Archive for the 'Working Group' Category

10
Mar
10

WG6: Particle Acceleration & Transport

Group Leader: Alexander Warmuth
Co-Leader: Rim Turkmani

The Presentations

(please contact the respective authors for questions or requests to use any content)

The aim of this group is to examine the theory versus the observations in particle acceleration by concentrating on observations that give us inference on the particle acceleration and transport mechanisms, as well as on theory and modelling of these processes. In their contributions, participants are encouraged to have in mind the interplay between observations and theory, i.e. theorists should point out predictions of their models that can be tested observationally, just as observers should clearly convey the constraints their observations provide for acceleration and transport mechanisms.

Some of the anticipated topics will include:

- implications of using improved particle transport and interaction models, such as alternatives to the Thick Target Model and consequences for interpreting HXR observations
- comparing the properties of different acceleration models
- acceleration and transport of electrons versus ions
- observational constraints from new analysis methods (electron maps,…)
- can acceleration models fulfill observational constraints beyond the mere
spectral index, such as total flux, timescales, or correlations between flux
and spectral index?

Draft Schedule

Google Calendar:  view it in your browser or import it into your favorite calendar software with this XML Calendar file (or iCal).

Draft schedule for working group 6

Draft Schedule (contributions are still being added)

Mon 2:00pm-3:30pm: Improved particle transportation & interaction models 1
effects of nonthermal recombination, numer of accelerated electrons

nonuniformly ionized target and return current
(Su, Holman)

Mon 4:00pm-5:30pm: Improved particle transportation and interaction models 2
effects of turbulence, and nonthermal recombination
(Hannah, Kontar, Mallik)

Tue 9:00am-10:30am: General particle acceleration 1
HXR and radio diagnostics, stochastic acceleration, acceleration at current sheets and nulls
(Vilmer, Chen, Guo, Zharkova)

Tue 11:00am-12:30am: General particle acceleration 2
HXR and radio diagnostics, beaming, IP propagation, beam kinetics
(Emslie,  Masson, Zharkova)

Wed 9:00am-10:30am: General particle acceleration 3
acceleration models, electron budgets
(Drake, Turkmani, Mann)

Wed 11:00am-12:30am: Ion acceleration
(Share/Murphy, Miller, Mann)

Wed 2:00pm-3:30pm: Energetics / thermal-nonthermal issues 1
thermal/nonthermal energetics and evolution
(Ning, Warmuth, Guo)

Wed 4:00pm-5:30pm: Energetics / thermal-nonthermal issues 2
themal plasma, heating, evaporation
(Liu, Chamberlin, Doschek)

10
Mar
10

WG5: Instrumental Issues

Group Leader: David Smith
Co-Leader: Gordon Hurford

The Presentations

(please contact the respective authors for questions or requests to use any content)

Hello, all,

Here are some of the outstanding issues off the top of my head; I’ll ask Gordon to edit or add to the list.  Please enter your own ideas in the comments, and in particular tell us your own priorities!  Finally, please weigh in on this question: do we want to limit the meeting times of the group so that some folks have time to attend other groups?  Or should we just expect people to wander in and out as they prefer?

  • Instrument response matrix of radiation-damaged detectors (front and rear)
  • Improving knowledge of relative normalization of the detector segments (for imaging)
  • Improvements to the gain solution at the level of < 0.1 keV, mostly for allowing study of energy shifts to the 6 keV line (this is the easiest of these problems to tackle, and it’s being worked on right now, but please tell me whether you find it important!)

best wishes,

David Smith

10
Mar
10

WG4: Multi-wavelength Observations

Group Leader: Ryan Milligan
Co-Leader: Lyndsay Fletcher

The Presentations

(please contact the respective authors for questions or requests to use any content)

This aim of this working group is to highlight the scientific advances that can be made by combining RHESSI observations with those from other longer wavelength instruments (e.g. those onboard Hinode, STEREO, GBOs and now SDO). Topics will include (but are not limited to):

  • flare-CME relationship
  • coronal HXR sources
  • chromospheric/HXR observations
  • radio emission

Participants are invited to outline their efforts in these areas in recent years, and are encouraged to highlight any outstanding issues and how they may be addressed using multi-wavelength observations during the increase in activity during Cycle 24.

Working group 4 draft schedule (subject to change)

In keeping with the informal nature of the workshop each speaker will be allotted 20 minutes (10+10) for their presentation. Discussion during each presentation is strongly encouraged.

Monday 2:00pm-3:30pm: VSO, DEM and SDO

Laszlo Etsei: Cloudy SolarSoftWare; pre-processing and visualizing solar data
Iain Hannah: Regularized inversion techniques for recovering DEMs
Amir Caspi/Jim McTiernan: RHESSI measurements of DEMs
Phil Chamberlin: SDO/EVE Observations of solar flares

Monday 4:00pm-5:30pm: EUV and X-ray diagnostics of Chromospheric Evaporation

Jeff Brosius: Chromospheric evaporation during a solar microflare using RHESSI and SOHO/CDS
Zongjun Ning: EUV and HXR evidence of chromospheric evaporation in a solar flare
Lyndsay Fletcher: Flare density diagnostics with Hinode/EIS
George Doschek: Measurements of the super-hot flare component using the Fe XXV and Fe XXVI lines at 1.8A

Tuesday 9:00am-10:30am: The Flare-CME Relationship

Claire Raftery: The association between solar flares and CMEs
Rui Liu: Loop shrinkage and implosions
Ryan Milligan: Particle acceleration during a plasmoid-looptop collision observed with RHESSI and STEREO
Juan Carlos Martinez Oliveros: Radio direction-finding, CMEs, particle acceleration and propagation

Tuesday 11:00am-12:30pm: HXR and UV Footpoint Motions

Chang Liu: Hard X-ray source dynamics and their relationship to the reconnection process
Yang Su: HXR and UV observations of a flare ribbons inside the umbra of a sunspot using RHESSI, TRACE and SOHO
Weiqun Gan: HXR footpoint motions
Wenjuan Liu: The correlation between HXR and UV footpoint emission

Wednesday 9:00am-10:30am: No talks

Kept free to allow people to attend the workshop on Visibilities

Wednesday 11:00am-12:30pm: No talks

Kept free to allow people to attend the workshop on Visibilities

Wednesday 2:00pm-3:30pm: HXR and Radio Observations of Solar Flares

Hazel Bain: HXR and radio emission from solar flares and jets
Lindsay Glesener: Coronal sources in occulted flares using RHESSI, and EUV and radio observations
Alexei Struminsky: Observations of resonance radio emission at 245 MHz as an indicator of electron acceleration and plasma heating
Qingrong Chen: Coronal HXR sources and Type III radio bursts during solar flares

Wednesday 4:00pm-5:30pm: Miscellaneous Multi-wavelength Observations

Nicole Vilmer: Tracing the magnetic connectivity between the solar surface, corona and interplanetary medium combining HXR and radio observations
Yan Xu: Multi-wavelength observations of solar flares
Natsuha Kuroda: The flare productivity of active regions
TBA:

Google calendar: View in browser (Click on “agenda” in top right corner) or import it into your favorite calendar software with this XML Calendar file (or iCal).

Figure: An image of the WG 4 schedule. Use the google calendar links to access the live calendar.

10
Mar
10

WG3: Gamma-rays and Ions

Group Leader: Albert Shih
Co-Leader: Alec MacKinnon

The Presentations

(please contact the respective authors for questions or requests to use any content)

We will focus on what RHESSI and other instruments can tell us about accelerated ions and relativistic electrons, primarily using gamma-ray observations.  We will also discuss other types of observations (e.g., neutrons or ENAs) that may provide new avenues of investigation.  Participants’ interests will shape the group; likely topics include:

  • the role of energetic ions in the flare process
  • relative elemental abundances in the various populations
  • diagnostics of deep-atmosphere conditions
  • the relationship between accelerated ions and electrons
  • the contribution of pion-decay products to high-energy emission
  • the connection between energetic particles in flares and CMEs

Working Group 3 Draft Schedule (subject to change)

Google calendar: View in browser or import it into your favorite calendar software with this XML Calendar file (or iCal).

Figure: An image of the WG 3 schedule. Use the google calendar links to access the live calendar.

09
Mar
10

WG2: Polarization, Directivity, & Albedo

Group Leader: Mark McConnell
Co-Leader: Eduard Kontar

The Presentations

(please contact the respective authors for questions or requests to use any content)

Measurements of the polarization, directivity and albedo of the solar flare hard X-ray flux can all be related to the angular distribution of the accelerated electrons.  Our group will focus on what the these measurements can tell us about the nature of the electron acceleration process.   We will consider the potential of these types of observations and evaluate what constraints the available data already place on acceleration models.  Our work will focus on the following :

  • How do beaming measurements impact our understanding of the acceleration process?
  • How do albedo measurements constrain the beaming of the accelerated particles?
  • A review of existing albedo measurements.
  • How do polarization measurements constrain the beaming of the accelerated particles?
  • A review of existing polarization measurements.
  • Prospects for future investigations.

DRAFT SCHEDULE:

The draft schedule can be viewed in your browser or imported into your favorite calendar software with this XML Calendar file (or iCal).

Working group 2 draft schedule

Monday, August 2
4:00 – 5:30 PM : X-Ray Albedo and Directivity

  • Introductory Remarks (McConnell)
  • Theoretical review of solar albedo (Kontar)
  • Observations of Directivity (Dickson)

Tuesday, August 3
11:00 – 12:30 PM :  Particle Acceleration and Beaming (JOINT SESSION WITH WG 6)

  • Relationship of  beaming to acceleration models (Emslie)

Wednesday, August 4
11:00 – 12:30 PM  :  X-Ray Footpoints

  • Visibilities and the lack of modulation in the finer grids (Hurford)
  • Footpoint size measurements (Dennis)
  • Effect of albedo on footpoint size (Kontar)
  • Theoretical & Observed Footpoint Sizes (Battaglia)
  • Comparison with EUV / Optical (Fletcher)

2:00 – 3:30 PM :  X-Ray Polarization

  • Review of polarization measurements (McConnell)
  • Review of polarization theory (Zharkova)

4:00 – 5:30 PM :  Summary Discussion

  • Review and discussion (McConnell / all)
22
Jan
10

WG1: RHESSI Imaging Techniques

Group Leader: Säm Krucker
Co-Leader: Pascal Saint-Hilaire

Visibility workshop page

(located on the RHESSI Wiki)

Google Calendar:  view it in your browser or import it into your favorite calendar software with this XML Calendar file (or iCal).

Figure: An image of the WG 1 schedule. Use the google calendar links to access the live calendar.

Working group 1 draft schedule (times might chance after coordination with other working groups)

Mon 2:00pm-3:30pm: RHESSI imaging comparison

Krucker+others: presentation of results
ALL: discussion & action items

Mon 4:00pm-5:30pm: New imaging algorithms

Massone: UV smooth: mapcenter and visibility surface oscillations
Piana/Allavena: HESPE
Bain/Krucker: two-step CLEAN

Tue 9:00am-10:30am: RHESSI observations of the X-ray limb of the Sun

Hudson/Hurford: introduction. For more information please have a look at:
http://sprg.ssl.berkeley.edu/RHESSI/rhessi_limb

Wed VIS day (joint with working group 5)

Wed 09:00am-10:30am: Introduction and Demo I

Hurford: VIS intro 25 min
Saint-Hilaire: VIS implementation 25 min
Saint-Hilaire: Demo I and Exercise I
Making images
roll bin selection 30 min

Wed 11:00am-12:30am: Demo II&III

Saint-Hilaire: Demo II & Exercise II
command line and
VIS manipulation 40 min
Schwartz: Visibility Pitfalls 25 min
Schwartz: Demo III 25 min

Wed 2:00pm-3:30pm: Demo IV

Massone: UV smooth & e VIS 20 min
Massone: Demo VI: e VIS 20 min
Hurford: Future 20 min

Wed 4:00pm-5:30pm: Science with VIS

Battaglia: footpoints 20 min
Caspi: thermal 20 min
DEMO V 10 min
others



10th RHESSI Workshop

About

The 10th RHESSI Workshop will take place from August 1-5th 2010 at the Historic Inns of Annapolis in Annapolis, Maryland.

Annapolis, Maryland

Image taken by fmorgen

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