ALMA Solar Ephemeris Generator

An online software tool for the easy preparation of ephemerides of the solar surface features is presented. It was developed as a helper tool for the preparation of observations of the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA), but it can be used at other observatories as well. The tool features an easy to use point-and-click graphical user interface with the possibility to enter or adjust input parameters, while the result is a table of predicted positions in the celestial equatorial coordinate system, suitable for import into the ALMA Observing Tool software. The tool has been successfully used for the preparation and execution of solar observations with ALMA.Comment: Submitted to The Mining Geological Petroleum Engineering Bulletin (see https://www.scopus.com/sourceid/101730), 7 pages, 2 figure

Solar cycles: the past evolution influence

The so-called solar cycle is generally characterized by the quasi-periodic oscillatory evolution of the photospheric spots number. This quasi-periodic pattern has always been an intriguing question. Several physical models were proposed to explain this evolution and many mathematical data analysis were employed to determine the principal frequencies noticeable in the measured data. Both approaches try to predict the future evolution of the solar activity and to understand the physical phenomena producing these cycles. Here we present the analysis of the sunspots number evolution using the time-delay approach. Our results show than the solar cycle can also be characterized by this behavior implying the influence of the past evolution over the present one, suggesting an histeresis mechanism, linked probably with magnetic activity.Comment: Submitted to the proceedings of the IAU symposium No. 264, 200

Steps toward a high precision solar rotation profile: Results from SDO/AIA coronal bright point data

Coronal bright points (CBP) are ubiquitous small brightenings in the solar corona associated with small magnetic bipoles. We derive the solar differential rotation profile by tracing the motions of CBPs detected by the Atmospheric Imaging Assembly (AIA) instrument aboard the Solar Dynamics Observatory (SDO). We also investigate problems related to detection of coronal bright points resulting from instrument and detection algorithm limitations. To determine the positions and identification of coronal bright points we used a segmentation algorithm. A linear fit of their central meridian distance and latitude versus time was utilised to derive velocities. We obtained 906 velocity measurements in a time interval of only 2 days. The differential rotation profile can be expressed as $\omega_{rot} = (14.47\pm 0.10 + (0.6\pm 1.0)\sin^{2}(b) + (-4.7\pm 1.7)\sin^{4}(b))$\degr day$^{-1}$. Our result is in agreement with other work and it comes with reasonable errors in spite of the very short time interval used. This was made possible by the higher sensitivity and resolution of the AIA instrument compared to similar equipment as well as high cadence. The segmentation algorithm also played a crucial role by detecting so many CBPs, which reduced the errors to a reasonable level. Data and methods presented in this paper show a great potential to obtain very accurate velocity profiles, both for rotation and meridional motion and, consequently, Reynolds stresses. The amount of coronal bright point data that could be obtained from this instrument should also provide a great opportunity to study changes of velocity patterns with a temporal resolution of only a few months. Other possibilities are studies of evolution of CBPs and proper motions of magnetic elements on the Sun

Emocionalni život obitelji: roditeljske metaemocije, temperament djeteta i eksternalizirani i internalizirani problemi

The aim of this study was to investigate some assumptions related to Gottman\u27s model of parental meta-emotions on a sample of preschool children\u27s parents. The study included 506 parents. The questionnaires about parental meta-emotions, dimensions of temperament and children\u27s internalising and externalising problems were completed by mothers and fathers separately. Mothers\u27 and fathers\u27 awareness of their own and of their children\u27s emotions and coaching child emotions were indirectly related to child externalising and internalising problems through child negative affectivity and effortful control, and awareness was also directly related to the child\u27s externalising and internalising problems. The results of the models showed that mothers\u27 and fathers\u27 awareness and coaching were positively related to effortful control and negatively related to negative affectivity, whereas only mothers\u27 and fathers\u27 awareness were negatively related to externalising and internalising problems. Simultaneously, negative affectivity was positively related to the child\u27s externalising and internalising problems and effortful control was negatively related to the child\u27s externalising and internalising problems. With this study, we have confirmed part of the investigated assumptions from Gottman\u27s model that relate to the influence of parental meta-emotion on child outcomes.Cilj istraživanja bio je ispitati neke pretpostavke Gottmanova modela roditeljskih metaemocija na uzorku roditelja djece predškolske dobi. U istraživanju je sudjelovalo 506 roditelja. Upitnike o metaemocijama, dimenzijama temperamenta te dječjim internaliziranim i eksternaliziranim problemima ispunjavali su zasebno majka i otac. Majčina i očeva svjesnost vlastitih i dječjih emocija i postupanje s dječjim emocijama indirektno je povezana s dječjim eksternaliziranim i internaliziranim problemima preko dječje negativne afektivnosti i samokontrole a dodatno je svjesnost izravno povezana s dječjim internaliziranim i eksternaliziranim problemima. Rezultati dobivenih modela pokazuju da je majčina i očeva svjesnost vlastitih i dječjih emocija i postupanje s dječjim emocijama pozitivno povezana sa samokontrolom i negativno povezana s negativnom afektivnosti, dok je jedino majčina i očeva svjesnost vlastitih i dječjih emocija negativno povezana s eksternaliziranim i internaliziranim problemima. Istodobno, negativna je afektivnost pozitivno povezana s dječjim eksternaliziranim i internaliziranim problemima, a samokontrola je negativno povezana s dječjim eksternaliziranim i internaliziranim problemima. Ovim istraživanjem potvrdili smo dio pretpostavki iz Gottmanova modela kako roditeljske metaemocije utječu na dječje izlazne varijable

Are There Radio-quiet Solar Flares?

Some 15% of solar flares having a soft X-ray flux above GOES class C5 are reported to lack coherent radio emission in the 100 - 4000MHz range (type I - V and decimetric emissions). A detailed study of 29 such events reveals that 22 (76%) of them occurred at a radial distance of more than 800″ from the disk center, indicating that radio waves from the limb may be completely absorbed in some flares. The remaining seven events have statistically significant trends to be weak in GOES class and to have a softer non-thermal X-ray spectrum. All of the non-limb flares that were radio-quiet above 100MHz were accompanied by metric typeIII emission below 100MHz. Out of 201 hard X-ray flares, there was no flare except near the limb (R>800″) without coherent radio emission in the entire meter and decimeter range. We suggest that flares above GOES class C5 generally emit coherent radio waves when observed radially above the sourc