Philip Judge

Spectroscopy and atomic physics

the solar spectrum
Friday, May 4, 2018

A short guide to spectroscopy is given, with emphasis upon the elementary physics needed to understand and begin modeling the radiation emerging from astrophysical plasmas using the Sun as a guide, without bias towards a particular region of the Sun's atmosphere.

Discovery of New Coronal Lines at 2.843 & 2.853 Microns

Summary of AIR-Spec observations during totality
Tuesday, February 20, 2018

Jenna Samra and Philip Judge identify two new emission features observed during the 21st August 2017 total solar eclipse by a novel spectrometer, AIR-Spec, flown at 14.3 km altitude aboard the NCAR Gulfstream V aircraft.

P Judge and R Casini Advise Early Career Researchers

Roberto Casini and Philip Judge image

Physics World presents an article co-authored by HAO senior scientists, Philip Judge and Roberto Casini, on the challenges for the "budding research scientist" when selecting a meaningful research field and future career.

Efficient Radiative Transfer for Dynamically Evolving Stratified Atmospheres

Static FALC model.
Friday, August 25, 2017

Language Summary or Abstract: We present a fast multi-level and multi-atom non-LTE radiative transfer method for dynamically evolving stratified atmospheres, such as the solar atmosphere. The preconditioning method of Rybicki & Hummer (RH92) is adopted.

An Explanation of Remarkable Emission Line Profiles In Post-Flare Coronal Rain

Intensity profiles of the Mg II h and k lines
Tuesday, August 8, 2017

We study broad red-shifted emission in chromospheric and transition region lines that appears to correspond to a form of post-flare coronal rain.

Vector Magnetic Field Measurements Along A Cooled Stereo-Imaged Coronal Loop

Observed and inverted Stokes spectra
Tuesday, August 8, 2017

The variation of the vector magnetic field along structures in the solar corona remains unmeasured. 

Atomic Physics and Modern Solar Spectro-Polarimetry

Minimally processed Stokes spectra are shown for the 709.0 nm region
Tuesday, August 8, 2017

Observational solar physics is entering a new era with the advent of new 1.5 m class telescopes with adaptive optics, as well as the Daniel K. Inouye 4 m telescope which will become operational in 2019. Major outstanding problems in solar physics all relate to the solar magnetic field.

Are All Flare Ribbons Simply Connected to the Corona?

Magnetic data are shown for active region 11890
Friday, July 21, 2017

We consider the observational basis for the belief that flare ribbons in the chromosphere result from energy transport from the overlying corona. We study ribbons of modest flares using magnetic as well as intensity data from the Hinode, SDO and IRIS missions.

On the Fine Structure Splitting of the 3p43d4D5/2 and 3p43d4D7/2 Levels of FE X

Raw S082B image with wavelength scale
Friday, July 21, 2017

We study UV spectra obtained with the SO82-B slit spectrograph on board SKYLAB to estimate the fine structure splitting of the Cl-like 3p43d4D5/2 and 3p43d4D7/2 levels of Fe X.

Editor in Chief of Open Astronomy, a flagship for open publishing

In late February 2017, Senior Scientist Philip Judge was contacted by Ewa Chmielewska, Managing Editor at De Gruyter Open, a scientific publisher of its own and third-party journals. To his great surprise, Ewa invited Philip to become Editor-In-Chief of the online journal Open Astronomy.

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