Fine Structures of an EUV Wave Event from Multi-viewpoint Observations

SUMER observations of transition region fine structures

The SUMER (Solar Ultraviolet Measurements of Emitted Radiation) instrument on SOHO (Solar and Heliospheric Observatory) provides an opportunity to observe and study the solar transition region with high spatial and spectral resolution. We present new evidence to confirm that the emission from the quiet Sun at 2 × 105 K is dominated by cool loop-like fine structures which cluster across the chro...

EURD Observations of EUV Nightime Airglow Lines

The extreme ultraviolet (EUV) airglow has yet to be studied extensively due to observational difficulties in this range of the spectrum. EURD is an instrument designed to study diffuse EUV radiation flown on the Spanish MINISAT-01 satellite. In this paper we present observations of the terrestrial night airglow as observed from EURD in the range of 400 to 1060 Å. The high sensitivity and high r...

The Permissibility of Women’s Social Presence from an Islamic Viewpoint

This article tries to demonstrate that Islam recognizes women’s social presence and endorses their participation in political, economic, and cultural activities in society. The claim is supported by the Quranic reports of women’s social activities in the past nations and by a number of jurisprudential verses (āyāt al-aḥkām) pertaining to social matters. Further evidence for th...

Some Applications of Semidefinite Optimization from an Operations Research Viewpoint

Evidence of Plasma Resonance Instability from Observations of Solar Decimetric Fine Structures

The solar radio emissions in the decimetric frequency range (above 1000 MHz) are very rich in temporal and/or spectral fine structures. The Brazilian Solar Spectroscope (BSS) at INPE started operating in 1998. Since then, various types of fine structures, in the frequency range of (1000-2500) MHz, with high time and frequency resolutions have been recorded. The observed bursts include dot-like ...