Spatial interactions in a modified Daisyworld model

We point out to the community an interesting paper by the UNICAL group on a modified version of the Daisyworld model. First author of the paper is the SWICo member Tommaso Alberti.

Link to the paper

daisyworldAbstract:

We investigate a modified version of the Daisyworld model, originally introduced by Lovelock and Watson to describe in a simple way the interactions between an Earth-like planet, its biosphere, and the incoming solar radiation, where spatial dependency, variable heat diffusivity, and greenhouse effect are explicitly taken into account.
In this way, we obtain a more realistic energy-balance model to investigate the evolution of the Earth’s climate by considering several influencing factors.

The model is based on a hypothetical planet, like the Earth, which receives the radiant energy coming from a Sun-like star, and is populated by two kinds of identical plants differing in their color: white daisies reflecting light and black daisies absorbing light. The interactions and feedbacks between the collective biota of the planet and the incoming
radiation form a self-regulating system where the conditions for life are maintained.

We show that the diffusion process is able to destabilize the system and plays an important role in setting the symmetry with respect to the equator. The greenhouse effect, modeled through a grayness function, affects the temperature evolution and contributes to self-regulating the planet climate, in agreement with observational data analysis.

The equilibrium state is significantly dependent on the initial conditions. The initial conditions of daisy
coverage influence the vegetation profiles although they do not significantly modify the temperature behavior. This implies that a different surface coverage by oceans, ice and vegetation can locally change their interactions, producing local micro-climate (similar to the climatic zones).
This model could be very useful in the framework of climate changes, due to its simplicity, to provide both global and local informations about temperature and biosphere changes.

URSI-ICTP School on Radio Physics

ursi-ictp

PDF file

TREASURE ITN positions

treasure

Dear colleagues,

I am pleased to inform you that we have 13 research posts that will be
soon made available in the scope of a new Marie Skłodowska-Curie
Innovative Training Network that I am leading. The project is called
TREASURE, standing for

*T*raining, *RE*search and *A*pplications network to *S*upport the
*U*ltimate *R*eal time high accuracy *E*GNSS solution

For details please see the attached pdf and feel free to circulate among potential candidates.

Marcio H O Aquino

TREASURE coordinator

Les Houches school of plasma physics announcement

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From laboratories to astrophysics: the expanding universe of plasma physics
Les Houches school of physics

Plasma physics plays a central role in many natural and man-made systems, from the vicinity of black holes to fusion experiments. This area of research is in fast development thanks to the strong interplay between experimental, theoretical, and numerical approaches. Long-standing challenges such as magnetic reconnection, turbulence, shocks, dynamo processes, or particle acceleration can now be tackled directly by a combination of these techniques. The goal of this school is to gather students and researchers from various communities (astrophysics, applied mathematics, fluid dynamics, fusion research) to provide a unified framework of plasma dynamics and to exchange new theoretical and experimental developments between these communities.

Session dates: May 1-12 2017

Program, registration & information

Post-doctoral Researcher Position at the ISSI

issi

Post-doctoral Researcher Position at the International Space Science Institute, Bern, Switzerland

The International Space Science Institute (ISSI), Bern, Switzerland is seeking to appoint a post-doctoral researcher for 2 years primarily to work on a Horizon 2020 project, MiARD, the Multi Instrument Analysis of Rosetta Data. The post will involve two main strands, namely:

  1. Assessment of the potential dangers to interplanetary spacecraft from cometary dust through the use of existing models such as ESA’s “Interplanetary Meteoroid Environment Model” (IMEM) by the updating of such models with new information derived from Rosetta data.
  2. Study of the development of gas and dust activity triggered by different volatiles when comet 67P was approaching the Sun through the analysis and interpretation of data from various Rosetta instruments.

These activities will involve working with collaborators at partner institutes in Switzerland, France and Germany and with staff at ISSI. The successful candidate will ideally have experience of relevant aspects of cometary science with most likely a background in planetary science, physics, chemistry or related subjects. A small amount of time will also be available for the candidate’s personal research. Involvement in ISSI’s programme of activities would also be possible (details at www.issibern.ch). This position is available for an immediate start. Salary and conditions of employment will be similar to those provided by the Swiss National Science Foundation.
The application should include a motivation letter, the curriculum vitae, the list of publications and the names, addresses and means of contact of three references, not exceeding 7 pages in total. It shall be addressed to ISSI, attn. Professor John Zarnecki, Hallerstrasse 6, CH-3012 Bern, Switzerland; email: john.zarnecki@open.ac.uk and John.Zarnecki@issibern.ch with copy to: Professor Rafael Rodrigo; email: r.rodrigo@issibern.ch

Submissions by email are preferred provided all the documents are in the form of a single PDF file.

All applications must be received by ISSI no later than January 31st, 2017.
For informal discussion and further details, please contact:
Professor John Zarnecki (J.C.Zarnecki@open.ac.uk) or
Professor Rafael Rodrigo (r.rodrigo@issibern.ch)

Positions: November 2016 (2)

From SolarNews

Employment Opportunities

  • Joint Tenure-track Faculty Position at the University of Colorado Boulder and the National Solar Observatory
  • FHNW, Switzerland — PhD Position in Heliophysics

 

 

Registration is open for the 7th Solar Orbiter workshop

solar_orbiter_payload_annotatedWe are happy to re-post here the announcement of the 7th Solar Orbiter workshop:

It is a pleasure to announce that the 7th SolO workshop Website is ready for registration and abstract submission. Please convey the news to as many colleagues as possible. A second announcement will appear in the next issues of SolarNews and SPA newsletters.
Deadline for abstract submission is 31 December. We are supposed to notify the authors on whether their contribution are oral or posters by mid January.

Positions: November 2016

From SolarNews

Employment Opportunities

Planetary space weather: scientific aspects and future perspectives

We announce to the community a recently published review-paper on planetary space weather. First author of the paper is the SWICo member Christina Plainaki.

Link to the paper

Abstract:

In this paper, we review the scientific aspects of planetary space weather at different regions of our Solar System, performing a comparative planetology analysis that includes a direct reference to the circum-terrestrial case. Through an interdisciplinary analysis of existing results based both on observational data and theoretical models, we review the nature of the interactions between the environment of a Solar System body other than the Earth and the impinging plasma/radiation, and we offer some considerations related to the planning of future space observations. We highlight the importance of such comparative studies for data interpretations in the context of future space missions (e.g. ESA JUICE; ESA/JAXA BEPI COLOMBO). Moreover, we discuss how the study of planetary space weather can provide feedback for better understanding the traditional circum-terrestrial space weather. Finally, a strategy for future global investigations related to this thematic is proposed.

Positions: October 2016

From SolarNews

o Kiepenheuer Institut fuer Sonnenphysik — Post Doctoral Position

o Istituto Ricerche Solari Locarno (IRSOL) Switzerland — Doctoral and Postdoctoral Positions in Solar Physics

o IUCAA, Pune — Vaidya-Raychaudhuri Post-Doctoral Positions

o IUCAA, Pune — Post-Doctoral Positions