Mapping prominence plasma parameters from eclipse observations

AbstractUsing the eclipse observations, we construct the maps of quiescent prominence temperatures, electron densities, pressures and geometrical thicknesses. For this we use the RGB signal of prominence visible-light emission detected during the total solar eclipse on August 1, 2008 in Mongolia, and quasi-simultaneous Hα spectra taken at Ondřejov observatory. The method of disentangling the electron density and effective geometrical thickness was described by Jejčič & Heinzel (2009) and is used here for the first time to analyse the spatial variations of various prominence parameters.

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Iron antimonate quantum dots exhibiting tunable visible light emission

New Journal of Chemistry ◽

10.1039/c6nj02767a ◽

2017 ◽

Vol 41 (4) ◽

pp. 1436-1446 ◽

Cited By ~ 2

Author(s):

Pratanu Nag ◽

Partha Pratim Das ◽

Anurag Roy ◽

Parukuttyamma Sujatha Devi

Keyword(s):

Quantum Dots ◽

Visible Light ◽

Combustion Synthesis ◽

Light Emission ◽

Auto Combustion ◽

Iron Antimonate ◽

First Time ◽

Visible Light Emission

In this paper, we report for the first time tunable visible light emission from FeSbO4 quantum dots prepared by an auto-combustion synthesis, a property hitherto unknown for this oxide.

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Observation of the prominence cavity region using slitless eclipse flash spectra and space borne EUV filtergrams

Proceedings of the International Astronomical Union ◽

10.1017/s1743921313010892 ◽

2013 ◽

Vol 8 (S300) ◽

pp. 151-154

Author(s):

Cyrille Bazin ◽

Serge Koutchmy ◽

Philippe Lamy ◽

Ehsan Tavabi

Keyword(s):

Electron Density ◽

Plasma Density ◽

Solar Eclipse ◽

Intensity Ratio ◽

Radial Direction ◽

Hydrostatic Equilibrium ◽

Total Solar Eclipse ◽

First Time ◽

The Continuum

AbstractWe used total solar eclipse free of parasitic light for studying the prominence to corona interface, and the corresponding cavity in the context of the coronal physics. We analysed the visible continuum between the prominences to directly look at the electron density. We demonstrate some enhanced heating in the cavity region. Some similarities with the interface regions are shown: the photosphere to the chromosphere and the prominence to the corona interface. The optically thin neutral Helium at 4713 Å and the singly ionized Helium 4686 Å Paschen α lines are considered. We summed 80 slitless visible eclipse flash spectra that we compare with simultaneously obtained EUV SWAP/Proba2 174 Å images of ESA and AIA/SDO 171Å 193 Å 304 Å and 131 Å filtergrams. Intensity profiles in a radial direction are studied. We deduce the variation of the intensity ratio I(He I 4713) / I(He II 4686). Discussion: the temperature rises at the edge of the prominences. We evaluate for the first time with spectrophotometric accuracy the continuum modulations in prominence spectra. W-L intensity deficits are observed near the prominence boundaries in both eclipse spectra and in EUV images, confirming that the prominence -cavity regions correspond to a relative depression of plasma density of the surrounding corona. Conclusion: we demonstrate some enhanced heating occurring in these regions assuming hydrostatic equilibrium.

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Coronal Heating by MHD Waves: Results from the SECIS Instrument during the 1999 Eclipse

Symposium - International Astronomical Union ◽

10.1017/s0074180900219797 ◽

2001 ◽

Vol 203 ◽

pp. 467-470

Author(s):

K. J. H. Phillips ◽

P. T. Gallagher ◽

D. R. Williams ◽

F. P. Keenan ◽

P. Rudawy ◽

...

Keyword(s):

Visible Light ◽

Solar Eclipse ◽

Light Emission ◽

Imaging System ◽

Mhd Waves ◽

Ccd Cameras ◽

Preliminary Results ◽

Short Period ◽

A Site ◽

Visible Light Emission

We report on results from the Solar Eclipse Coronal Imaging System (SECIS), an instrument using fast CCD cameras designed to search for short-period modulations in visible-light emission from the corona during an eclipse or with a coronagraph. The instrument was successfully used during the total eclipse of 1999 August 11 from a site in Bulgaria. This paper summarizes both the instrument and preliminary results.

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Temperature sensitive optical properties of exciton and room-temperature visible light emission from disordered Cu2O nanowires

RSC Advances ◽

10.1039/c4ra05595k ◽

2014 ◽

Vol 4 (71) ◽

pp. 37542-37546 ◽

Cited By ~ 6

Author(s):

Peng Wang ◽

Xinhong Zhao ◽

Hairong Li ◽

Lingshan Li ◽

Jing Li ◽

...

Keyword(s):

Optical Properties ◽

Visible Light ◽

White Light ◽

Room Temperature ◽

Light Emission ◽

Temperature Sensitive ◽

Excitonic Emission ◽

First Time ◽

Visible Light Emission

The excitonic emission of the Cu2O nanowires are demonstrated, and a visible white light is observed for the first time.

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Scanning luminescence x-ray microscopy: Progress toward selective staining using microspheres

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100168104 ◽

1994 ◽

Vol 52 ◽

pp. 74-75

Author(s):

C. Jacobsen ◽

J. Fu ◽

S. Mayer ◽

Y. Wang ◽

S. Williams

Keyword(s):

Visible Light ◽

Active Sites ◽

Light Emission ◽

Chinese Hamster ◽

Polystyrene Spheres ◽

Good Resistance ◽

X Ray ◽

Selective Staining ◽

Visible Light Emission ◽

Specific Labelling

In scanning luminescence x-ray microscopy (SLXM), a high resolution x-ray probe is used to excite visible light emission (see Figs. 1 and 2). The technique has been developed with a goal of localizing dye-tagged biochemically active sites and structures at 50 nm resolution in thick, hydrated biological specimens. Following our initial efforts, Moronne et al. have begun to develop probes based on biotinylated terbium; we report here our progress towards using microspheres for tagging.Our initial experiments with microspheres were based on commercially-available carboxyl latex spheres which emitted ~ 5 visible light photons per x-ray absorbed, and which showed good resistance to bleaching under x-ray irradiation. Other work (such as that by Guo et al.) has shown that such spheres can be used for a variety of specific labelling applications. Our first efforts have been aimed at labelling ƒ actin in Chinese hamster ovarian (CHO) cells. By using a detergent/fixative protocol to load spheres into cells with permeabilized membranes and preserved morphology, we have succeeded in using commercial dye-loaded, spreptavidin-coated 0.03μm polystyrene spheres linked to biotin phalloidon to label f actin (see Fig. 3).

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