We investigate reactions to sunspots in a bank-run game in a controlled laboratory environment. The sunspot variable is a series of random public announcements predicting withdrawal outcomes. The treatment variable is the coordination parameter, defined as the minimum fraction of depositors required to wait so that waiting entails a higher payoff than withdrawing. We conduct treatments with hig...

We study the latitudinal distribution and temporal evolution of sunspot penumbra-umbra ratio (q) for even odd Solar Cycles 12-24 RGO groups, SC21-SC24 Debrecen groups Kodaikanal dataset SC16-SC24. find that (odd) have q-values 5.20 (4.75), cycles 5.27 (5.43), has q-value 5.74 on average. also show q is at lowest around Equator Sun increases towards higher latitudes having maximum values about 1...

Abstract The year 1618 was once regarded as a minimum of the first observed solar cycle or even beginning extended Maunder minimum. However, new results from annual dataset radiocarbon (Usoskin et al., Astron. Astrophys. 649 , A141, 2021) shows that 1620 minimum, instead 1618. We revisited sunspot activity in historical records naked-eye observations (HRNSOs) China, daily telescopic were found ...

Correlated equilibria in strategic market games played, simultaneously, by “overlapping generations” of players correspond to sunspot equilibria in the associated, competitive economy. The lower the degree of competition, the larger the range of parameters that allow for effective correlation or endogenous stochastic fluctuations.

We examine a general equilibrium model with collateral constraints and increasing returns to scale in production. The utility function is nonseparable, with no income e¤ect on the consumer’s choice of leisure. Unlike this model without a collateral constraint, we …nd that indeterminacy of equilibria is possible. Hence, business cycles can be driven by self-ful…lling expectations. This is the ca...

Solar activity in all its varied manifestations is driven by the magnetic field. Two global quantities are particularly important for many purposes, Sun’s total and open flux, which can be computed from sunspot number records using models. Such sunspot-driven models, however, do not take into account presence of flux during grand minima, such as Maunder minimum. Here we present a major update w...

Direct seismic imaging of sub-surface flow, sound-speed and magnetic field is crucial for predicting flux tube emergence on the solar surface, an important ingredient space weather. The sensitivity helioseismic mode-amplitude cross-correlation to $p$- $f$-mode oscillations enable formal inversion such sub-photospheric perturbations. It well-known that problems are written in form integral equat...

The eeect of line overlap (blending) on broadband linear (NLP) and circular (NCP) polarisation in spectra of solar magnetic regions , especially sunspot umbrae, is explored in a systematic way, employing spectrum synthesis in polarised light on a grand scale over thousands of Angstrr oms. An extensive grid of theoretical Stokes IQU V spectra allows the discussion of the dependence of NLP and NC...

This paper proves that, in a general financial model with incomplete markets, the multiplicity of certainty equilibria is not necessary for the existence of sunspot effects. These effects are present, by definition, when real economic variables differ across realizations of extrinsic uncertainty. In a financial model of incomplete markets with identical payouts across realizations of extrinsic ...