New Astronomy

Excitation rate coefficients K n;n+p (T ) (10 −9 cm 3 s −1 ) for (n − n ′ )-mixing processes in H ∗ (n) + H collisions

Association of CMEs with solar flares detected by Fermi γ-ray burst monitor during solar cycle 24

20120107EnLASCO_C2.avi: video of enhanced coronal images observed by LASCO/C2 on January 7, 2012. 20160101EnK-Cor.avi: video of enhanced coronal images observed by K-Cor on January 1, 2016.

Table 3: Catalog with astrometric and multiband photometric information for about 44600 objects in the region of IRAS 16571-4029 and 16575-4023 sources Table 4: Selected objects in the region of IRAS 16571-4029 source. Table 8: OB candidates in the region of IRAS 16575-4023 (B) source

The photometric data in BV bands for the eclipsing binary V737 Per.

Photometric data of ASAS J212234-4627.6 and ASAS J212319-4622.4 observed on Aug. 16 and Sep. 28, 2014 using the 0.6-m SARA telescope at the CTIO.

Total solar irradiance is the primary energy source of the Earth’s climate system and therefore its variations can contribute to natural climate change. This variability is characterized by, among other manifestations, decadal and secular oscillations, which has led to several attempts to estimate future solar activity. Of particular interest now is the fact that the behavior of the solar cycle 23 minimum has shown an activity decline not previously seen in past cycles for which spatial observations exist: this could be signalling the start of a new grand solar minimum. The estimation of solar activity for the next hundred years is one of the current problems in solar physics because the possible occurrence of a future grand solar minimum will probably have an impact on the Earth’s climate. In this study, using the PMOD and ACRIM TSI composites, we have attempted to estimate the TSI index from year 1000 AD to 2100 AD based on the Least Squares Support Vector Machines, which is applied here for the first time to estimate a solar index. Using the wavelet transform, we analyzed the behavior of the total solar irradiance time series before and after the solar grand minima. Depending on the composite used, PMOD (or ACRIM), we found a grand minimum for the 21st century, starting in 2004 (or 2002) and ending in 2075 (or 2063), with an average irradiance of 1365.5 (or 1360.5) Wm 2 1r 1⁄4 0:3 (or 0.9) Wm 2 . Moreover, we calculated an average radiative forcing between the present and the 21st century minima of 0:1 (or 0.2) Wm 2, with an uncertainty range of 0:04 to 0:14 (or 0:12 to 0:33) Wm 2. As an indicator of the TSI level, we calculated its annual power anomalies; in particular, future solar cycles from 24 to 29 have lower power anomalies compared to the present, for both models. We also found that the solar activity grand minima periodicity is of 120 years; this periodicity could possibly be one of the principal periodicities of the magnetic solar activity not so previously well recognized. The negative (positive) 120-year phase coincides with the grand minima (maxima) of the 11-year periodicity.

We present a new set of solar radiation forcing that now incorporated not only the gravitational perturbation of the Sun-Earth-Moon geometrical orbits but also the intrinsic solar magnetic modulation of the Total Solar Irradiance (TSI). This new dataset, covering the past 2000 years as well as a forward projection for about 100 years based on recent result by Velasco-Herrera et al. (2015, doi:10.1016/j.newast.2014.07.009), should provide a realistic basis to examine and evaluate the role of external solar forcing on Earth climate on decadal, multidecadal to multicentennial timescales. A second goal of this paper is to propose both in-situ insolation forcing variable and the latitudinal insolation gradients (LIG) as two key metrics that are subjected to a deterministic modulation by lunar nodal cycle which are often confused with tidal forcing impacts as assumed and interpreted in previous studies of instrumental and paleoclimatic records.

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