The team will meet two times. Each meeting is scheduled to last 1 week.
In the first meeting we will address the main achievements in the topic of investigation from observations, numerical simulations and theory (objectives 1 and 2). Through their own research, each member will present a review in their area within the context of partially ionised plasmas falling from coronal heights (45 min talk: 30+15 Q&A). Discussions will be held focusing on the possible interpretations and implications of the results (objective 3). Possible ways of collaboration will be discussed, which will be followed between the meetings. Furthermore, the structure of the review paper and the division of the material for the review paper will be discussed.
The second meeting will aim at presenting and discussing the results of the collaboration between the groups, and the compilation of the review text.
First meeting: 23-27 February 2015
CALENDAR:
Day 1: Monday 23 February
– Introduction (ISSI, Maurizio Falanga) 9:00 – 9:15
– Goals of the meeting, key questions (Patrick) 9:15 – 9:45
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(1) Observations of coronal rain in the solar atmosphere
– The “standard model” of coronal rain (non-flaring regions)
– Past and present observations of coronal rain in chromospheric lines + results from SST-IRIS campaigns (Luc) 9:30 – 10:15
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Break 10:15 – 10:30
– Results from the SST – IRIS campaign of Summer 2015 (Petra) 10:30 – 11:15
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– Observations of thermally unstable loops: EUV and UV variations associated to coronal rain (Gregal) 11:15 – 12:00
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– The multi-thermal and multi-stranded nature of coronal rain (Patrick) 12:00- 12:45
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Lunch 12:45 – 14:15
– Formation and evolution of coronal rain in AIA lines (Teimuraz) 14:15 – 15:00
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Break 15:00 – 15:30
– Discussion 15:30 – 17:30
– Set the important science questions / unsolved problems that will drive the main review.
– Constraints on coronal heating
– Implications from the morphology: substructure in loops
– Accretion problem
– Cutting-edge tool for solar research (field tracing)
– Welcome drink offered by ISSI 17:30
Day 2: Tuesday 24
Observations: Associated phenomena
– Material from prominence eruptions: similarities and differences (Wei, presented by Patrick) 9:30 – 10:00
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– Prominence/ coronal rain complexes (Wei/Patrick) 10:00 – 10:45
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Break 10:45 – 11:00
– Spectropolarimetry of coronal rain (Tom S.) 11:00 – 11:45
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– Supersonic events in TR lines (Lucia) 11:45 – 12:30
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Lunch 12:30 – 14:00
Observations: Coronal rain in post-flare loops
– EUV light curves from post-flare loops (Fabio) 14:00 – 14:45
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– Energy budgets in flares – observations with Hinode (Kyoko) 14:45 – 15:30
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Break 15:30 – 16:00
– Observations with SDO/HMI (Juan Carlos) 16:00 – 16:45
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Discussion 16:45 – 18:30
– How pervasive is coronal rain above active regions?
– What is its role in the atmospheric mass cycle?
-> Paper planning
Day 3: Wednesday 25
Observations: Other associated phenomena
– Flocculent flows (Gregal) 9:30 – 10:15
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– Sun and stellar accretion of cool plasma 10:15 – 10:45 (Fabio)
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Break 10:45 – 11:00
– Characteristic UV spectra from stellar accretion – coronal rain? (Fabio) 11:00 – 11:45
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(2) Physics of coronal rain
Instabilities & waves – lessons from theory and numerics (1)
– Multi-fluid MHD equations in partially ionized plasmas – effects from Helium on coronal rain dynamics (Teimuraz) 11:45 – 12:30
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Lunch 12:30 – 14:00
– Thermal instability in coronal loops – 1D & 1.5D MHD simulations (Xia/Patrick) 14:00 – 14:45
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– Multidimensional MHD simulations of coronal rain (Xia) 14:45 – 15:30
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Break 15:30 – 16:00
– Dynamics of rain blobs – fully and partially ionised plasmas (Ramón) 16:00 – 16:45
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– How does cool material appear at coronal heights? (Phil, via telecom?) 16:45 – 17:30
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– Discussion: 17:30 – 18:30
– How good is coronal rain as a tracer of the magnetic field?
– How well do simulations and observations of coronal rain / thermal instability agree?
– strand-like morphology of condensations: fundamental strands or a thermal instability effect?
– The problem of speeds lower than free-fall
Day 4: Thursday 26
Instabilities & waves – lessons from theory and numerics (2)
– Further seismological possibilities with coronal rain (Tom V.) 9:30 – 10:15
– Kinematics of rain in transversely oscillating loops (Erwin via telecom?) 10:15 – 11:00
Break 11:00 – 11:15
– Dynamical instabilities associated to coronal rain (Patrick/Xia) 11:15 – 12:00
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– Partial ionisation effects on resonant absorption and KHI development (Roberto) 12:00 – 12:45
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Lunch 12:45 – 14:15
Workshop – tools for rain analysis (optional)
– Intro to IRIS Analysis (Lucia) 14:15 – 15:00
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– Intro to Crispex (Gregal) 15:00 – 15:45
Break 15:45 – 16:15
Discussion: 16:15 – 18:30 (Wei joins through Telecom)
– General discussion
– Goals for next meeting and date setup
– Work distribution for the science review.
Day 5: Friday 27
Future prospects
– Future prospects with DKIST (Tom S.) 9:30 – 10:15
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– Future prospects with ALMA (Sven, via Telecom) 10:15 – 11:00
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– Future prospects with Solar-C (Kyoko) 11:00 – 11:45
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– Final discussion: 11:45 – 12:30