has a medium activity and itsorigin is cometary. The stream occurs in the last days of April and the maximum of activity occurs in the days 22-23 April. The Lyrids were studied in 2007 using radio observations. The radio data were obtained using the meteor scatter techniques. The activity of the stream has been analyzed using the method SVB. This method allows to separate from the observed datas the sporadic activity and the observability function of the forward-scatter apparatus and from these to obtain the true activity of the stream. The data were taken from the Radio Meteor Observation Bullettins. The purposeof this analysis is the definition of the main characteristics of the stream. The solar longitude of the maximum of the activity is 32.4° ± 0.2°.

Astronomia UAI, 5, 12-15 (settembre-ottobre 2008)

Project CLEA develops laboratory exercises that illustrate modern astronomical techniques using digital data and color images. The lab software contains a variety of optical telescopes of various apertures, equipped with photometer, spectrometer, and a CCD camera capable of taking images and saving them as FITS files for analysis. It also includes a radio telescope capable of recording incoming signals at three separate frequencies. The dataset for this exercise is a subset a more VIRTUAL EDUCATIONAL OBSERVATORY (VIREO) which includes over 15 million objects covering the entire sky. Like the all-sky dataset, the data supplied with the OBJECT X lab includes stars, galaxies, quasars, asteroids, and pulsars in several areas of the sky.

Astronomia UAI, 5, 16-20 (settembre-ottobre 2008)