HESSI IMAGING

SIMULATIONS, RECONSTRUCTIONS AND DOCUMENTATION

Ed Schmahl

Univ. MD and GSFC

2006

Comparison of model and observed 2-src visibilities Dec 27, 2006
Notes on two-source Visibilities Dec 12, 2006
Visibility nugget (Schmahl & Hurford) Nov 6, 2006
MEM_NJIT Tutorial October, 2006
Footpoint_asymmetry nugget Aug 15, 2006
First Steps to Visibility Forward Fitting -- a tutorial Apr 10, 2006
(RHESSI Meudon Workshop) Hard X-ray Footpoint Fluxes and Areas Apr 6, 2006
Quick Initiation to MEM_NJIT Mar 31 2006
2002 Mar 14 Flare (paper accepted by ApJ) Mar 01, 2006
Radio-Based MEM for RHESSI: Pernak et al, SPD Poster (.pdf) (.ps) Apr. 2006
Size & Flux Asymmetry of Footpoint Sources (Schmahl et al, SPD Poster Feb 2006
Magnetic Asymmetries in Flares (Schmahl, Pernak & Hurford, COSPAR 2006) Feb 2006

2005

Hard X-ray Imaging Using A Radio-Based Method (.ps draft) Dec. 28, 2005
Hard X-ray Imaging Using A Radio-Based Method (.ps draft) Dec. 28, 2005
RHESSI Imaging Using MEM_NJIT Nov 17, 2005
IDL Visibility Routines Sept. 15, 2005
Hurford, Schmahl & Schwartz (.ppt) April, 2005
Stacks to Visibilities (.ppt)

2004

Notes on RHESSI Convolution in Fourier Space Jul 5, 2005
A Bayesian Justification for MEM Aug 30, 2004
Stacking a simulated pt src profile Jun 2004
Albedo Files Apr 2004
NESSI-II Albedo Talk (.ppt) Mar 2004
BPROJ2SIZE PACKAGE Mar 2004
Half Rotations Jan 2004

2003

COSPAR 2002: "Hard X-ray source profiles determined by RHESSI" .pdf .ps Sept 2003
SPD 2003: "Comparison of Methods for Determining Hard X-ray Source Sizes" .ppt June 2003
RHESSI-NESSI, Glasgow: Evidence for Albedo Emission in RHESSI flares" .ppt June 2003
"Observations of a `failed' eruption of a filament" .pdf, .ps May 2003
RHESSI-NoRH Flares March 3, 2003
Using Backprojection to get flare spatial scales February 19, 2003
Miscellaneous RHESSI flares (links and data) January 24, 2003

2002

Hard X-ray Source Profiles as Determined by RHESSI (accepted for publication, March 2003 Dec 19, 2002

RHESSI Imaging Concepts Solar Phys.2002

RHESSI-NoRH Flares Dec 3, 2002

Back-Projection Issues Nov 19, 2002

The X Flare of July 23, 2002 Sept 4, 2002

RHESSI Observations of the Size Scales for Hard X-ray Sources PDF , PS Aug 29, 2002

Alicia's M Flares Aug 23, 2002

Analytic methods for Extended Source Profiles PDF Jun 26, 2002

SPD 2000 Poster Paper Jun 10, 2002

Analysis of RHESSI Variance Jun 07, 2002

RHESSI source profiles May 16, 2002

Selected M-class Flares May 15, 2002

Overview of RHESSI Imaging April 11, 2002

RHESSI maps and profiles of M flares March 28, 2002

Comparisons of HESSI mapping Algorithms January 16, 2002

2001

Non-Negative Least Squares--A new HESSI imaging algorithm? December 19, 2001
Comments on Phase Diversity October 26, 2001
Keyword-Checking Pre-processor Program September 24, 2001
Over Resolution Evaluation August 16, 2001
Test-Data Reconstructions June 18, 2001
A new method for reconstructing visibilities from counts April 15, 2001
HESSI Imaging Practicalities February 5, 2001

2000

HESSI Imaging Concepts (Draft) December 18, 2000
Why regularize? October 13, 2000
Regularization October 16, 2000
A Forward Fitting Algorithm October 16, 2000
Principles of Unpixelized Forward Fitting October 6, 2000
SPD 2000 Poster August 8, 2000
Current and Expected Status of Image Reconstruction for HESSI June 29, 2000
Parameter Space Searches in Forward Fitting May 23, 2000
Plots of Gridlet Modulation, May 2000 May 18, 2000
Updated Program Diagram for Forward Fitting April 12, 2000
An Efficient Method for Computing Model Counts April 11, 2000
Comparison of the Cash Statistic and Chi-square for Fwd Fitting April 10, 2000
Analytic Gradient of Chi-square for Fwd Fitting March 31, 2000
Draft text and figures of "Hessi Imaging Capabilities", Hurford, Schmahl et al 2000 March 30, 2000
The details of converting counts to visibilities March 13, 2000 (.ps)
Equivalent Point Sources for Forward Fitting February 14, 2000
Polar Clean Strategy January 12, 2000

1999

Preprint of Aschwanden, Schmahl et al.: "Chi-square and C-statistic for Sparse Sampling" December 17, 1999
HESSI Point Spread Function (polar coordinates) December 2, 1999
Polar Mapping Programs (Release 4) November 24, 1999
Chi-square Statistics Improper for HESSI? November 22, 1999
Polar Mapping Programs October 25, 1999
Analytic Representation of the Point Spread Function October 2, 1999
Profile to Visibility Tests
Corrections for Back Projection
Steps toward Polar mapping July 26, 1999
New Visibility Programs July 21, 1999
Spin Axis
HESSI Variables and Equations .pdf (85 K) .ps (188 K)
Gordon's Seven Steps to Calibrated Images
Countrates to Visibilities to Polar Maps .pdf (8 MB) .ps (16 MB)
HESSI Symbols Diagram (.gif) (.pdf)
HESSI Algebraic Symbols (.ps) (.pdf) (.gif)
Converting Modulation profiles to Visibilities
What the heck are visibilities?
Use polar coordinates for HESSI visibilities!

1998

Edward J. Schmahl

Last modified: Mar 24 2000