Repozitorij Univerze v Novi Gorici

Iskanje po repozitoriju
A+ | A- | Pomoč | SLO | ENG

Iskalni niz: išči po
išči po
išči po
išči po
* po starem in bolonjskem študiju

Opcije:
  Ponastavi


1 - 8 / 8
Na začetekNa prejšnjo stran1Na naslednjo stranNa konec
1.
Influence of very large spatial heterogeneity on estimates of sea-level trends
M. Shnirman, Vincent Courtillot, Alexander Shapoval, Jean-Louis Le Mouël, 2020, izvirni znanstveni članek

Opis: We propose a new method to estimate sub-decadal to centennial time scales of sea-level change. Since the coastal data exhibit large spatial heterogeneity and temporal variability, the global sea-level rate is estimated as an appropriate average of the rates observed at available locations and computed with sliding windows. We claim that under such heterogeneity the median serves as a better representative of an adequate average than the mean. With this approach, the sea-level rate in 60 to 70 yr windows over the past century is found to be smaller than 1.7-1.9 mm/yr. These upper estimates are in line with those obtained with a scarce list of available long quasi-gapless series
Najdeno v: osebi
Ključne besede: sea-level rise, median, sliding window, statistically significant trend
Objavljeno: 16.03.2021; Ogledov: 915; Prenosov: 0
.pdf Polno besedilo (1,62 MB)

2.
Observational evidence in favor of scale-free evolution of sunspot groups
Alexander Shapoval, Jean-Louis Le Mouël, M. Shnirman, Vincent Courtillot, 2018, izvirni znanstveni članek

Najdeno v: osebi
Ključne besede: sunspots, sun, magnetic fields, data analysis
Objavljeno: 23.03.2021; Ogledov: 1047; Prenosov: 36
.pdf Polno besedilo (451,74 KB)
Gradivo ima več datotek! Več...

3.
Dynamics of sunspot series on time scales from days to years
Jean-Louis Le Mouël, M. Shnirman, Vincent Courtillot, Alexander Shapoval, 2017, izvirni znanstveni članek

Najdeno v: osebi
Ključne besede: sunspots series, average lifetime, average birthrate, data analysis
Objavljeno: 30.03.2021; Ogledov: 1020; Prenosov: 38
.pdf Polno besedilo (1,52 MB)
Gradivo ima več datotek! Več...

4.
5.
When daily sunspot births become positively correlated
Alexander Shapoval, Jean-Louis Le Mouël, M. Shnirman, Vincent Courtillot, 2015, izvirni znanstveni članek

Najdeno v: osebi
Ključne besede: solar cycle, sunspots, auto regressive process
Objavljeno: 19.04.2021; Ogledov: 840; Prenosov: 0
.pdf Polno besedilo (1,13 MB)

6.
Stochastic description of the high-frequency content of daily sunspots and evidence for regime changes
Vincent Courtillot, Alexander Shapoval, Jean-Louis Le Mouël, M. Shnirman, 2015, izvirni znanstveni članek

Najdeno v: osebi
Ključne besede: chaos, solar activity, sunspots
Objavljeno: 19.04.2021; Ogledov: 815; Prenosov: 36
URL Polno besedilo (0,00 KB)
Gradivo ima več datotek! Več...

7.
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: osebi
Ključne besede: solar cycle, sunspots, lifetime
Objavljeno: 19.04.2021; Ogledov: 821; Prenosov: 8
URL Polno besedilo (0,00 KB)
Gradivo ima več datotek! Več...

8.
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: osebi
Ključne besede: Lyapunov exponent, solar activity, solar cycle
Objavljeno: 19.04.2021; Ogledov: 859; Prenosov: 33
URL Polno besedilo (0,00 KB)
Gradivo ima več datotek! Več...

Iskanje izvedeno v 0 sek.
Na vrh