Some photos from my recent Antarctic expedition to launch and support ANITA-4..

ANITA-4 before launch

Ready for launch!

Launched and flying high!
                 P.C. Steven P.










The Antarctic Impulsive Transient Antenna (ANITA) is a NASA long-duration balloon mission for the Askaryan radio detection of ultra-high-energy (UHE) neutrinos. I am a PhD student member of this collaboration, and deployed our recent ANITA-4 mission in McMurdo, Antarctica.


Cartoon showing Askaryan radio detection of theorized ultra-high-energy neutrinos

Why neutrinos?

Neutrinos are some of the most elusive particles in Nature, but they are the only ones that can travel large cosmic distances, at the highest energies. We want to study high-energy Astronomy and Astrophysics using neutrinos as messengers (instead of photons)!

My hardware


This is a single channel of the TUFF board. I built this hardware for second-stage amplification and dynamic filtering. Turns out my hardware was really critical for the success of the ANITA-4 mission ?

Why Antarctica?

  1. Has lots of ice (dielectric target medium) for neutrinos to interact in and produce optical Cherenkov (IceCube) and radio Cherenkov (ANITA, ARA, ARIANNA) light.
  2. It is radio-quiet compared to rest of the world so less noisy for radio experiments.
  3. Earth’s magnetic field points straight down giving cosmic-ray signals a distinctive polarization.
  4. Summer polar vortex allows balloon-borne ANITA to fly in circles over the continent observing ~ 1 million cubic km of Antarctic ice for UHE neutrinos.


First results from the third flight of the ANITA experiment using a new binned analysis I am writing this right now with plans to submit to Astroparticle Journal.

Dynamic tunable notch filters for the Antarctic Impulsive Transient Antenna (ANITA), P. Allison et al., Submitted to Nuclear Instruments and Methods A. I wrote this paper as corresponding author on behalf of the ANITA collaboration.

Characteristics of Four Upward-pointing Cosmic-ray-like Events Observed with ANITA, P. W. Gorham et al., Phys.Rev.Lett. 117 (2016) no.7, 071101. I wrote a preliminary Monte Carlo simulation for energy loss of the tau lepton in different media.

Antarctic Surface Reflectivity Measurements from the ANITA-3 and HiCal-1 Experiments, P. W. Gorham et al., J. Astron. Instrum. 06, 1740002 (2017).