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1.
Solar Cycle Modulation of Cosmic Rays Observed with the Low Energy Modes of the Pierre Auger Observatory
Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, Jimmy Masías-Meza, 2015, objavljeni znanstveni prispevek na konferenci

Opis: The low energy modes of the surface detector array of the Pierre Auger Observatory record variations in the flux of low energy secondary particles with extreme detail. These two modes consist of recording (1) the rate of signals for energies between ∼15 MeV and ∼100 MeV (the Scaler mode) and (2) the calibration charge histograms of the individual pulses detected by each water-Cherenkov station, covering different energy channels up to ∼1 GeV (the Histogram mode). Previous work has studied the flux of galactic cosmic rays on short and intermediate time scales (i.e. from minutes to weeks) using these low energy modes. In this work, after including a long- term correction to the response of the detectors, we present the first long-term analysis of the flux of cosmic rays using scalers and two energy bands of the calibration histograms. We show its sensitivity to the solar cycle variation and its relation to the solar modulation of cosmic rays for an 8-year period.
Najdeno v: ključnih besedah
Ključne besede: Pierre Auger Observatory, Surface Detector, secondary cosmic rays, scaler mode, charge histogram mode, solar cycle modulation
Objavljeno: 03.03.2016; Ogledov: 3349; Prenosov: 166
.pdf Polno besedilo (533,18 KB)

2.
Two regimes in the regularity of sunspot number
M. Shnirman, Vincent Courtillot, Alexander Shapoval, Jean-Louis Le Mouël, 2013, izvirni znanstveni članek

Opis: Sunspot numbers WN display quasi-periodical variations that undergo regime changes. These irregularities could indicate a chaotic system and be measured by Lyapunov exponents. We define a functional λ (an "irregularity index") that is close to the (maximal) Lyapunov exponent for dynamical systems and well defined for series with a random component: this allows one to work with sunspot numbers. We compute λ for the daily WN from 1850 to 2012 within 4 yr sliding windows: λ exhibit sharp maxima at solar minima and secondary maxima at solar maxima. This pattern is reflected in the ratio R of the amplitudes of the main versus secondary peaks. Two regimes have alternated in the past 150 yr, R1 from 1850 to 1915 (large λ and R values) and R2 from 1935 to 2005 (shrinking difference between main and secondary maxima, R values between 1 and 2). We build an autoregressive model consisting of Poisson noise plus an 11 yr cycle and compute its irregularity index. The transition from R1 to R2 can be reproduced by strengthening the autocorrelation a of the model series. The features of the two regimes are stable for model and WN with respect to embedding dimension and delay. Near the time of the last solar minimum (~2008), the irregularity index exhibits a peak similar to the peaks observed before 1915. This might signal a regime change back from R2 to R1 and the onset of a significant decrease of solar activity.
Najdeno v: ključnih besedah
Povzetek najdenega: ...sliding windows: λ exhibit sharp maxima at solar minima and secondary maxima at solar maxima.... ...of Poisson noise plus an 11 yr cycle and compute its irregularity index. The transition...
Ključne besede: Lyapunov exponent, solar activity, solar cycle
Objavljeno: 19.04.2021; Ogledov: 735; Prenosov: 27
URL Polno besedilo (0,00 KB)
Gradivo ima več datotek! Več...

3.
Is a sudden increase of irregularity of sunspot numbers a precursor of a return to low solar activity?
M. Shnirman, Alexander Shapoval, Jean-Louis Le Mouël, Vincent Courtillot, 2014, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...solar cycle, sunspots, lifetime...
Ključne besede: solar cycle, sunspots, lifetime
Objavljeno: 19.04.2021; Ogledov: 719; Prenosov: 4
URL Polno besedilo (0,00 KB)
Gradivo ima več datotek! Več...

4.
When daily sunspot births become positively correlated
Alexander Shapoval, Jean-Louis Le Mouël, M. Shnirman, Vincent Courtillot, 2015, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ... solar cycle, sunspots, auto regressive process...
Ključne besede: solar cycle, sunspots, auto regressive process
Objavljeno: 19.04.2021; Ogledov: 725; Prenosov: 0
.pdf Polno besedilo (1,13 MB)

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