Memos

#000 2013/06/01 Imaging sensitivity estimates for HERA, Danny Jacobs

#001 2015/01/01 Confusion Limited Imaging on PSA64, Chris Carilli

#002 2015/03/01 HERA Blind Data Challenge Busy Week Summary The Ohio State University
February 23-25, 2015 , Jonathan Pober (auth), atten:Josh Dillon, Bryna Hazelton, Danny Jacobs, Lindley Lentati, Jonathan Pober, Peter Sims, Paul Sutter

#003 2015/04/01 The Effect of Primary Beam Sidelobes on Delay and Fringe Rate Transforms, J. Pober

#004 2015/04/01 Updated 21 cm Experiment Sensitivities (2015), J. Pober

#005 2015/08/01 Configuration of the HERA element (ie the dish design) Updated. D. DeBoer & A. Parsons

#006 2015/08/01 Crosstalk Measurements from PAPER-64, S.A. Kohn & J.E. Aguirre (August 2015)

#007 2015/09/01 The HERA RFI Environment, S.A. Kohn

#008 2015/10/1 The HERA Observing Season, J. Dillon and D. Jacobs (October 2015)

#009 2015/01/01
HERA_dish_reflectometry Nipanjana Patra, Zaki Ali, Carina Cheng, Dave DeBoer, Gilbert Hsyu, Tsz Kuk Leung, Aaron Parsons

#010 2015/11/01 System Temperatures of 21 cm Arrays, D. Jacobs, A. Beardsley, B. Hazelton, N. Thyagarajan, C. Trott

#011 2015/12/01 HERA Phase I Feed, D. DeBoer

#012 2016/05/05 HERA Imaging: Mock Observations using CASA, , C. Carilli, P. Sims

#013 2016/05/05 HERA Mock Observations: Looking for Closure  C. Carilli, P. Sims

#014 2016/06/17 HERA Mock Observations: Temporal Variations of Visibilities for a Transit Array, C. Carilli, P. Sims

#015 2016/08/09 H19 Commissioning: Closure Phases and Redundancy  Carilli

#016 2016/07/01 H19 Commissioning: System Temperature and a first Jy scale.   Adam Beardsley

#017 2016/6/17 HERA Calibration Sources   Jacobs   (June 2016)

#018 2016/10/30 Calibration of Quasi-Redundant Interferometers, John Sievers

#019 2016/9/1 RFI in HERA19,  Kohn

#020 2016/10/01 HERA S11 Feed Specification, Aaron Parsons

#021 2016/12/01 CST simulation of HERA and comparison with measurements, Nicolas Fagnoni, Eloy de Lera Acedo

#022 2016/12/20 Calibrating HERA-19 with a Galactic Centre Observation Bojan Nikolic, Chris Carilli, Peter Sims

#023 2017/03/01 HERA-19 Commissioning: Results from Sky Calibration, C.L. Carilli, B. Nikolic, K. Gale-Sides2

#024 2017/03/02 Omnical degeneracy removal, J. Dillon, A. Parsons

#025 2017/03/03 Minimum RF-Over-Fiber Cable Length, A. Parsons

#026 2017/03/31 HERA Noise Analysis, P. Mathieu and J. Pober

#027 2017/04/06 Power Spectrum Normalizations for HERA, A. Parsons

#028 2017/04/21 Imaging Capabilities of Outriggers in HERA-61, M. Kolopanis

#029 2017/05/25 Electromagnetic and electrical co-simulation of the HERA analogue system with CST – Delay spectrum response and sensitivity calculation, Nicolas Fagnoni, Eloy De Lera Acedo, Christos Kolitsidas

#030 2017/07/10 Redundant Calibration Degeneracies with Four Polarizations Josh Dillon, Adrian Liu, Saul Kohn, Nick Kern, and Aaron Parsons

#031 2017/07/12 The New HERA 75 Ohm Receiver system, Nima Razavi-Ghods, Steve Carey, John Ely, Tian Huang

#032 2017/7/1 More Results from Sky Calibration HERA,C.L. Carilli, B. Nikolic, K. Gale-Sides, G. Bernardi

#033 2017/07/12 RF installation of new HERA receiver systemSteven Carey, John Ely, Nima Razavi-Ghods

#034 2017/8/25 Modeling Sky Temperature, Parsons and Beardsley

#035 2017/9/01 A closer look at closure, Carilli & Nikolic

#036 2017/08/15, A figure of merit for constraining instrumental polarization systematics in the delay spectrum, Zak Martinot

#037 2017/09/20, Sky-based Calibration Procedures for FHD Using a Comprehensive Signal Path Framework, Nichole Barry

#038 2017/10/24, The “Hydrogen Epoch of Reionization Array” (HERA) – Improvement of the antenna response with a matching network and scientific impacts, Nic Fagnoni and Eloy De Lera Acedo

#039 2017/11/06, A Survey of HERA HC1 150 m cabe reflections, Aaron Ewall-Wice

#040 2017/11/20, Identifying Antenna Swaps with HERA Metrics, Kevin McNulty, Adam Beardsley

#041 2017/12/13, Sky-based Antenna Delays As A Starting Point For Redundant Calibration, Nicholas S. Kern, Chris Carilli, Saul Kohn, Josh Dillon, Aaron R. Parsons, Zaki S. Ali

#042 2018/01/19, Absolute Calibration Of HERA-47 IDR1, Nicholas Kern, Gianni Bernardi, Chris Carilli

#043 2018/02/06, Updated power spectrum normalization , Adrian Liu

#044 2018/04/24, hera_pspec Power Spectrum Normalization, Adrian Liu (updated 9 April 2020)

#045 v1,v2 2018/06/11, Internal Data Release 2.1, Josh Dillon and the HERA Analysis Team

#046 2018/06/14, How to set up an Astropy SkyCoord object to match the True Equinox and Equator Frame (Or how to make RA match LST), Bryna Hazelton

#047 2017/11/5, Some HERA System Definitions: I, David DeBoer, Eloy de Lera Acedo

#048 2018/08/01 Closure Diagnostics, James Kent, Chris Carilli, Bojan Nikolik, Nithyanandan Thyagarajan, Adam Beardsley

#049 2018/08/10 Mapping HERA’s Beam (with pt. sources), Tyler Cox (ASU)

#050 2018/08/22 Omnical Convergence (testing omnical rewrite), Aaron Parsons and Josh Dillon

#051b 2018/10/09 A Toy Model for Inverse Covariance Weighting, James Aguirre, Carina Cheng, PAPER Collaboration

#052 2018/10/09 A Toy Model for Signal Loss Adrian Liu, Carina Cheng, PAPER Collaboration

#053 2018/10/09 A Derivation and Application of the Jeffries Prior for Estimating Signal Loss in PAPER, Carina Cheng and the PAPER Collaboration

#054 2018/11/06 Bispectrum Phase around Fornax A Transit using IDR2.1 Data B. NIKOLIC, C. L. CARILLI, 1 J. KENT, K. GALE-SIDES, N. THYAGARAJAN, G. BERNARDI, AND S. MATIKA

#055 2018/11/06 Bispectrum Phase Delay Spectrum Analysis and Diagnostics J. KENT, B. NIKOLIC, C. L. CARILLI, 1 N. THYAGARAJAN, K. GALE-SIDES, SIYANDA MATIKA, AND GIANNI BERNARDI

#056 2018/11/06 Current status and understanding of bispectrum phase approach to detect Hi from Cosmic Reionization, Nithyanandan Thyagarajan, Chris Carilli, Bojan Nikolic, James Kent, Kingsley Gale-Sides, Siyanda Matika, Gianni Bernardi

#057 2018/07/01, Data Compression for HERA (and the data collection plan) Paul La Plante, James Aguirre, Bryna Hazelton, and Miguel Morales

#058 2018/07/16, Constant Offset in Cross-Polarized HERA IDR2.1 Data Katherine Elder,

#059 2018/11/16, Tsys for the HERA Broadband System, Nima Razavi-Ghods,

#060 2018/03/17, System noise from LST differencing. C. Carilli

#061 2019/01/11, Properly Normalized χ2 /DoF in Redundant-Baseline Calibration, J. Dillon

#062 2019/1/10, Wide band calibration, A. Parsons

#063 2019/1/28, A comparison of two absolute calibration models, R. Byrne,

#064 2019/2/7, Reflection systematics in HERA H1C data, N. Kern and A. Parsons,

#065  2019/3/13, Beam Pattern Measurements from HERA Observations, R. Nunhokee

#066 2019/4/4,  Determining H2C Tsys with a relative calibration to H1C, A Parsons

#067 2019/05/06,  A guide to the HERA Software Community, D. Jacobs and B. Hazelton

#068 2019/05/15, Revisiting receiver temperature (Trxr) measurements using auto-correlations, BK Ghelot, D. Jacobs, T. Cox, S Bechtel

#069 2019/08/01, H1C Internal Data Release 2.2, J. Dillon, HERA Analysis Team (updated 3 Dec 2019)

#070 2019/07/27, Node 9 Passband Diagnostics, Removal of Notch Feature, and Feed Cabling Instructions, A. Josiatis, E. de Lera Acedo, S. Dynes

#071 2019/08/21, On Data Rates: Saving Short Baselines, C. Carilli, B. Nikolic, N. Thyagarajan, P. LaPlante, J. Kent

#072 2019/09/25, Explaining and Mitigating the Temporal Structure of Calibration Solutions, M. Lee and J. Dillon

#073 2019/09/25, Sky Calibration and Fast Holographic Deconvolution, J. Kerrigan and J. Pober

#074 2019/10/30 HERA Dish Surface Inspection and Some Proposed Metrics, J. Burba, D Jacobs, T. Kunicki, D. Seitova

#075 2019/10/30 Vivaldi Feed Positioning: Tests, Implementation, and Results S. Dynes, A. Josaitis, E. de Lera Acedo, J. Hewitt, and H. Kim

#076 2020/01/01 HERA-12 Autocorrelations (Delay modes in first tests of 12 Vivaldi antennas), A. Ewall-Wice

#077 2020/03/18 H2C HERA-6 Autocorrelations (Delay modes in first tests of 6 Vivaldi antennas), A. Ewall-Wice

#078 2020/04/09 Absolute Calibration of H1C Data with RIMEz Simulations, J. Dillon, Z. Martinot NEW

#079 2020/04/09 Comparison between pyuvsim and HERA data, D. Seitova NEW

#080 2020/04/23 A brief guide to antenna inspection, B Pascua and A. Parsons

#081 2020/04/16 1D Beam Expansion Models for the HERA Primary Beam, S. Choudhuri, P. Bull, N. Kern

#082 2020/05/27 Useful Information About TV and Digital Audio RFI As Observed By HERA, M. Wilensky

#083 2020/06/01 Can HERA See the South Atlantic Anomaly?, M. Horn

#084 2020/11/19 A Generalized Approach to Redundant Calibration with JAX, M. Molnar, B. Nikolic

#085 20202/11/30 hera_sim for large, accurate, simulations, H. Garsden

#086 2021/1/21 HERA H1C IDR1 Power spectrum notes, N. Kern

#087 2020/5/12  Plan for a blind analysis of the simpleds shadow pipeline, D. Jacobs

#088 2021/1/22 A Test Of Optimal Mapping With Simulations Of A Point Source, J. Hewitt, Z. Xu, and H. Kim

#089 2021/10/28 SimpleDS Shadow Pipeline Test 0.1, M. Kolopanis

#090 2020/12/7 HERA H1C Shadow Pipeline Validation Test #1, M. Kolopanis, D. Jacobs

#091 2021/2/3 Some visualizations of cross-coupling beam models, D. Jacobs and B. Gehlot

#092 2020/8/25 Noise in delay spectrum after systematics subtraction, T. Dibblee-Barkman, A. Liu

#093 2020/8/22 Statistical Methods for Investigating Reflection Systematics D. Chen, A. Liu

#094 2021/2/5 Comparing Visibility Solutions from Relative Redundant Calibration by Degenerate Translation, M. Molnar, B. Nikolic

#095 2021/2/25 Motion of HERA Antenna Feeds, E. Rath, S. Dynes, J. Hewitt, M. Molewa

#096 2021/4/5 Time Correlations of EoR Signals for HERA with Vivaldi Feeds, N. Kern, S. Dynes, B. Nhan, H. Kim, J. Hewitt, E. Rath, N. Fagnoni, E. de Lera Acedo, D. Deboer

#097 2021/4/15 H1C Internal Data Release 3.2, J. Dillon

#098 2021/5/25 Mathematical Description of the vis_cpu simulator, P. Bull

#099 2021/5/25 Statistical distribution of a single coherently-averaged delay spectrum bandpower, P. Bull

#100 2021/7/21 Synchronizing the HERA correlator to an LST Grid, A. Parsons

#101 2021/7/23 Improvements on an analytical representation of the polarized HERA beam, T. Boyer

#102 2021/7/21 SNAP Clock Investigation, L. Berkhout

#103 2021/7/23 Excess Corr: The Berkeley Investigations L. Berkhout, M. Dexter, J. Kocz

#104 2021/10/5 A physical model for cross-talk in H1C, J. Dillon, A. Parsons, N. Kern

#105 2021/11/5 Investigation into the impact of feed height using measurements, models and sky data. Hewitt J, et al

#106 2021/10/17 Non-Gaussian Effects and Robust Location Estimates of Aggregated Calibrated Visibilities, M. Molnar, B. Nikolic

#107 2021/11/30 H1C IDR 3.2 Power Spectrum Analysis Updates and Choices J. S. Dillon

#108 2021/12/5 Using Deep Learning to Identify RFI in HERA Data, Z.L. Chen, P. La Plante

#109 2021/4/11 HERA RFI season 4 first look, D. Jacobs

#110 2022/1/31 Multivariate Outlier Detection Using Robust Mahalanobis Distances, M. Molnar and B. Nikolic

#111 2022/2/1 The Impact of Simulator Choice and Parameterization on Fringe-Rate Signal Loss Calculations, A. Ewall-Wice

#112 2022/4/29 The Detectability of FRBs with HERA, V Nagpal and J. Dillon

#113 2022/6/21 Normalization of Power Spectrum and Noise Power, S. Murray

#114 2022/9/25 Spherical Harmonic Decomposition of HERA’s Electromagnetic Primary Beam Simulations  C. De Los Santos, N. Kern, J. Hewitt

#115 2022/10/13 Investigation of Excess Correlation in SNAP Design L. Berkhout

#116 2022/10/13 Cross-feed Correlations as a Probe of Antenna Response Variation, Z. Martinot

#117 2022/10/21 Wavelets and Multiresolution Analysis in Radio Interferometry, M. Molnar and B. Nikolic

#118 2022/11/10 The Effect of Fallen Conduits on Autocorrelation Spectra, J. Hewitt, D. Riley, E. Rath, K. Chen

#119 2022/12/20 Constructing a Per-Antenna Primary Beam Perturbation Model with Autocorrelation Visibility Measurements, E. Rath, N. Kern, J. Hewitt, B. Nhan, H. Kim

#120 2022/12/19 Post-amplification Module (PAM) Attenuation and Status, Z. Xu

#121 2023/3/26 How often is lightning to blame for RFI in HERA data? W. Heligenstein, D. Jacobs

#122 2023/5/17 H6C (2023 season) Summary of Season Flags  J. S. Dillon and S. Murray

#123 2023/6/8 A statistical analysis of LST binning, S. Murray, J. S. Dillon

#124 2023/6/28  H6C Internal Data Release 2.1 S. Murray J.S. Dillon (data available to HERA collab members only) [Updated to V3, 18 Sept 2023]

#125 2023/10/16  H6C Internal Data Release 2.2 (data available to HERA collab members only)

#126 2023/09/29 Cubic & Fourier Interpolation Over Frequency for the HERA Vivaldi Beam, N. Carl, S. Murray

#127 2023/12/1  Definition of the Expected Power Spectrum In The H1C Validation Simulations, Z. Martinot and Z. Xu

#128 2024/2/27 Delay window functions for the HERA beams A. Gorce

#129 2025/3/27 A quick primer on the HERA DPSS fringe-rate filter implementation, P. Bull

#130 2024/7/31 Excess Variance of Visibilities and the Z-squared Statistic, S. Murray

#131 2024/9/4 Season 6 internal data release V2.3 (data available to HERA collab members only.) J.S. Dillon, S.G. Murray, T.A.Cox and Z.E. Martinot

#132 2024/9/20 Chi-squared with Gaussian Random Variables,  M. Wilensky

#133 2024/11/19 Improvements to Flagging of Low-Level RFI, J. S. Dillon