An interferometric analysis method for radio impulses from ultra-high energy particle showers

Romero-Wolf, A.; Hoover, S.; Vieregg, A. G.; Gorham, P. W.; Allison, P.; Barwick, S. W.; Baughman, B. M.; Beatty, J. J.; Belov, K.; Besson, D.; Bevan, S.; Binns, W. R.; Chen, C.; Chen, P.; Clem, J.; Connolly, A.; Detrixhe, M.; Marco, Daniel De; Dowkontt, P. F.; DuVernois, M. A.; Goldstein, David J.; Grashorn, E.; Hill, B.; Huang, M. A.; Israel, M. H.; Javaid, A.; Kowalski, J.; Learned, J. G.; Liewer, K. M.; Matsuno, S.; Mercurio, B. C.; Miki, C.; Mottram, M.; Nam, J. W.; Naudet, C. J.; Nichol, R. J.; Palladino, K. J.; Ruckman, L.; Saltzberg, D.; Seckel, D.; Shang, Ruo Yu; Stockham, J.; Stockham, M.; Varner, G.; Wang, Y.

doi:10.1016/j.astropartphys.2014.06.006

Cited by 42 publications

(41 citation statements)

References 36 publications

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“…For each event, the polar and azimuthal angles of a putative source are then assigned to that particular ( θ , φ ) grid pixel, out of the 180 × 360 tested, which gives the highest total cross‐correlation

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. More extensive details on the construction of the ANITA interferometric map can be found in the literature [ Romero‐Wolf et al , ].…”

Section: Interferometry Applied To Solar Imagingmentioning

confidence: 99%

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Antarctic radio frequency albedo and implications for cosmic ray reconstruction

et al. 2015

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We describe herein a measurement of the Antarctic surface “roughness” performed by the balloon‐borne ANITA (Antarctic Impulsive Transient Antenna) experiment. Originally purposed for cosmic ray astrophysics, the radio frequency (RF) receiver ANITA gondola, from its 38 km altitude vantage point, can scan a disk of snow surface 600 km in radius. The primary purpose of ANITA is to detect RF emissions from cosmic rays incident on Antarctica, such as neutrinos which penetrate through the atmosphere and interact within the ice, resulting in signal directed upward which then refracts at the ice‐air interface and up and out to ANITA, or high‐energy nuclei (most likely irons or protons), which interact in the upper atmosphere (at altitudes below ANITA) and produce a spray of down‐coming RF which reflects off the snow surface and back up to the gondola. The energy of such high‐energy nuclei can be inferred from the observed reflected signal only if the surface reflectivity is known. We describe herein an attempt to quantify the Antarctic surface reflectivity, using the Sun as a constant, unpolarized RF source. We find that the reflectivity of the surface generally follows the expectations from the Fresnel equations, lending support to the use of those equations to give an overall correction factor to calculate cosmic ray energies for all locations in Antarctica. The analysis described below is based on ANITA‐II data. After launching from McMurdo Station in December 2008, ANITA‐II was aloft for a period of 31 days with a typical instantaneous duty cycle exceeding 95%.

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. More extensive details on the construction of the ANITA interferometric map can be found in the literature [ Romero‐Wolf et al , ].…”

Section: Interferometry Applied To Solar Imagingmentioning

confidence: 99%

“…More extensive details on the construction of the ANITA interferometric map can be found in the literature [Romero-Wolf et al, 2015].…”

Section: Radio Sciencementioning

confidence: 99%

Antarctic radio frequency albedo and implications for cosmic ray reconstruction

et al. 2015

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“…The geodetic positions in each case are given according to the estimated location of X max . Figure 1 shows the field-strength waveforms for all of the events, derived from coherent beam forming [9], with the instrumental response then deconvolved. Both Hpol and Vpol are plotted.…”

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confidence: 99%

“…Table I shows characteristics of the three stratospheric events. Angles of arrival relative to the payload horizontal and their standard errors are determined through pulsephase interferometric mapping [9]. Distances to various integrated atmospheric column depths X, including the approximate depth of shower maximum X max , assuming a shower energy of ∼10 18 eV, are given along the track, based on a standard atmosphere model for Antarctica, and with uncertainties primarily dominated by the angle-ofarrival uncertainty.…”

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confidence: 99%

Characteristics of Four Upward-Pointing Cosmic-Ray-like Events Observed with ANITA

Gorham¹,

Nam²,

Romero-Wolf³

et al. 2016

Phys. Rev. Lett.

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We report on four radio-detected cosmic-ray (CR) or CR-like events observed with the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload. Two of the four were previously identified as stratospheric CR air showers during the ANITA-I flight. A third stratospheric CR was detected during the ANITA-II flight. Here, we report on characteristics of these three unusual CR events, which develop nearly horizontally, 20-30 km above the surface of Earth. In addition, we report on a fourth steeply upward-pointing ANITA-I CR-like radio event which has characteristics consistent with a primary that emerged from the surface of the ice. This suggests a possible τ-lepton decay as the origin of this event, but such an interpretation would require significant suppression of the standard model τ-neutrino cross section.

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“…Figure 4 shows pointing resolution determined by using the Western Antarctic Ice Seet (WAIS) Divide pulser data. Here, the directions of the received radio pulses were obtained by the interferometry technique which is the kernel of ANITA data analysis [18], and the results show excellent pointing capability of ANITA-4; angular resolutions for vertical and horizontal-directions are σ θ = 0.15 • and σ φ = 0.5 • , respectively. Figure 5 shows a couple of preliminary candidate events detected by ANITA-4; one predom-…”

Section: Pos(icrc2017)952mentioning

confidence: 99%

Overview of the Fourth Flight of the ANITA Experiment

Nam¹

2017

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)

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The ANITA (ANtarctic Impulsive Transient Antenna) is a NASA long-duration balloon payload with an array of radio antennas. The primary goal of ANITA is to search for ultra-high energy cosmogenic neutrinos by detecting their impulsive radio signals emitted via the Askaryan effect in the Antarctic ice sheet. Moreover, ANITA is able to detect radio impulses produced from ultrahigh energy cosmic-ray showers as result of their emissions via interaction with the geomagnetic field. The ANITA-IV experiment was launched on December 2, 2016, and successfully completed 28 days of flight. We will present the ANITA-IV instrument, flight operation, calibration as well as the status of the data analysis.

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An interferometric analysis method for radio impulses from ultra-high energy particle showers

Cited by 42 publications

References 36 publications

Antarctic radio frequency albedo and implications for cosmic ray reconstruction

Antarctic radio frequency albedo and implications for cosmic ray reconstruction

Characteristics of Four Upward-Pointing Cosmic-Ray-like Events Observed with ANITA

Overview of the Fourth Flight of the ANITA Experiment

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