Results 31 to 40 of about 21,184 (273)
Digitization of sunspot drawings by Sp\"orer made in 1861-1894 [PDF]
, 2014 Most of our knowledge about the Sun's activity cycle arises from sunspot observations over the last centuries since telescopes have been used for astronomy. The German astronomer Gustav Sp\"orer observed almost daily the Sun from 1861 until the beginning
Arlt, Rainer +2 more
core +1 more source
Economic Theory, 2003 This paper shows new properties about the equilibria of a stationary OG economy by establishing a connection between its stationary equilibria and those of a finite economy, with and without extrinsic uncertainty. Specifically, it shows the countability and local uniqueness with respect to the sup metric of the so-called sunspot cycles introduced here,
openaire +3 more sources
Advanced Materials Interfaces, EarlyView.Nanozymes (NZs) have emerged as versatile artificial enzymes with tunable catalytic properties driven by atomic coordination, defect engineering, and surface chemistry. This review presents a bio–nano interface framework linking synthesis strategies, structural design, and catalytic behavior within complex biological microenvironments.
Karen Guadalupe Quintero‐Garrido +6 more
wiley +1 more source
Differential Rotation of Individual Sunspots and Pores
The Astrophysical JournalThe analysis of the rotation rate of individual sunspots and pores was performed according to the data from the processing of observations by the Solar Dynamics Observatory/Helioseismic and Magnetic Imager in the period 2010–2024.
Andrey G. Tlatov, Kseniya A. Tlatova
doaj +1 more source
, 2008 By analyzing numerically simulated solar oscillation data, we study the influence of non-uniform distribution of acoustic wave amplitude, acoustic source strength, and perturbations of the sound speed on the shifts of acoustic travel times measured by ...
Kosovichev, Alexander G. +2 more
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On the surface structure of sunspots [PDF]
, 2012 A precise knowledge of the surface structure of sunspots is essential to construct adequate input models for helioseismic inversion tools. We summarize our recent findings about the velocity and magnetic field in and around sunspots using HINODE ...
Franz, Morten
core +1 more source
Advanced Science, EarlyView.This study identifies the HDAC6/GATA4/HtrA1 axis as a critical driver of cellular senescence in the inner ear. GATA4 nuclear translocation, facilitated by HDAC6 downregulation, transcriptionally activates HtrA1, promoting hair cell senescence, SASP, and audio‐vestibular dysfunction in models of Ménière's disease and age‐related audio‐vestibular ...
Na Zhang +16 more
wiley +1 more source
Propagation Properties of Sunspots Umbral Oscillations in Horizontal and Vertical Directions
The Astrophysical Journal, 2023 We present a study on investigating the propagation characteristics of umbral oscillations in sunspots. In sunspot 1 (located in NOAA AR 12127) with four umbrae, the analysis shows that the oscillations in different umbrae are correlated.
Wei Wu +4 more
doaj +1 more source
The Sunspot Cycle: Teacher's Guide [PDF]
In this activity, students investigate the change in the number of sunspots over a period of time. They will discover the appearance, origins, and magnetic properties of sunspots.
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Properties of sunspots in cycle 23: I. Dependence of brightness on sunspot size and cycle phase [PDF]
, 2007 In this paper we investigate the dependence of umbral core brightness, as well as the mean umbral and penumbral brightness on the phase of the solar cycle and on the size of the sunspot.
Albregtsen +35 more
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