Dr Alexa J Halford PhD

• PhD, University of Newcastle, Australia in Physics, 2012
• MSci, University of Colorado Boulder, USA in Astrophysics and Planetary Sciences, 2007
• BA Augsburg University, MN, USA Double major Math and Physics with Honors and from the McNair Scholars program, 2003

Dr Alexa J Halford is an Associate Professor in Space Environment at University of Birmingham. A space physicist with a career spanning universities, NASA and the aerospace sector, she combines scientific research with mission leadership, mentoring and public engagement.

Before joining Birmingham, Alexa served as Branch Head of NASA Goddard’s Ionosphere, Thermosphere and Mesosphere Laboratory. In this role, she helped shape research strategy, supported staff development and built collaborations across scientific disciplines. As Goddard’s heliophysics and space weather strategy lead for Artemis, she worked across scientific divisions, centers and agencies to connect space science with the needs of human exploration.

Alexa has held leadership roles across several space missions. As principal investigator for the LAMP sounding rocket mission, she led an international team through integration, testing, field operations and a successful launch to investigate pulsating aurora. She also served as deputy principal investigator for petitSat and Deputy Project Scientist for the Magnetospheric Auroral Asymmetry eXplorer (MAAX) Phase A mission concept study. Her earlier work included coordinating observations and international collaborations for the BARREL scientific balloon mission.

Her service to the wider scientific community includes NASA’s Living With a Star TR&T steering committee, the Space Weather Operations, Research, and Mitigation working group’s committee, and NASA’s Space Weather Council. She has also served as Heliophysics Liaison to the Lunar Exploration and Analysis Group.

Mentoring and inclusion are central to Alexa’s approach to leadership. She supports students and early career researchers, creates opportunities for collaboration, and advocates for research environments that reduce burnout and help people thrive.

Alexa also brings space science to audiences beyond academia through public talks, writing, broadcast interviews and creative collaborations. Her engagement includes contributions to The Conversation, interviews for NASA’s Curious Universe podcast, and an SXSW collaboration on the “Sounds of Space” silent disco. Across these activities, she invites people to explore the connections between space, our planet and everyday life.

She holds a PhD in Physics from the University of Newcastle, Australia, a master’s degree in Astrophysics and Planetary Sciences from the University of Colorado Boulder, and a bachelor’s degree with Honours in Mathematics and Physics from Augsburg College.

Space weather phenomena, dynamics, and impacts as well as space weather awareness tool development.

Dr Halford investigates how dynamics in Earth’s near-space environment shape space weather and its impacts on our technology and lives. Her research treats the magnetosphere, ionosphere and atmosphere as an interconnected system, bringing together observations and expertise across fields to understand processes that cross their boundaries.

A central focus is the interaction between electromagnetic waves and charged particles in Earth’s radiation belts. These interactions can change particle motion and scatter otherwise trapped particles into the atmosphere where they can cause problems for satellites and communication systems, but also produce the beautiful auroral lights. She examines how waves are generated, grow and propagate, which conditions make them effective at driving particle loss, and how different mechanisms act together during both geomagnetic storms and quieter periods. Her expertise includes electromagnetic ion cyclotron waves, whistler-mode chorus and hiss, and ultra-low-frequency waves.

To investigate these processes, Dr Halford combines measurements from satellites, stratospheric balloons, sounding rockets and ground-based instruments with modelling and theory. Coordinated observations allow her to connect processes measured in space with their atmospheric signatures, helping establish where interactions occur, how widely they extend and how they evolve. Her work draws on datasets from missions and facilities including the Van Allen Probes, BARREL, REACH and EISCAT.

Her research connects this fundamental physics with practical questions about the space environment. She studies energetic particle precipitation and its atmospheric consequences, with interests extending to radiation exposure at aviation altitudes and upper-atmosphere changes that can affect satellite drag. Understanding these connections supports better interpretation of space weather hazards and the development of useful space-environment models.

Statistical analysis and machine learning are important components of this work. Dr Halford uses large, varied datasets to identify relationships, test physical interpretations and assess predictive capabilities. Her projects include machine learning studies of atmospheric neutral density and the development of tools for rapidly prototyping, validating and inspecting artificial intelligence and machine learning models for heliophysics.

Another strand of her research examines how scientific advances become usable applications. She led an international team in developing the Application Usability Level framework, which helps teams assess progress against the needs of intended users. Her experience developing space weather data products and hazard analysis tools informs this work, linking scientific understanding with validation and practical use.

Across these activities, she aims to explain how local plasma processes produce wider changes in the space environment and atmosphere, and to turn that understanding into knowledge and tools that benefit society.