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THE PECULIAR EXTINCTION LAW OF SN 2014J MEASURED WITH THE HUBBLE SPACE TELESCOPE
The wavelength dependence of the extinction of Type Ia SN 2014J in the nearby galaxy M82 has been measured using UV to near-IR photometry obtained with the Hubble Space Telescope, the Nordic Optical…
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THE RISE OF SN 2014J IN THE NEARBY GALAXY M82
We report on the discovery of SN 2014J in the nearby galaxy M82. Given its proximity, it offers the best opportunity to date to study a thermonuclear supernova (SN) over a wide range of the…
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Broadening of Si VIII lines observed in the solar polar coronal holes
We study the variation of the line width and electron density as a function of height above two coronal holes from forbidden spectral lines of Si viii. The spectra were obtained with the Solar…
Signatures of Alfvén waves in the polar coronal holes as seen by EIS/Hinode
Context. We diagnose the properties of the plume and interplume regions in a polar coronal hole and the role of waves in the acceleration of the solar wind. Aims. We attempt to detect whether Alfven…
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Kodaikanal digitized white-light data archive (1921–2011): Analysis of various solar cycle features
Context. Long-term sunspot observations are key to understanding and predicting the solar activities and its effects on space weather. Consistent observations, which are crucial for long-term…
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FREQUENCY-DEPENDENT DAMPING IN PROPAGATING SLOW MAGNETO-ACOUSTIC WAVES
Propagating slow magneto-acoustic waves are often observed in polar plumes and active region fan loops. The observed periodicities of these waves range from a few minutes to a few tens of minutes and…
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Coronal line-width variations
Line-width measurements of the coronal ion Siviii confirm earlier observations which show an increase in the non-thermal velocity above the solar limb. The present data, taken at the equatorial limb,…
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VLTI monitoring of the dust formation event of the Nova V1280 Scorpii
Context. We present the first high spatial resolution monitoring of th e dust forming nova V1280 Sco performed with the Very Large Telescope Interferometer (VLTI). Aims. These observations aim at…
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Statistical Study of Network Jets Observed in the Solar Transition Region: a Comparison Between Coronal Holes and Quiet-Sun Regions
Recent IRIS observations have revealed a prevalence of intermittent small-scale jets with apparent speeds of 80–250kms−1$80\,\mbox{--}\,250~\mbox{km}\,\mbox{s}^{-1}$, emanating from small-scale…
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The expanding fireball of Nova Delphini 2013
TLDR
Near-infrared interferometric measurements of the angular size of Nova Delphini 2013 are reported, suggesting a prolate or bipolar structure that develops as early as the second day of the explosion, and a geometric distance to the nova of 4.54 ± 0.59 kiloparsecs from the Sun.
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