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darrell-strobel

Darrell Strobel

Professor

121 Olin Hall
By appointment
410-516-7829
strobel@jhu.edu
Curriculum Vitae
Personal Website

Biography
Publications

In 1968, Darrell Strobel joined the Planetary Science Division at the Kitt Peak National Observatory in Tucson as a research associate, where he began theoretical studies of planetary atmospheres and continued his research in terrestrial aeronomy. He was promoted to assistant physicist in 1970, and in 1972 to associate physicist.  Strobel joined the Naval Research Laboratory's Plasma Physics Division in 1973 as a research physicist responsible for theoretical studies of the Earth's atmosphere. In 1976 he was promoted to the head of the Atmospheric Dynamics Section in the Geophysical and Plasma Dynamics Branch. In 1984, Strobel joined the Department of Earth and Planetary Sciences of The Johns Hopkins University as a professor, and also has a joint appointment as professor in the Department of Physics and Astronomy and is on the principal professional staff of Hopkins Applied Physics Laboratory. He is the author of more than 195 journal publications and 25 book chapters.

Strobel’s educational background is in physics and he specializes in planetary atmospheres/astrophysics. He studies a broad range of fundamental problems in atmospheric chemistry, dynamics, and radiation pertinent to the atmospheres of the giant planets and their satellites with the goal to understand the global structure of composition, pressure, temperature, and winds. Of particular current interest are magnetospheric plasma interactions with the extended atmospheres of Titan, Triton, Pluto, and the Galilean satellites (Io, Europa, and Ganymede) and investigation of the energy balance, ionospheric structure, and radiative output of their upper atmospheres, and the mass loading rates of the parent planets' magnetospheres. As a co-investigator of the UV Spectrometer Experiment on the Voyager Mission, he led in the identification of N2 as major constituent in the atmospheres of Titan and Triton and the interpretation of UV data in terms of energetics, charge exchange processes, and basic plasma properties of the Io plasma torus. He created, with colleagues Paul Feldman and Warren Moos of the Department of Physics and Astronomy, an active observational program with the Hubble Space Telescope (HST) of Jupiter, its Io plasma torus, and the Galilean satellites.

As the Cassini Mission Orbiter Interdisciplinary Scientist for Aeronomy and Solar Wind Interaction, he is currently involved in analysis and interpretation of data being taken on the orbital tour of the Saturnian system, which started in July 2004 and has been extended through 2017.  He is also a co-investigator on the New Horizons Pluto Kuiper-belt Mission, which was successfully launched on January 19, 2006, and will arrive at Pluto in July 2015. 

In addition to planetary interests, he has pursued research on topics concerning the Earth's atmosphere. His early studies of the Earth's F-region ionosphere led to the recognition of the important role that thermospheric wind systems play in plasma transport and seasonal variations of the electron density. More recently, his interests in terrestrial research have been on the dynamics of the middle atmosphere and the coupling and interaction of chemistry, radiation, and dynamics, including detailed studies of the zonally averaged circulation and minor constituent transport by waves and the mean circulation, which he still pursues with his colleague Xun Zhu of the JHU Applied Physics Laboratory.

Saturn’s variable thermosphere from Cassini/UVIS occultations

2015 , Icarus, 2015

Detection of Callisto’s oxygen atmosphere with the Hubble Space Telescope

2015 , Icarus 254, 178-189, 2015

Limits on Pluto's Atmospheric Escape Rate from Charge Exchange X-Rays

2015 , Lunar and Planetary Science Conference 46, 2991, 2015

The search for a subsurface ocean in Ganymede with Hubble Space Telescope observations of its auroral ovals

2015 , Journal of Geophysical Research: Space Physics 120 (3), 1715-1737, 2015

Pluto’s solar wind interaction: Collisional effects

2015 , Icarus 246, 303-309, 2015

Orbital apocenter is not a sufficient condition for HST/STIS detection of Europa’s water vapor aurora

2014 , Proceedings of the National Academy of Sciences 111 (48), E5123-E5132, 2014

Observations of Ganymede's variable auroral ovals on leading side derived from HST/STIS

2014 , AGU Fall Meeting Abstracts 1, 4308, 2014

Far-UV Eclipse Observations of Ganymede's Atmosphere with New Horizons Alice: New Constraints to the Atomic Oxygen Component

2014 , AGU Fall Meeting Abstracts 1, 4009, 2014

New HST observations of Io's time-variable UV aurora: Probing Io's magma ocean and neutral and plasma environment

2014 , AGU Fall Meeting Abstracts 1, 04, 2014

The New Horizons Radio Science Experiment: Expected Performance in Measurements of Pluto's Atmospheric Structure, Surface Pressure, and Surface Temperature

2014 , AGU Fall Meeting Abstracts 1, 06, 2014

A Model of Callisto's Ionosphere

2014 , AGU Fall Meeting Abstracts 1, 4306, 2014

Following up on the Discovery of Water Vapor at Europa's South Pole with HST

2014 , AGU Fall Meeting Abstracts 1, 05, 2014

Charge-Exchange X-rays: Limits on Pluto's Atmospheric Escape Rate

2014 , AAS/Division for Planetary Sciences Meeting Abstracts 46, 2014

Characterization of Callisto's O2 Atmosphere with HST

2014 , AAS/Division for Planetary Sciences Meeting Abstracts 46, 2014

HST/STIS observation of Ganymede's aurora: Investigating the variability of the auroral ovals

2014 , EGU General Assembly Conference Abstracts 16, 11616, 2014

Huygens highlights

2014 , EGU General Assembly Conference Abstracts 16, 15955, 2014

Titan Photochemistry 1974-2014

2014 , European Planetary Science Congress 2014, EPSC Abstracts, Vol. 9, id ..., 2014

Ion densities and magnetic signatures of dust pickup at Enceladus

2014 , Journal of Geophysical Research: Space Physics 119 (4), 2740-2774, 2014

Europa's UV Aurora: Following Up on the Discovery of the South Polar Water Vapor Plumes with HST/STIS

2014 , Lunar and Planetary Science Conference 45, 1488, 2014

Europa's Water Vapor Plumes: Discovery with HST and Plans for JUICE-UVS Observations

2014 , Lunar and Planetary Science Conference 45, 1639, 2014

Europa's Water Vapor Plumes: The Potential for Discovery with JUICE-UVS Observations

2014 , LPI Contributions 1774, 4033, 2014

Europa's Water Vapor Plumes: A Powerful Search Technique using HST UV Aurora Observations

2014 , LPI Contributions 1774, 4068, 2014

A phenomenological model of Io’s UV aurora based on HST/STIS observations

2014 , icarus 228, 386-406, 2014

The density and thermal structure of Pluto’s atmosphere and associated escape processes and rates

2014 , Icarus 228, 301-314, 2014

Transient water vapor at Europa’s south pole

2014 , Science 343 (6167), 171-174, 2014

Europa's Atmosphere and Aurora: Recent Advances from HST-STIS and Plans for Plume Searches with JUICE-UVS

2013 , AGU Fall Meeting Abstracts 1, 1838, 2013

HST Observations of Europa's UV Aurora Morphology

2013 , AGU Fall Meeting Abstracts 1, 01, 2013

Detection and Characterization of Callisto's Atmosphere with the Hubble Space Telescope

2013 , AGU Fall Meeting Abstracts 1, 03, 2013

HST/COS Detection of Atomic Oxygen Emissions from the Atmosphere of Callisto

2013 , AAS/Division for Planetary Sciences Meeting Abstracts 45, 2013

Hybrid model of Pluto's full atmosphere

2013 , AAS/Division for Planetary Sciences Meeting Abstracts 45, 2013

Auroral Processes at the Galilean Satellites

2013 , European Planetary Science Congress 2013, held 8-13 September in London, UK ..., 2013

Aurora on ganymede

2013 , Journal of Geophysical Research: Space Physics 118 (5), 2043-2054, 2013

On the thermal electron balance in Titan’s sunlit upper atmosphere

2013 , Icarus 223 (1), 234-251, 2013

Airglow on Titan During Eclipse

2012 , AGU Fall Meeting Abstracts 1, 1903, 2012

Ganymede's Magnetic Field Environment from Hubble Space Telescope Observations and Modelling

2012 , AGU Fall Meeting Abstracts 1, 08, 2012

Hubble Space Telescope Observations of Ganymede's Time-Variable Auroral Ovals

2012 , AGU Fall Meeting Abstracts 1, 2274, 2012

Influence of induction signals from the interior on the variation of Io's equatorial aurora spots

2012 , AGU Fall Meeting Abstracts 1, 02, 2012

Comparison of Hydrodynamic and Thermal Escape Rates of Pluto's Atmosphere

2012 , AGU Fall Meeting Abstracts 1, 1957, 2012

The CH4 structure in Titan's upper atmosphere revisited

2012 , Journal of Geophysical Research: Planets (1991–2012) 117 (E11), 2012

Hybrid Model Of Molecular Escape From Pluto's Highly Extended Atmosphere

2012 , AAS/Division for Planetary Sciences Meeting Abstracts 44, 2012

Planetary Aeronomy of the Outer Solar System

2012 , AAS/Division for Planetary Sciences Meeting Abstracts 44, 2012

The effective recombination coefficient in Titan's sunlit upper atmosphere

2012 , European Planetary Science Congress 2012 1, 307, 2012

Titan airglow during eclipse

2012 , Geophysical Research Letters 39 (18), 2012

Hydrogen and methane in Titan’s atmosphere: chemistry, diffusion, escape, and the Hunten limiting flux principle 1 1 This article is part of a Special Issue that honours the work of Dr. Donald M. Hunten FRSC who passed away in December 2010 after a very illustrious career.

2012 , Canadian Journal of Physics 90 (8), 795-805, 2012

Titan's Upper Atmosphere: The Great Escape?

2012 , Titan Through Time; Unlocking Titan's Past, Present and Future 1, 89, 2012

Variations of the UV emission from the atmosphere of the Jovian moon Io

2012 , EGU General Assembly Conference Abstracts 14, 2011, 2012

L18204 Titan airglow during eclipse (doi 10.1029/2012GL053230)

2012 , Geophysical Research Letters 39 (18), 2012

Temporal variations of UV emissions from Io's atmosphere

2011 , AGU Fall Meeting Abstracts 1, 08, 2011

HST/STIS Observations of Ganymede's Auroral Ovals at Eastern Elongation

2011 , AGU Fall Meeting Abstracts 1, 08, 2011

Energy deposition in Titan's upper atmosphere through charged particle precipitation from Saturn's magnetosphere

2011 , EPSC-DPS Joint Meeting 2011 1, 315, 2011

Hubble space telescope/advanced camera for surveys observations of Europa's atmospheric ultraviolet emission at eastern elongation

2011 , The Astrophysical Journal 738 (2), 153, 2011

Simulation of Io’s auroral emission: Constraints on the atmosphere in eclipse

2011 , Icarus 214 (2), 495-509, 2011

An investigation of Pluto’s troposphere using stellar occultation light curves and an atmospheric radiative–conductive–convective model

2011 , Icarus 214 (2), 685-700, 2011

HST/ACS Observations of Europa's Atmospheric UV Emission at Eastern Elongation

2011 , arXiv preprint arXiv:1106.1409, 2011

Observations and Modeling of H2 Fluorescence with Partial Frequency Redistribution in Giant Planet Atmospheres

2011 , The Astrophysical Journal 732 (1), 37, 2011

An analysis of Pluto occultation light curves using an atmospheric radiative–conductive model

2011 , Icarus 211 (1), 804-818, 2011

Investigating Pluto's Troposphere Using a Radiative-conductive-convective Model and Stellar Occultation Data

2010 , Bulletin of the American Astronomical Society 42, 983, 2010

HST UV Observations Of The Extended Atmosphere Of Titan

2010 , Bulletin of the American Astronomical Society 42, 1068, 2010

Molecular hydrogen in Titan’s atmosphere: Implications of the measured tropospheric and thermospheric mole fractions

2010 , Icarus 208 (2), 878-886, 2010

Energetic neutral atoms from Titan: Particle simulations in draped magnetic and electric fields

2010 , Journal of Geophysical Research: Space Physics (1978–2012) 115 (A6), 2010

Simulation of Io's auroral emission in Eclipse

2010 , EGU General Assembly Conference Abstracts 12, 5061, 2010

New Horizons LORRI Observations of Io's Plume Atmospheres in Eclipse

2010 , EGU General Assembly Conference Abstracts 12, 11457, 2010

Enceladus' variable magnetospheric interaction: a hybrid simulation study

2010 , EGU General Assembly Conference Abstracts 12, 2860, 2010

The New Horizons Mission to Pluto and the Kuiper Belt

2010 , 38th COSPAR Scientific Assembly 38, 634, 2010

Atmospheric structure and composition

2010 , Titan from Cassini-Huygens, 235-257, 2010

Titan ionospheric conductivities from Cassini measurements

2009 , Planetary and Space Science 57 (14), 1828-1833, 2009

Titan’s Greenhouse Effect and Climate: Lessons from the Earth’s Cooler Cousin

2009 , AAS/Division for Planetary Sciences Meeting Abstracts# 41 41, 2009

Modelling Io's auroral emission and the interaction of the moon's atmosphere-ionosphere with the Jovian magnetosphere

2009 , AGU Fall Meeting Abstracts 1, 1605, 2009

HST observations of Europa's atmospheric UV emission

2009 , AGU Fall Meeting Abstracts 1, 1177, 2009

Slow Hydrodynamic Escape from Planetary Atmospheres

2009 , European Planetary Science Congress 2009 1, 169, 2009

Satellite Atmospheres: Interaction with their parent planets' magnetospheres

2009 , European Planetary Science Congress 2009 1, 647, 2009

Titan's hydrodynamically escaping atmosphere: Escape rates and the structure of the exobase region

2009 , Icarus 202 (2), 632-641, 2009

Results from the Huygens probe on Titan

2009 , The Astronomy and Astrophysics Review 17 (2), 149-179, 2009

Titan's Hydrodynamically Escaping Atmosphere and the Structure of the Exobase Region

2009 , EGU General Assembly Conference Abstracts 11, 6265, 2009

TandEM: Titan and Enceladus mission

2009 , Experimental Astronomy 23 (3), 893-946, 2009

The New Horizons radio science experiment (REX)

2009 , New Horizons, 217-259, 2009

Titan's Hydrodynamically Escaping Atmosphere and the Structure of the Exobase Region

2008 , AGU Fall Meeting Abstracts 1, 05, 2008

FUSE Observations of Jovian Aurora at the Time of the New Horizons Flyby

2008 , AGU Fall Meeting Abstracts 1, 1664, 2008

A debris disk surrounding Saturn's moon Rhea

2008 , AGU Fall Meeting Abstracts 1, 04, 2008

Surfaces and atmospheres of the outer planets, their satellites and ring systems: Part IV

2008 , Planetary and Space Science 56 (12), 1571-1572, 2008

Exchange of global mean angular momentum between an atmosphere and its underlying planet

2008 , Planetary and Space Science 56 (11), 1524-1531, 2008

New Horizons: Anticipated scientific investigations at the Pluto system

2008 , Space Science Reviews 140 (1-4), 93-127, 2008

Evidence for temporal variability of Enceladus' gas jets: Modeling of Cassini observations

2008 , Geophysical Research Letters 35 (20), 2008

Neutral atmospheres

2008 , Space science reviews 139 (1-4), 191-234, 2008

Exospheres and atmospheric escape

2008 , Space Science Reviews 139 (1-4), 355-397, 2008

The Demise of Print

2008 , Eos, Transactions American Geophysical Union 89 (28), 257-257, 2008

An equatorial oscillation in Saturn’s middle atmosphere

2008 , Nature 453 (7192), 200-202, 2008

The dust halo of Saturn's largest icy moon, Rhea

2008 , Science 319 (5868), 1380-1384, 2008

N 2 escape rates from Pluto's atmosphere

2008 , Icarus 193 (2), 612-619, 2008

Titan's hydrodynamically escaping atmosphere

2008 , Icarus 193 (2), 588-594, 2008

Photoemission phenomena in the solar system

2008 , Comparative Aeronomy, 267-310, 2008

Plasma flow and related phenomena in planetary aeronomy

2008 , Comparative Aeronomy, 311-353, 2008

Icy Galilean Satellite UV Observations by New Horizons and HST

2007 , AGU Fall Meeting Abstracts 1, 06, 2007

Properties of Enceladus' gas plumes from simulations of the their plasma interaction with Saturn's magnetosphere

2007 , AGU Fall Meeting Abstracts 1, 01, 2007

Rhea's interaction with Saturn's magnetosphere

2007 , AGU Fall Meeting Abstracts 1, 05, 2007

Mapping the temperature and composition of Saturn's stratosphere from Cassini/CIRS observations

2007 , AGU Fall Meeting Abstracts 1, 0185, 2007

Io's atmospheric response to eclipse: UV aurorae observations

2007 , science 318 (5848), 237-240, 2007

Io Eclipse Observations During the New Horizons Jupiter Flyby

2007 , Bulletin of the American Astronomical Society 39, 437, 2007

Temporal behavior of the SO 1.707 μm ro-vibronic emission band in Io's atmosphere

2007 , Icarus 189 (2), 401-408, 2007

Meridional variations of C 2 H 2 and C 2 H 6 in Jupiter's atmosphere from Cassini CIRS infrared spectra

2007 , Icarus 188 (1), 47-71, 2007

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