je crois me souvenir que cela avait été annoncé il y a quelques année, lors de l'impact sur (je sais plus quel planete) où l'on indiquait que la technique évoluant.. ont détecterait plus d'objet... donc, on en verrait plus qu'avant...
yeti
La grande majorité des NEA (Near-Earth Asteroids) sont localisés par le JPL NEAT, un département au sein du fameux JPL.
Au début de cette initiative, le JPL NEAT utilisait un télescope de l'US Air Force qui se trouve dans je sais plus quel cratère d'un volcan (dans les îles Hawaï je crois). Le problème c'est que ce télescope est utilisé pour répertorier et observer tous les satellites artificiels qui gravitent autour de la Terre, sa disponibilité pour le JPL NEAT était donc assez réduite (quelques nuits par mois). Depuis quelques années, un 2ème système de localisation de NEA a été déployé au Mont Palomar en Californie.
En conclusion, on surveille beaucoup plus le ciel comparé à il y a quelques années.
Steph
M51M51 Taïkionaute
Inscrit le: 01 Juin 2004
Messages: 243
Posté le:
Jeu Juin 12, 2008 11:54 pm
Il est intéressant de noter que parmi les théories catastrophiques concernant Nibiru/Némésis certaines s'appuient sur les interactions que cette hypothétique naine brune puisse avoir sur notre étoile. L'hypothèse est la suivante. Les interactions iraient crescendo lors de l'approche du périhélie. La compagne du soleil, en s'approchant de celui-ci, l'activerait, le boosterait si bien que le passage s'enrichirait de déclenchements à répétition de bouffées d'énergie (Coronal Mass Ejection: CME's, flare radio, X, gamma) inondant l'espace environnant de photons et de particules énergétiques qui viendraient s'écraser sur les boucliers des différentes planètes provoquant des phénomènes cataclysmiques. Un véritable feu d'artifice où les ceintures de Van Allen seraient rudement mises à l'épreuve et où l'ionosphère se chargerait de façon si intense que des phénomènes électriques du type éclairs, Elve Sprite, TGFT couvriraient la planète, alimenteraient la dynamo Terrestre et provoqueraient des courants d'induction tels que le moindre matériel conducteur deviendrait par effet joule un véritable radiateur. La caisse de résonance terrestre, notre résonance de Schumann, serait portée alors à une fréquence inédite. Le son de l'électron contribuerait à la symphonie de l'apocalypse et la Terre tremblerait sous l'impulsion conjuguée des tensions libérées par les courants créés et les vibrations propagées. A première lecture, cette hypothèse parait tirée du chapeau. Puis en réfléchissant bien et en observant l'intense activité d'observation dont bénéficie le soleil ces temps-ci, on est en droit de se poser quelques questions, d'autant plus qu'il n'y a pas que la Terre qui fait l'objet d'un réchauffement, mais tout le système solaire et que celui-ci semble bien perturbé, surtout les pôles sud! Il est intéressant de noter que les acteurs de cette surveillance attentive ne sont pas uniquement du domaine civil mais que l’on reconnaît les habitués du complexe militaro industriel (DoD, DARPA, firmes du complexe militaro industriel, etc.)
Faisons un point non exhaustif des dispositifs en place et pour commencer un aperçu de la météo solaire et des prévisions, un site à retenir :
http://www.lmsal.com/solarsites.html
Sun-to-Earth Modeling
Models involving the fully connected Sun-to-Earth system make it possible to simulate geomagnetic activity caused by solar activity with one code.
The goal is to provide a model
that can be used for space weather analyses and forecasting.
The Transition Region and Coronal Explorer is a NASA Small Explorer (SMEX) mission to image the solar corona and transition region at high angular and temporal resolution
A UV/Optical deep-space telescope to image stars and observe the Universe with 0.1 milli-arcsec resolution
To enable an understanding of solar/stellar magnetic activity and its impact on the:
origin and continued existence of life in the Universe
structure and evolution of stars
habitability of planets
and [B]to study magnetic processes
and their roles in the origin and evolution of structure and the transport of matter throughout the Universe
One big puzzle revealed by previous flybys is the temperature of the sun's poles.
In the previous solar cycle,[B]the magnetic north pole was about 80,000 degrees or 8% cooler than the south. Why should there be a difference?
No one knows.
The current flyby may help solve the puzzle because it comes less than a year after a similar South Pole flyby in Feb. 2007. Mission scientists will be able to compare temperature measurements, north vs. south, with hardly any gap between them.
Ulysses also discovered the sun's high-speed polar wind. "At the sun's poles, the magnetic field opens up and allows solar atmosphere to stream out at a million miles per hour," says Smith.
By flying around the sun, covering all latitudes in a way that no other spacecraft can, Ulysses has been able to monitor this polar wind throughout the solar cycle--and it is acting a bit odd.
Posner explains: "Eleven years ago, during a similar 'sea change' between solar cycles, the polar wind spilled down almost all the way to the sun's equator. But this time it is not.
The polar wind is bottled up, confined to latitudes above 45 degrees: data."
Is this a detail of little importance or a major anomaly, signaling new things to come?
Again, no one knows,
and that's why now is a good time to visit the sun's North Pole. "We'll be monitoring the magnetic field above the north pole to see what it's like during the change of solar cycles."
Décidément la sonde Ulysses aura apporté quelques perles de l’inexpliqué. Voilà qu’après la détection du brusque changement d’orientation du flux de poussières elle met aussi en évidence un décalage dans l’activité solaire entre le pôle sud du soleil (plus chaud) que le pôle nord. Et si tout cela était dû à l’arrivée de notre compagnon(
Brown magnetic dwarft star[2]
) qui justement se ferait par le sud (voir carte ci-après) ?
Représentation de l’orbite de la sonde Ulysses (schéma du dessus) et de l’orbite calculée pour Nibiru/Némésis (arrivée par le dessous de l’écliptique, source youusa). A titre indicatif la situation année par année est indiquée. On remarquera notamment la position d’Ulysses en 2007 à rapprocher des détections de poussières interstellaires…
On pourrait alors s’attendre à un décalage dans l’activité solaire, l’hémisphère sud devenant de plus en plus actif par rapport au nord. Un même phénomène pourrait être observé pour les planètes.
Il est temps qu’Ulysses passe la main, du moins au niveau public![1].
Geostationary Operational Environmental Satellites (GOES)-R Series, which will provide important information on solar activity and the effects of the Sun on the earth and the near-earth space environment.
Ce satellite accueille quelques équipements intéressants!
SXI:
Solar X-Ray Imager (SXI)
Hinode is the follow-up mission to the very successful Japan/UK/US Yohkoh mission. Using a combination of optical, EUV and X-ray instrumentation Hinode will study the interaction between the Sun's magnetic field and its corona to increase our understanding of the causes of solar variability. Hinode was launched successfully in September 2006.
SOT:
Citation:
Solar Optical Telescope on Hinode
The Lockheed Martin Solar and Astrophysics Laboratory developed the Focal Plane Package (FPP) for Hinode to work in conjunction with the Optical Telescope Assembly (OTA) to form the Solar Optical Telescope (SOT). Together they provide an unprecedented view of the magnetic fields in the solar photosphere.
The Extreme-ultraviolet Imaging Telescope (EIT) will provide wide-field images of the corona and transition region on the solar disc and up to 1.5 R above the solar limb. Its normal incidence multilayer-coated optics will select spectral emission lines from Fe IX (171 Å), Fe XII (195 Å), Fe XV (284 Å), and He II (304 Å) to provide sensitive temperature diagnostics in the range from K to K.
Solar MURI is a collaborative project studying magnetic eruptions on the Sun and their effects on the Earth's space environment. ("MURI" stands for Multidisciplinary University Research Initiative, a research program funded by DoD.) The aim of the project is to improve our ability to predict space weather from solar observations.
Citation:
The project will construct a series of physically connected, observationally tested models of the Sun and its interplanetary environment. These models will allow us to use observations of the Sun's atmosphere and magnetic configuration to determine:
When a magnetic eruption is imminent
If that magnetic eruption will impact the Earth's space environment
Whether this will result in a Solar Energetic Particle (SEP) bombardment and/or a geomagnetic storm
Ultimately, our goal is to provide several extra days of notice prior to an SEP event or geomagnetic storm.
Solar Probe +
Une sonde au plus près pour anticiper ?
June 10, 2008: For more than 400 years, astronomers have studied the sun from afar. Now NASA has decided to go there.
http://solarprobe.gsfc.nasa.gov/
Citation:
"We are going to visit a living, breathing star for the first time," says program scientist Lika Guhathakurta of NASA Headquarters. "This is an unexplored region of the solar system and the possibilities for discovery are off the charts."
Citation:
It's a heat-resistant spacecraft designed to plunge deep into the sun's atmosphere where it can sample solar wind and magnetism first hand. Launch could happen as early as 2015. By the time the mission ends 7 years later, planners believe Solar Probe+ will solve two great mysteries of astrophysics and make many new discoveries along the way.
The probe is still in its early design phase, called "pre-phase A" at NASA headquarters, says Guhathakurta. "We have a lot of work to do, but it's very exciting."
Johns Hopkins' Applied Physics Lab (APL) will design and build the spacecraft for NASA.
APL already has experience sending probes toward the sun. APL's MESSENGER spacecraft completed its first flyby of the planet Mercury in January 2008 and many of the same heat-resistant technologies will fortify Solar Probe+. (Note: The mission is called Solar Probe plus because it builds on an earlier 2005 APL design called Solar Probe.)
At closest approach, Solar Probe+ will be 7 million km or 9 solar radii from the sun. There, the spacecraft's carbon-composite heat shield must withstand temperatures greater than 1400o C and survive blasts of radiation at levels not experienced by any previous spacecraft.
Et pour finir l’intelligence artificielle au service du soleil. L’hippocampe solaire, cheval de Troie du cône de prévision?
Citation:
Helio-informatics: Information technology for Solar Physics
Helio-informatics explores, adapts and adopts new information technologies for the benefit of the solar physics research community.
“The Collaborative Sun-Earth Connector;” and as collaborators in the Virtual Solar Observatory and Virtual Heliospheric Observatory.
Sensorweb technology developed for
DARPA
Distributed and networked set of Nodes providing
information collection, fusion and dissemination
capabilities/services
• A Node is a collection of resources (sensors, hw), services
and data
– Managed and controlled by PI (ground agent) or science team
– Our focus is on the Sensorweb at the Information
processing/data Services level of abstraction
• Information fusion
– Collaboration and coordination of the information nodes to
meet a PI’s goals
• goal constraints driven reactive push or
• process driven pull
Flotilla of spacecraft from “Sun to mud”
– 5-10 spacecraft
– ~5 Instruments/spacecraft
A magnetospheric physicist analyzes proton fluxes
measured in the magnetosphere in the context of
specific solar flares observed by the Solar Sentinels
and Solar Dynamics Observatory (SDO)
Collaborative Sun-Earth Connector ( CoSEC) Architecture
Based on the Sensorweb Concept
• Sensorweb Virtual Machine (SVM)
– Agent-based middleware (container)
– Agents for mediating interactions between the data
sources, sensors, processing services, and scientists
– SVM Enabled Sensorweb Nodes (S-Nodes).
• Semantic markup of user-profiles, resources, processing
services, and data using DAML
– For Composition within S-Node
– For discovery by other S-Nodes or agents
• Enabling Technology
– Semantic description of services and data
– Software agents
CoSEC 0.1 Prototype
– Improved user interface
– Expand Geospace services
• CoSEC 1.0 Testbed
– Asynchronous and Reactive Coordination and
Cooperation of distributed scientists
– Integration with EGSO & VSO Infrastructure
– Extend ontologies to describe science processing
services, instruments and data
– Extend to include to Sensor services
Et si les épisodes catastrophiques étaient finalement un passage commun à toutes les formes de vie en développement. Une sorte d'étape « sélective » où pour s'en sortir il faudrait développer un certain nombre de qualités intrinsèques comme l’entraide, l'altruisme, le partage et l'amour, la compréhension de l’altérité, des capacités symbiotiques, une intelligence proto dimensionnelle ouverte sur le monde et une formidable énergie pour transformer l'apocalypse annoncée en un nouveau départ. Ceux qui réussiraient auraient droit à leur entrée dans le plérome et à leur place dans la galaxie. Pour les autres qui ne seraient pas encore prêts, ce serait le retour à la case départ, une sorte de RAZ de la création pour remettre sur pied une humanité digne de ce nom. Il ne s'agirait pas de la main de dieu mais simplement d'une mécanique de sélection qui permettrait aux ethnies démontrant les capacités compatibles avec l'harmonie du cosmos de progresser. Pour les autres inventions de la création, celles qui visiblement se seraient écartées du chemin, la sentence serait irrévocable. Retour à la case départ. Et pour les petits malins qui profitant d'une expérience passée, ayant confisqué les données pour leurs égotiques pensées, s’imaginant pouvoir se faufiler à travers les mailles du filet, un traitement spécial serait réservé à ces ingrats de la connaissance et du partage au sein de l'humanité.
Les lois du cosmos seraient inflexibles. Nous aurions le choix, la fenêtre entrebâillée d’une humanité renouvelée montrerait le chemin étoilé, celui du progrès dans la spiritualité, une possibilité de sauter dans la multiplicité pour le plus grand bonheur de l’unité ou de refermer cette éventualité sur notre destinée.
Le pire n’est jamais certain, mais certains l’empirent.
[1]
Citation:
Ulysses, the end of an extraordinary mission
After more than 17 years relentlessly exploring the effects of solar
activity on the space that surrounds us, the Ulysses mission is now
approaching its end. Representatives of the media are invited to a
joint ESA/NASA press conference on 12 June 2008 taking place at ESA
Headquarters in Paris, France, to hear about the achievements that will
form the Ulysses legacy.
Ulysses, a pioneering ESA/NASA mission, was launched in October 1990 to
explore uncharted territories _ the regions above and below the Sun's
poles
- and study our star's sphere of influence, or heliosphere, in the four
dimensions of space and time.
Originally designed for a lifetime of five years, the mission has
surpassed all expectations. The reams of data Ulysses has returned have
forever changed the way scientists view the Sun and its effect on the
space surrounding it.
Media representatives interested in attending the press conference are
invited to register using the attached form. Those not able to attend
will have the opportunity to follow the press conference using the
following phone number: +33 1 56785733 (listening-mode only).
The programme of the event is as follows:
The Ulysses Legacy Press Conference
12 June 2008, 15:30, Room 137,
ESA Headquarters, 8-10 rue Mario-Nikis, Paris
Event programme
15:30
Welcome, by David Southwood, ESA Director of Science and Robotic
Exploration (with a joint ESA/NASA statement)
15:40
Ulysses: a modern-day Odyssey, by Richard Marsden, ESA Ulysses Project
Scientist and Mission Manager
15:50
The Ulysses scientific legacy: Inside the heliosphere, by Richard
Marsden, ESA Ulysses Project Scientist and Mission Manager
16:00
The Ulysses scientific legacy: Outside the heliosphere, by Ed Smith,
NASA Ulysses Project Scientist
16:10
Ulysses, the over-achiever: challenges and successes of a 17-year-old
mission, by Nigel Angold, ESA Ulysses Mission Operations Manager
16:20
Questions and Answers, Panelists: David Southwood, Richard Marsden, Ed
Smith, Nigel Angold and Ed Massey (NASA Ulysses Project
Manager)
The idea of an unseen companion as an explanation for the star's magnetism is an intriguing one, says Berger, but no such object has yet been detected. "The main idea to consider here is an analogy to other systems where the presence of a companion directly or indirectly excites magnetic activity," he said.
Like other ultracool dwarf stars, TVLM513-46546 is an M-type star with surface temperatures below about 2400K (2127 Celsius) and a mass of only 8 to 10% that of our Sun. The luminosity of the star is only 0.02% of the Sun-a G-type star with an average surface temperature of 6000K (5727 Celsius).
In the Sun, the magnetic field is produced by a dynamo that arises from a complex transfer of heat from the center to the surface by radiation and convection.
By contrast, an ultracool dwarf like TVLM513-46546 transports heat only by convection, like water boiling in a pot. Such a simple structure has been predicted to generate a very basic magnetic field structure, perhaps more like the Earth's than the complex fields we see on the Sun. Why TVLM513-46546 has such a complex field and activity remains to be studied.
To find out if this star is an oddity, or a typical prototype of ultracool dwarfs, the researchers plan to continue observations of other such stars. Berger also notes that he would like to get more observations to try and spot any possible companions to such stars.
"The issue of a possible companion is really pure speculation at this point," he said. "However, I am trying to get observations that will assess this possibility." These results will be published in the February 10, 2008, issue of the Astrophysical Journal.
si c'est pas faké il ya peu d'objet qui "s'enflamment" si loin du soleil...
rien que cela demande explication
anakin_nEo Belliger luminis
Inscrit le: 07 Janvier 2004
Messages: 18652
Localisation: gg
Posté le:
Mar Juil 08, 2008 4:12 pm
ce qui est egalement interessant est
"However, in December 2007, a troubling trend emerged. Secretive teams of researchers began arriving at the Station on non-stop C-130 flights from the US. While the distance is considerable, it is manageable, given that the C-130 is a military transport with mid-air refueling capabilities.
Christopher reported that his New Zealand merchants were hearing stories from non-American researchers, stating that these SPT Mystery Teams were showing up unannounced on non-stop flights to work for brief periods at the SPT. During those episodes, the SPT Mystery Teams kept to themselves and then left as they had come.
Given that the Amundsen-Scott South Pole Station is a large, civilian international research base, the mysterious comings and goings of these special US teams was obviously troubling for civilian researchers from other countries.
"
nouchka Rose des sables
Inscrit le: 25 Janvier 2005
Messages: 8377
Localisation: ma
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