Memorials for SET Mentors

Space Environment Technologies acknowledges mentors who have contributed to the success of our community and our company. We are indebted to their assistance for advancing our evolution into space and their insightful challenges that will always be warmly remembered.

Bruce Bowman

Bruce R. Bowman (February 04, 1945-December 31, 2020) graduated from the University of California in Astronomy (1967) and later received a M.S. degree in Satellite Geodesy and Geophysics from the University of Hawaii in 1974. From 2000-2013 he was an Astrodynamicist for the U.S. Air Force Space Command and between 2013 and 2020 was a Senior Research Scientist in Space Environment Technologies.

Bruce specialized in the analysis of atmospheric drag on satellite orbits caused by solar heating and geomagnetic storms. He demonstrated through his Jacchia-Bowman-2008 (JB2008) thermosphere density model that the density variations, semiannual density changes, and satellite drag coefficient variations were based on important physical processes in the upper atmosphere and could be parameterized. His work included improvements in high accuracy special orbit determination, ballistic coefficient modeling, daily computation of global thermospheric temperature variations, analysis of on-orbit accelerometer data, and research in orbit decay in free and transitional molecular flow regimes.

He was awarded the 2008 Rotary National Award for Space Achievement for his significant contributions to space environment understanding, including improving space catalog accuracy, providing better collision avoidance with reduced spacecraft maneuvers, and significantly increasing accuracy of decay predictions.

Because of Bruce’s work, which led to the most significant thermosphere density improvement since the 1960’s, the COSPAR international organization adopted his JB2008 model as the COSPAR International Reference Atmosphere. The International Standards Organization adopted his JB2008 model as the standard for the Earth’s Upper Atmosphere (IS 14222).

The U.S. Air Force Space Command adopted his model as the operational basis for representing the atmosphere for the entire low Earth satellite catalog. Bruce was responsible for analyzing, monitoring, and maintaining the operational U.S. Air Force High Accuracy Satellite Density Model (HASDM) with its constellation of calibration satellites. HASDM is a data assimilative system used to obtain real-time global thermospheric density corrections to JB2008 for computing accurate satellite orbits for all spacecraft in low Earth orbit.

Bill Vaughan

William Walton Vaughan, Jr., (September 07, 1930–December 23, 2020) was a pioneer in the upper atmosphere community.

During his career, he served as Captain in the U.S. Air Force, Chief of the Atmospheric Science and Aerospace Environment Divisions with NASA, and was a charter member of the Federal Senior Executive Service.  His responsibilities included the establishment and interpretation of aerospace environment requirements for the design and operation of space vehicles and spacecraft including Jupiter vehicles, Apollo-Saturn vehicle, Space Shuttle, National Aerospace Plane and the International Space Station.  He worked with Wernher Von Braun and worked on projects for notable astronauts such as Neil Armstrong and Buzz Aldrin.

In activities with Space Environment Technologies, Bill worked tirelessly to develop the AIAA G-003 Guide to Reference and Standard Atmosphere Models and the ISO 11225 document of the same name. He led the effort in AIAA to have Bruce Bowman and W. Kent Tobiska become Associate Fellows.

Dr. Vaughan was the first Chairman of the American Institute of Aeronautics and Astronautics (AIAA) Standards Executive Council.  He achieved Fellow status with the American Meteorological Society (AMS) and AIAA.  He was a former member of the International Space Standards Organization and professional member of the American Geophysical Union, American Association for Advancement of Science, Standards Engineering Society and American Society of Mechanical Engineers.  He authored or co-authored more than 120 technical reports and journal articles.  He was also former Associate Editor of the Journal of Aerospace Technology and Management and is listed in Who’s Who in the World and America.

Bill Atwell

William Atwell (May 03, 1939-October 11, 2019) was a Senior Research Scientist of Space Environment Technologies. He was an internationally-recognized expert in the field of radiation physics that includes space radiation environments (geomagnetically-trapped Van Allen radiation, solar proton events, and galactic cosmic radiation), radiation effects on humans and onboard electronics/avionics systems, spacecraft and satellite 3-D CAD modeling and shielding analysis, development and use of high-energy particle transport/dose codes, active and passive detectors/dosimetry, and space radiation mission support (late Mercury, Gemini, Apollo, Skylab, ASTP, Space Shuttle, and the International Space Station programs). Bill’s career covered 42 years with The Boeing Company, Houston, TX, and he retired as a high-level Boeing Technical Fellow in June 2014 and immediately joined SET.

He was awarded the 2008 Rotary National Award for Space Achievement for his internationally recognized expertise and 40 years of experience in the areas of: the space radiation environment; high-energy particle transport through materials; active and passive dosimetry; spacecraft, satellite, and anatomical modeling/shielding analyses; radiation detection instrumentation; and biological and physical effects.

During his career he was a Co-Investigator on a number of NASA and ESA experiments. He mentored MS/PhD students at Colorado State University, University of Southern California, University of Maryland, and Texan A & M University, and he served on the University of Houston-Clear Lake Physics Advisory Board for several years. In addition, he had over 300 scientific and technical publications and presentations. He had an MS and BS from Indiana State University (Major: Physics/Math with an English minor) and did his PhD work in Nuclear Engineering at the University of Florida.

He participated actively and fully in our community’s effort to improve safety for crew and passengers in the aviation radiation arena. For example, his shielding studies for the ARMAS program, his contributions to the NASA SAFESKY LWS Institute, his attendance at the annual Space Weather Workshop in Boulder (including his infamous late night “heater” sessions with some new cigar), his push to fly dosimeters on commercial suborbital spacecraft, and his role in assimilating measurements with models through the NASA LWS RADIAN project are a short, recent list.

Charles Barth

Charles A. Barth (July 12, 1930-October 14, 2014) was director of the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado Boulder from 1965 to 1992 and professor until 2002 in CU-Boulder’s Department of Astrophysical and Planetary Sciences. He remained involved in research activities through 2013.

Barth was a pioneer in developing space-borne ultraviolet spectrometers, small spacecraft platforms, and planetary exploration systems. Under his guidance, science instruments were sent to every planet in the solar system. He was involved in many NASA missions, including 59 sounding rocket flights; Mariners 5, 6, 7, and 9; OGO 2, 4, 5, and 6; AE C and D; Apollo 17; Pioneer Venus; Galileo; and Cassini. As Principal Investigator, Barth led the Solar Mesospheric Explorer (SME) and Student Nitric Oxide Explorer (SNOE) missions that were operated from LASP.

Since the late 1950s, Barth studied planetary atmospheres, including Earth’s upper and middle atmosphere. He was among the first to recognize the importance of nitric oxide in Earth’s upper atmosphere, and its significance to ozone and water vapor. Of 140 published papers, 25 percent addressed nitric oxide, including his last published paper in 2010.

He was primary adviser for 22 Ph.D. students at CU-Boulder and inspired countless undergraduates in science and engineering with his commitment to hands-on education and training. Well-recognized for his research and teaching, his awards include the AGU Nicolet Lecture (1999), NASA Distinguished Public Service Medal (1983), University of Colorado Robert L. Stearns Award (1979), and NASA Exceptional Scientific Achievement (1972).

In the 1980’s Barth was the primary PhD dissertation advisor for SET’s founder, W. Kent Tobiska, and helped Tobiska develop a solid foundation in solar and atmospheric physics that carried into the formation of SET in 2001. Barth developed the concept for the Solar Mesosphere Explorer (SME), which was the first university built and run NASA satellite. Tobiska worked on the SME project during his initial graduate work in the early 1980’s.

Darrell Judge

Darrell L. Judge (November 02, 1934-August 26, 2014) was a professor emeritus of physics and astronomy and of astronautical engineering at the University of Southern California. He was an expert in the fields of spectroscopy, space science and solar physics, and was the founding director of the USC Space Sciences Center.

Following graduate school at USC Dornsife in the mid-1960s, Judge taught in the Department of Physics and Astronomy for 48 years. One of his greatest legacies is the USC Space Sciences Center (SSC), which he founded in 1978 to create new and multidisciplinary research opportunities for scientists and students. He was director of SSC from its inception in 1978 until his retirement in May 2013. Some of his most notable contributions include experiments flown on Pioneer 10 and 11 and the SOHO (Solar and Heliospheric Observatory) spacecraft (a collaboration between NASA and the ESA).

In the early 2000’s Judge worked closely with Space Environment Technologies to evolve the solar irradiance measurements from his SOHO SEM instrument into the current JB2008 S10 index that dramatically improved specification of the Earth’s upper atmosphere densities. Leonid Didkovsky became the successor Director of SSC following Judge’s retirement and Didkovsky continues to play a major role in designing and developing SET instrumentation, particularly for the ARMAS program. Seth Wieman, also part of SSC under Judge, continues to contribute importantly to SET’s ARMAS mechanical systems development. Kevin Judge, son of Darrell Judge, has long worked with SET to create the firmware capability for ARMAS.

Dick Donnelly

Richard F. Donnelly (March 26, 1937-August 19, 2009) was a mentor of Space Environment Technologies. He graduated from Washington High School and the South Dakota School of Mines and Technology and received M.S. and Ph.D. degrees in electrical engineering from the University of Illinois.

Dick did research in ionospheric and solar-terrestrial physics at the Boulder Labs for 30 years. He liked to say that they paid him for doing his hobby. In the 1980’s and 1990’s, Dick was instrumental in organizing the SOLar Electromagnetic Radiation Study for cycle 22 (SOLERS22) and published the “Proceedings of the Workshop on the Solar Electromagnetic Radiation Study for Solar Cycle 22” in July 1992 through NOAA ERL.

Dick played a key role in the history of Space Environment Technologies. Both Tobiska (SET President and Space Weather Division Chief Scientist) and Bouwer (Space Weather Division Chief Engineer) worked for Dick at NOAA ERL SEL in the 1980’s.

Under Dick’s guidance, they developed major indices now operationally used by the space weather community including the GOES 0.1-0.8 nm background index, the NOAA Mg II core-to-wing ratio index, and the SERF2 solar flux model, which was the precursor to SOLAR2000 and later SIP. These indices and solar irradiances were originally developed under Dick’s mentorship and now provide flare irradiances and indices for major operational space weather systems. Some of these are the JB2008 thermospheric density model that provides the most accurate specification of densities for satellite operations. CAPS and, soon, GAIM, incorporate information from these irradiances and indices that serve alerts and warnings to aviation and emergency responder HF communication users.

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