An extraordinary increase in cosmic-ray intensity has been recorded on September 29, 1989 by the Rome detectors (rigidity threshold approximately 6.2 GV). We show the time evolution of the event as recorded at Rome in the nucleonic component and in the total ionizing and muon components; as well as at Campo Imperatore (2300 m a.s.l. near Rome) in the nucleonic component by a special monitor designed for the detection of solar-neutron events. The one-minute time resolution of the Campo Imperatore data offers the possibility to follow in detail the development of the event for most of the time. The possible contribution of solar neutrons to the early phase of the Campo Imperatore event has been not clarified so far, further results may be obtained by the analysis of the multiplicity data registered in the event.
THE GROUND-LEVEL COSMIC-RAY EVENT OF SEPTEMBER 29, 1989 AS RECORDED BY THE ROME DETECTORS / M., Alessio; L., Allegri; Fargion, Daniele; S., Improta; N., Iucci; M., Parisi; G., Villoresi; N. L., Zangrilli. - In: LA RIVISTA DEL NUOVO CIMENTO DELLA SOCIETÀ ITALIANA DI FISICA. - ISSN 0393-697X. - STAMPA. - 14:1(1991), pp. 53-60. [10.1007/bf02509257]
THE GROUND-LEVEL COSMIC-RAY EVENT OF SEPTEMBER 29, 1989 AS RECORDED BY THE ROME DETECTORS
FARGION, Daniele;
1991
Abstract
An extraordinary increase in cosmic-ray intensity has been recorded on September 29, 1989 by the Rome detectors (rigidity threshold approximately 6.2 GV). We show the time evolution of the event as recorded at Rome in the nucleonic component and in the total ionizing and muon components; as well as at Campo Imperatore (2300 m a.s.l. near Rome) in the nucleonic component by a special monitor designed for the detection of solar-neutron events. The one-minute time resolution of the Campo Imperatore data offers the possibility to follow in detail the development of the event for most of the time. The possible contribution of solar neutrons to the early phase of the Campo Imperatore event has been not clarified so far, further results may be obtained by the analysis of the multiplicity data registered in the event.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
