On the R z -sunspot relative number variations     

M. R. Attolini  M. Galli  G. Cini Castagnoli 《Solar physics》1985,95(2):391-395

The Zürich sunspot relative number R _z series has been analysed by the cyclogram method. The amplitude and the frequency variations of the Fourier 11 yr component between 1700–1983 A.D., were determined in a continuous way.Four distinct time intervals with significantly different characteristics of the periodicities are observed and discussed.Their second harmonics are also considered. The periodicity changes are contemporary to those of the 11 yr cycles.Around the year 1903 it seems that an important event has happened in the Sun. In fact the 11.4 yr cycle periodicity, that was very stable since at least 1825 started to change gradually to smaller values and similarly it happened to the second harmonic which also stopped and abruptly changed of phase of 90°.  相似文献   

Search for low energyν e,μ,τ andv e,μ,τ in coincidence with BATSE gamma ray bursts     

M. Aglietta  P. Antonioli  G. Badino  G. Bologna  C. Castagnoli  A. Castellina  V. L. Dadykin  W. Fulgione  P. Galeotti  F. F. Khalchukov  E. V. Korolkova  P. V. Kortchaguin  V. B. Kortchaguin  V. A. Kudryavtsev  A. S. Malguin  L. Periale  V. G. Ryassny  O. G. Ryazhskaya  O. Saavedra  G. Trinchero  S. Vernetto  C. Vigorito  V. F. Yakushev  G. T. Zatsepin 《Astrophysics and Space Science》1995,231(1-2):355-358

A search for low energy neutrinos of all flavours in correlation with 553 ray bursts detected by BATSE aboard the Compton Observatory has been performed by the LSD (Liquid Scintillator Detector) neutrino telescope. No excess ofe,, orv _e,, candidate has been detected by LSD during the time interval in which BATSE detected the 90% of the photon flux for any of the GRBs analyzed. Upper limits on the neutrino fluxes are given in the paper.  相似文献   

Solar activity in the last millennium recorded in the δ18O profile of planktonic foraminifera of a shallow water Ionian Sea core     

Castagnoli  G. Cini  Bonino  G.  Della Monica  P.  Taricco  C.  Bernasconi  S.M. 《Solar physics》1999,188(1):191-202

In this paper we present the ¹⁸O profile of Globigerinoides ruber measured in the GT90/3 shallow water Ionian sea core, dated with high precision. The ¹⁸O profile covers the period 1200–1900 AD, with a resolution of 3.87 years. This long record of 700 years of ¹⁸O allows us to identify the imprint of the solar cycle in a climatic record. In fact, the spectral analysis of the time series performed with different methods shows a dominant periodicity of about 11 years with an amplitude of 0.07. The signal is in opposition to the sunspot number cycle. This component is identified at a high significance level by Monte Carlo Singular Spectrum Analysis (MC-SSA).  相似文献   

On the solar origin of the thermoluminescence profile of the GT14 core   总被引：3，自引：0，他引：3  

G. Cini Castagnoli  G. Bonino  A. Provenzale  M. Serio 《Solar physics》1990,127(2):357-377

The thermoluminescence (TL) profile of the GT14 Ionian Sea core has been recently analyzed in connection with other records of solar activity. Phenomenological similarities among the TL profile, the radiocarbon record in tree-rings and the variations of the mean anuual sunspot number R _z suggest a solar control of the TL signal. In this paper we consider new readings of the TL profile of the GT14 core which were obtained at different glow temperatures. While the main spectral peaks discussed in previous papers are observed in all readings, a few new significant periodic components may now be separated from the noise background. Among these, a strong 22 yr (Hale) cycle is evident, together with a periodicity of 28.5 yr which has already been detected in the spectrum of the sunspot number series. We finally test the temporal persistency of the main TL periodic components by using a cyclogram method and we explore the effects of background noise by considering the TL profile of bleached samples.  相似文献   

Solar magnetic and bolometric cycles recorded in sea sediments   总被引：1，自引：0，他引：1  

G. Cini Castagnoli  G. Bonino  C. Taricco 《Solar physics》1994,152(1):309-312

The total carbonate and thermoluminescence (TL) profiles of the GT89-3 Ionian sea sediment core have been measured in the upper 200 cm of the core spanning the last 3100 years in order to test the presence of the Gleissberg (80–90 yr) cycle in the two different time series recorded in the same archive. Two different sampling intervals respectively of 2.5 mm and 2 mm have been chosen for the measurements in order to obtain results independent from sampling effects in the time series. We have revealed the Gleissberg cycle at 83 and 92 yr in both records.  相似文献   

Neutrino bursts and gravitational waves experiments     

C. Castagnoli  P. Galeotti  O. Saavedra 《Astrophysics and Space Science》1978,55(2):511-513

Several experiments have been performed in many countries to observe gravitational waves or neutrino bursts. Since their simultaneous emission may occur in stellar collapses, we evaluate the effect of neutrino bursts on gravitational wave antennas and suggest the usefulness of a time correlation among the different detectors.  相似文献   

Solar and galactic cosmic‐ray records of the Fermo (H) chondrite regolith breccia     

G. Bonino  N. Bhandari  S. V. S. Murty  R. R. Mahajan  K. M. Suthar  A. D. Shukla  P. N. Shukla  G. Cini Castagnoli  C. Taricco 《Meteoritics & planetary science》2001,36(6):831-839

Abstract— ‐We demonstrate the presence of solar flare as well as neutron capture effects in the isotopic composition of rare gases in the Fermo regolith breccia acquired on its parent body based on the measurements of tracks, rare gases and radionuclides. The track density along a 3.2 cm long core decreases by a factor of about 6 and by more than a factor of 13 within the meteorite, indicating small (2–9 cm) and asymmetrical ablation. Rare gases show a large trapped component; the isotopic ratios, particularly ²⁰Ne/²²Ne ? 11 and ²⁰Ne/³⁶Ar = 10 are indicative of a solar component. The galactic cosmic‐ray exposure age is determined to be 8.8 Ma. Activities of a dozen radionuclides ranging in half‐life from 16 day ⁴⁸V to 0.73 Ma ²⁶Al are consistent with their expected production rates. Track, rare gas and radionuclide data show that the meteoroid was a small body (≤ 120 kg) and had a simple, one‐stage exposure history to cosmic rays in the interplanetary space. However, ⁸²Kr and ¹²⁸Xe show an excess due to neutron irradiation on the parent body of the meteorite. The presence of solar gases and the neutron capture effects indicate several stages of irradiation on the parent asteroid. The chemical composition of Fermo confirms that it belongs to the H group of ordinary chondrites with lithic clasts having varying compositions. δ¹⁵N is found to be 8.3 ± 1.2%0, close to the typical values observed in H chondrites.  相似文献   

Effects of active solar regions on the galactic cosmic ray intensity     

E. Antonucci  G. Cini Castagnoli  M. A. Dodero 《Solar physics》1971,20(2):497-506

During the year 1969 two long-lived centres were active on the Sun at Carrington longitudes 50° < L < 100° and 250° < L < 300°. About 80% of the flares of importance 1B, produced during this period, originated in these zones.The solar modulation of galactic cosmic ray intensity during 1969 was dominated by effects resulting from the activity in the two zones. In fact all the decreases can be related to the passage at the central meridian of the active centres. Persistence of the effects connected to solar regions is found also during rotations in which they do not produce flares in front of the Earth.Seventeen among the twenty-six intensity decreases, observed during this period, can also be correlated to individual flares belonging to the region at central meridian (longitudes ± 40° with respect to the CM).The data suggest that two phenomena are operative to produce decreases of the cosmic ray flux: the passage of the interplanetary corotating stream associated with the active region near the central meridian and the blast wave produced by the flares in front of the Earth.  相似文献   

Trajectory Studies of Polar Stratospheric Cloud Lidar Observations at Sodankylä (Finland) During SESAME: Comparison with Box Model Results of Particle Evolution     

V. Rizi  G. Redaelli  G. Visconti  F. Masci  C. Wedekind  B. Stein  F. Immler  B. Mielke  P. Rairoux  L. Woste  M. Del Guasta  M. Morandi  F. Castagnoli  S. Balestri  L. Stefanutti  R. Matthey  V. Mitev  M. Douard  J.P. Wolf  E. Kyro  M. Rummukainen  R. Kivi 《Journal of Atmospheric Chemistry》1999,32(1):165-181

Polar stratospheric clouds (PSC) were observed with the multi-wavelength lidar of the MOANA project (Modelling and Observations of Aerosols in the Northern Atmosphere) during SESAME (Second European Stratospheric Arctic and Mid-latitude Experiment). The physical state, liquid or solid, of the cloud particles can be inferred from the lidar data. Using isentropic back-trajectories to obtain the thermal history of the sampled air masses, it is possible to reconcile most of the observations with current ideas on PSC formation and evolution. When the cloud particles were identified as liquid, changes in the size distribution of the droplets along the trajectory were calculated using a micro-physical box model. Backscatter ratios calculated from the size distributions are in broad agreement with the lidar data, giving confidence in current understanding of the evolution of ternary solution (H2SO4, HNO3 and H2O) droplets.Results from two soundings are shown which bear on the problem of the formation of solid particles. In the first, solid particles were detected. The air mass had cooled to the frost point 12 hours earlier. In the second no solid particles were detected although the air temperature was below the nitric acid trihydrate existence point, and had decreased by 12K in the previous 14 hours.  相似文献   

The thermoluminescence profile of a recent sea sediment core and the solar variability   总被引：5，自引：0，他引：5  

G. Cini Castagnoli  G. Bonino  A. Provenzale 《Solar physics》1988,117(1):187-197

The analysis of the thermoluminescence (TL) profile of the GT14 recent sea sedimentary core shows the existence of four main periodicities of 137.7, 59,12.06, and 10.8 years. Here we discuss the affinity of these waves to the known cycles of solar variability. The beats of the two high frequency components produce a modulated wavetrain with a carrier wave of 11.4 years and an amplitude modulation with period 206 years. The minima of this squared amplitude modulation fall in 1810 and 1913 A.D. and closely correspond to the periods of lowest solar activity as indicated by the sunspot series. The sum of the two low frequency waves can in turn be rewritten as a component with period 82.6 years which is amplitude modulated by a second component with period of 206 years. The 82.6-yr wave has the period commonly attributed to the Gleissberg cycle of solar activity. The maxima of the 82.6-yr wave occur in agreement with the dates of maximum solar radius as suggested by Gilliland (1981).  相似文献