Presentation is loading. Please wait.

Presentation is loading. Please wait.

3/2/2005MUG Meeting, Tucson1 Status of GONG+ Magnetograms How GONG makes magnetograms Performance Problems Solutions Schedule Data availability Pilot Projects.

Published byEdmund Hunt Modified over 9 years ago

Similar presentations

Presentation on theme: "3/2/2005MUG Meeting, Tucson1 Status of GONG+ Magnetograms How GONG makes magnetograms Performance Problems Solutions Schedule Data availability Pilot Projects."— Presentation transcript:

1 3/2/2005MUG Meeting, Tucson1 Status of GONG+ Magnetograms How GONG makes magnetograms Performance Problems Solutions Schedule Data availability Pilot Projects

2 3/2/2005MUG Meeting, Tucson2 How GONG Makes Magnetograms Photospheric 6768 Å Ni I line profile LCD & polarizer transmits LCP or RCP Switches state every second Images sorted & accumulated for 1 minute Line shift images produced in LCP and RCP Sum is the Doppler shift image Difference is longitudinal Zeeman splitting + Also get intensity and line strength images

3 3/2/2005MUG Meeting, Tucson3 Magnetogram Performance Inst noise level ~3 G per pixel per min Spatial resolution >5 arc second Dynamic range <  2300 G Scale tied to velocity cal error (~5%) Quick look available 2 min after obs Revealed  B ~ 100G with 15/15 X flares

4 3/2/2005MUG Meeting, Tucson4 Magnetogram Example November 25, 2000

5 3/2/2005MUG Meeting, Tucson5 Problems Slow modulation -> seeing and cloud noise Bad near limb and sunspots (  I < 0.5%) Asymmetric modulation -> zero error (<10 G) Slight, time-varying input polarization Time to switch CP states not the same LCD near focus so its variations show Image rotates during the day

6 3/2/2005MUG Meeting, Tucson6 Solutions Seeing Stretch CP images to spatially match Average over longer time Zero error Eliminate instrumental polarization  Better LCDs  Equalize switching time of LCD Adjust images after collection 

7 3/2/2005MUG Meeting, Tucson7 Schedule Replace old modulators/drivers (approved project) Prototype testing successfully done Final design underway Network installation done by 2/2006 Tweak older images (not an approved project yet) Extensive earlier effort led to improvement Now starting a review of this work Other data products - TBD

8 3/2/2005MUG Meeting, Tucson8 Data Availability Quick look magnetograms 1/hour (ftp) Quick look magnetograms 1/day (html) Final magnetograms 1/min (DMAC) Merged magnetogram time series (TBD) Synoptic maps – GONG classic (html and ftp) Other products (TBD)

9 3/2/2005MUG Meeting, Tucson9 Two Pilot Data Projects GONG Magnetic Activity Indices Full disk averages w/thresholds Meridional flow by LCT of magnetic network Based on KPVT work of Komm et al. Need to determine how much averaging is required to beat down supergranulation noise Both projects just starting May lead to standard data products

Download ppt "3/2/2005MUG Meeting, Tucson1 Status of GONG+ Magnetograms How GONG makes magnetograms Performance Problems Solutions Schedule Data availability Pilot Projects."

Similar presentations

T. Berger Solar-B FPP Solar & Astrophysics Laboratory FPP Overview NRL Meeting 18-Nov-99 1. FPP Science Goals 2. Level 0 Requirements 3. FPP Instrument.

T. Berger Solar-B FPP Solar & Astrophysics Laboratory FPP Overview NRL Meeting 18-Nov FPP Science Goals 2. Level 0 Requirements 3. FPP Instrument.
1 GONG Magnetogram pipeline. 2 The GONG Data Processing Pipeline

1 GONG Magnetogram pipeline. 2 The GONG Data Processing Pipeline
HMI Data Analysis Software Plan for Phase-D. JSOC - HMI Pipeline HMI Data Analysis Pipeline Doppler Velocity Heliographic Doppler velocity maps Tracked.

HMI Data Analysis Software Plan for Phase-D. JSOC - HMI Pipeline HMI Data Analysis Pipeline Doppler Velocity Heliographic Doppler velocity maps Tracked.
Back Reaction on the Photospheric Magnetic field in Solar Eruptions Dandan Ye.

Back Reaction on the Photospheric Magnetic field in Solar Eruptions Dandan Ye.
Komm 1 GONG & STEREO What is this helioseismologist doing here?? – “We all study phenomena that are driven or strongly influenced.

Komm 1 GONG & STEREO What is this helioseismologist doing here?? – “We all study phenomena that are driven or strongly influenced.
Physics 681: Solar Physics and Instrumentation – Lecture 20 Carsten Denker NJIT Physics Department Center for Solar–Terrestrial Research.

Physics 681: Solar Physics and Instrumentation – Lecture 20 Carsten Denker NJIT Physics Department Center for Solar–Terrestrial Research.
AGU – Fall 2006 The Solar Polar Field – Cycles 21 – 23 The Solar Polar Field During Solar Cycles 21-23 J. Todd Hoeksema, Yang Liu, XuePu Zhao & Elena Benevolenskaya.

AGU – Fall 2006 The Solar Polar Field – Cycles 21 – 23 The Solar Polar Field During Solar Cycles J. Todd Hoeksema, Yang Liu, XuePu Zhao & Elena Benevolenskaya.
HMI & Photospheric Flows 1.Review of methods to determine surface plasma flow; 2.Comparisons between methods; 3.Data requirements; 4.Necessary computational.

HMI & Photospheric Flows 1.Review of methods to determine surface plasma flow; 2.Comparisons between methods; 3.Data requirements; 4.Necessary computational.
Remarkable Low Temperature Emission of the 4 November 2003 Limb Flare J. Leibacher, J. Harvey, GONG Team (NSO), G. Kopp (CU/LASP), H. Hudson (UCB/SSL)

Remarkable Low Temperature Emission of the 4 November 2003 Limb Flare J. Leibacher, J. Harvey, GONG Team (NSO), G. Kopp (CU/LASP), H. Hudson (UCB/SSL)
A particularly obvious example of daily changing background noise level Constructing the BEST High-Resolution Synoptic Maps from MDI J.T. Hoeksema, Y.

A particularly obvious example of daily changing background noise level Constructing the BEST High-Resolution Synoptic Maps from MDI J.T. Hoeksema, Y.
Magnetic Fields at Mt. Wilson and MDI. The 150-foot Tower Spectrograph Measures 12 line pairs simultaneously The long-term program uses 5250. The full.

Magnetic Fields at Mt. Wilson and MDI. The 150-foot Tower Spectrograph Measures 12 line pairs simultaneously The long-term program uses The full.
HMI – Synoptic Data Sets HMI Team Meeting Jan. 26, 2005 Stanford, CA.

HMI – Synoptic Data Sets HMI Team Meeting Jan. 26, 2005 Stanford, CA.
September 2006 CISM All Hand Meeting Progress in the Past Year and Plan for Next Year Yang Liu and the Solar Group in Stanford University

September 2006 CISM All Hand Meeting Progress in the Past Year and Plan for Next Year Yang Liu and the Solar Group in Stanford University
2008/10/21 J. Fontenla, M Haberreiter LASP – Univ. of Colorado NADIR MURI Focus Area.

2008/10/21 J. Fontenla, M Haberreiter LASP – Univ. of Colorado NADIR MURI Focus Area.
1Yang LiuCISM All-hand meeting CISM All-hand Meeting Yang Liu – Stanford University

1Yang LiuCISM All-hand meeting CISM All-hand Meeting Yang Liu – Stanford University
R. Komm & Friends NSO, Tucson R. Komm & Friends NSO, Tucson Solar Subsurface Flows from Ring-Diagram Analysis.

R. Komm & Friends NSO, Tucson R. Komm & Friends NSO, Tucson Solar Subsurface Flows from Ring-Diagram Analysis.
Accurate Polar and small scale observations during the solar cycle Elena E. Benevolenskaya Yang Liu J. Todd Hoeksema Stanford University HMI/AIA meeting,

Accurate Polar and small scale observations during the solar cycle Elena E. Benevolenskaya Yang Liu J. Todd Hoeksema Stanford University HMI/AIA meeting,
Study of magnetic helicity in solar active regions: For a better understanding of solar flares Sung-Hong Park Center for Solar-Terrestrial Research New.

Study of magnetic helicity in solar active regions: For a better understanding of solar flares Sung-Hong Park Center for Solar-Terrestrial Research New.
HMI Magnetic Products & Pipeline

HMI Magnetic Products & Pipeline
Advanced Technology Center 1 HMI Rasmus Larsen / Processing Modules Stanford University HMI Team Meeting – May 2003 Processing Module Development Rasmus.

Advanced Technology Center 1 HMI Rasmus Larsen / Processing Modules Stanford University HMI Team Meeting – May 2003 Processing Module Development Rasmus.

Similar presentations

Ads by Google