All posts; Tags Include "Earth and Planetary Astrophysics"
- September 13, 2016
- 09:02 AM
- 435 views
An Analysis of Interplanetary Solar Radio Emissions Associated with a Coronal Mass Ejection by V. Krupar et al.*
by CESRA in Solar Radio Science
Type II and type III bursts are generated, via the plasma emission mechanism, when beams of suprathermal electrons interact with the ambient plasma generating radio emissions at the plasma frequency fp (the fundamental emission) or at its second harmonic 2fp (the harmonic emission) [see also previous CESRA highlights here and [...]... Read more »
V. Krupar et al. (2016) An Analysis of Interplanetary Solar Radio Emissions Associated with a Coronal Mass Ejection. Astrophys. J. Lett., 823, L5. info:/
- August 30, 2016
- 09:04 AM
- 349 views
On the thermal nature of 140 GHz emission from the 4 July 2012 solar flare by Yuriy Tsap et al.*
by CESRA in Solar Radio Science
The nature of the solar flare sub-THz emission (Kaufmann, 2012) with a positive spectral slope at 200-400 GHz is still not clear..... Read more »
Yuriy Tsap et al.*. (2016) On the thermal nature of 140 GHz emission from the 4 July 2012 solar flare. Advances in Space Research, 2016, 57, 1449. info:/
- August 29, 2016
- 10:38 AM
- 408 views
Ancient Mars was warm and wet, suggest UCL-led research team
by vitul in Think, Ask and Resolve
After the recent discovery of extensive fossilised riverbeds on Mars, the idea that the Red Planet could have been habitable 4 billion years ago has gained more traction.... Read more »
Davis, J., Balme, M., Grindrod, P., Williams, R., & Gupta, S. (2016) Extensive Noachian fluvial systems in Arabia Terra: Implications for early Martian climate. Geology. DOI: 10.1130/G38247.1
- August 23, 2016
- 09:02 AM
- 358 views
Bright 30 THz impulsive solar bursts by Pierre Kaufmann et al.*
by CESRA in Solar Radio Science
Impulsive 30 THz continuum bursts have been recently observed in solar flares, utilizing small telescopes with a unique and relatively simple optical setup concept (Kaufmann et al. 2015). The most intense burst was observed together with a GOES X2 class event on October 27, 2014, also detected at two sub-THz [...]... Read more »
Pierre Kaufmann et al. (2016) Bright 30 THz impulsive solar bursts . Journal of Geophys. Res. info:/
- August 16, 2016
- 09:04 AM
- 342 views
Decameter U-burst Harmonic Pair from a High Loop by Dorovskyy, Melnik, Konovalenko, Bubnov , Gridin, Shevchuk, Rucker, Poedts and Panchenko
by CESRA in Solar Radio Science
We discuss the results of recent observations of a solar U-burst harmonic pair in the frequency range 10-70 MHz, performed by the radio telescope UTR-2 ...... Read more »
Dorovskyy et al. (2016) Decameter U-burst Harmonic Pair from a High Loop by Dorovskyy et al. Solar Physics. info:/
- February 13, 2016
- 05:02 AM
- 967 views
Now we can hear the Universe
by TakFurTheKaffe in Tak Fur The Kaffe
The detection of gravitational waves produced by the collision of two black holes over 1 billion light years away confirms Einstein's vision of our Universe.... Read more »
Abbott, B., Abbott, R., Abbott, T., Abernathy, M., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R.... (2016) Observation of Gravitational Waves from a Binary Black Hole Merger. Physical Review Letters, 116(6). DOI: 10.1103/PhysRevLett.116.061102
- September 17, 2015
- 09:00 AM
- 1,532 views
The Martian: Getting Home Is Just Half The Problem
by Mark Lasbury in The 'Scope
"The Martian" movie opens soon! It's about an astronaut stranded on Mars who is trying to survive and find a way to get back home. But today, we humans here on Earth still have to think of clever ways to survive a trip to the red planet in the first place.... Read more »
Bamford, R., Kellett, B., Bradford, J., Todd, T., Benton, M., Stafford-Allen, R., Alves, E., Silva, L., Collingwood, C., Crawford, I.... (2014) An exploration of the effectiveness of artificial mini-magnetospheres as a potential solar storm shelter for long term human space missions. Acta Astronautica, 105(2), 385-394. DOI: 10.1016/j.actaastro.2014.10.012
Bamford, R., Gibson, K., Thornton, A., Bradford, J., Bingham, R., Gargate, L., Silva, L., Fonseca, R., Hapgood, M., Norberg, C.... (2008) The interaction of a flowing plasma with a dipole magnetic field: measurements and modelling of a diamagnetic cavity relevant to spacecraft protection. Plasma Physics and Controlled Fusion, 50(12), 124025. DOI: 10.1088/0741-3335/50/12/124025
Walsh, B., Foster, J., Erickson, P., & Sibeck, D. (2014) Simultaneous Ground- and Space-Based Observations of the Plasmaspheric Plume and Reconnection. Science, 343(6175), 1122-1125. DOI: 10.1126/science.1247212
- Astronomy
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- Computer Science / Engineering
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- August 6, 2015
- 01:22 AM
- 939 views
Best evidence yet for active volcanism on Venus?
by Paul Wren in Venus Dispatches
OverviewIn an article from Geophysical Research Letters, a team led by Eugene Shaygin used images taken by the Venus Monitoring Camera (VMC) aboard Venus Express to identify transient hot spots on the surface. These hot spots are located near very young (~10 Mya) volcanoes and rifts, and are suggestive of active lava flows.Even though the surface is generally obscured from view by the thick clouds, there is a transparent window through which light can pass in the near infrared wavelengths, and t........ Read more »
Shalygin, E., Markiewicz, W., Basilevsky, A., Titov, D., Ignatiev, N., & Head, J. (2015) Active volcanism on Venus in the Ganiki Chasma rift zone. Geophysical Research Letters, 42(12), 4762-4769. DOI: 10.1002/2015GL064088
Campbell, B., Campbell, D., Morgan, G., Carter, L., Nolan, M., & Chandler, J. (2015) Evidence for crater ejecta on Venus tessera terrain from Earth-based radar images. Icarus, 123-130. DOI: 10.1016/j.icarus.2014.11.025
- August 5, 2015
- 12:51 AM
- 878 views
Quick Look: Vertical profiles of H2O, H2SO4, and sulfuric acid concentration at 45–75 km on Venus
by Paul Wren in Venus Dispatches
An improved model for vertical profiles of water and sulfuric acid vapors as well as sulfuric acid concentrations in the Venus clouds is presented. From the April 2015 edition of Icarus:Title:Vertical profiles of H2O, H2SO4, and sulfuric acid concentration at 45–75 km on VenusAbstract:A method developed by Krasnopolsky and Pollack (Krasnopolsky, V.A., Pollack, J.B. [1994]. Icarus 109, 58–78) to model vertical profiles of H2O and H2SO4 vapors and sulfuric acid concentration in the Venus cloud........ Read more »
Krasnopolsky, V. (2015) Vertical profiles of H2O, H2SO4, and sulfuric acid concentration at 45–75km on Venus. Icarus, 327-333. DOI: 10.1016/j.icarus.2015.01.024
- July 20, 2015
- 11:05 AM
- 956 views
Quick Look: Touchdown on Venus: Analytic Wind Models and a Heuristic Approach to Estimating Landing Dispersions
by Paul Wren in Venus Dispatches
I'm working through a lot of recent Venus-related papers, so here's another morsel for you that I will not have time to read in depth (I'm prioritizing articles relating to the Venusian surface). The author created a straightforward model of winds on Venus (using data from the VEGA Balloons and the Pioneer descent probes) to determine entry and descent dispersions for future Venus landers. From the April 2015 edition of Planetary and Space Science:Title:Touchdown on Venus: Analytic wind models ........ Read more »
Lorenz, R. (2015) Touchdown on Venus: Analytic wind models and a heuristic approach to estimating landing dispersions. Planetary and Space Science, 66-72. DOI: 10.1016/j.pss.2015.01.003
- July 10, 2015
- 01:23 AM
- 732 views
Quick Look: Computer model shows imaging of Venus surface possible from balloon
by Paul Wren in Venus Dispatches
From the April 2015 edition of Solar System Research:Title:Resolving the surface details on Venus in the balloon- or lander-borne images with a computer modeling methodAbstract:Due to the presence of opaque clouds at high altitudes, it is difficult to survey the surface of Venus in the optical spectral range. At the same time, in the under-cloud layer, there are transparency windows at the wavelengths λ = 1.08, 0.85, and 0.65 μm. At these wavelengths, the gaseous absorption (in the whole atmos........ Read more »
Ekonomov, A. (2015) Resolving the surface details on Venus in the balloon- or lander-borne images with a computer modeling method. Solar System Research, 49(2), 110-113. DOI: 10.1134/S003809461502001X
- July 9, 2015
- 01:22 AM
- 857 views
Impact Crater Ejecta Mantling on Venusian Tesserae? Earth-based Radar Seems to Say Yes
by Paul Wren in Venus Dispatches
OverviewThe Smithsonian's Bruce Campbell and his colleagues (Campbell et al., 2015) combined radar imagery captured in 1988 and 2012 by the Arecibo and Greenbank radio telescopes to better detect the parabola-shaped deposits of impact crater ejecta on Venus. They were looking for such deposits on the highly-deformed terrain of tessera regions, which are suspected of having formed at a time when there was still water on the surface.Previous researchers had identified large parabolic deposits of ........ Read more »
Campbell, B., Campbell, D., Morgan, G., Carter, L., Nolan, M., & Chandler, J. (2015) Evidence for crater ejecta on Venus tessera terrain from Earth-based radar images. Icarus, 123-130. DOI: 10.1016/j.icarus.2014.11.025
- June 14, 2015
- 12:05 AM
- 948 views
Pluto and Planetary Pinball
by Angela Reisetter in Steeped in Science
A description of the formation of the solar system and how we think it got to be how it is today, with a focus on Pluto and Kuiper belt.... Read more »
Thayne Currie, Carey M. Lisse, Marc J. Kuchner, Nikku Madhusudhan, Scott J. Kenyon, Christian Thalmann, Joseph Carson, & John H. Debes. (2015) Direct Imaging and Spectroscopy of a Young Extrasolar Kuiper Belt in the Nearest OB Association. Astrophysical Journal Letters. arXiv: 1505.06734v1
Konstantin Batygin, & Gregory Laughlin. (2015) Jupiter's Decisive Role in the Inner Solar System's Early Evolution. Proceedings of the National Academy of Sciences. arXiv: 1503.06945v2
- March 31, 2015
- 08:00 AM
- 1,477 views
Shields Up! Lay In A Course For Mars
by Mark E. Lasbury in The 'Scope
Deflector shields allowed Star Trek and other sci-fi franchises to have long space battles. Without them, one good strike and everyone was dead – that wouldn’t lend itself to sequels.
We don’t need shields for space battles yet, but we do need them to get to Mars. Cosmic radiation will kill or injure every astronaut unless we can deflect the radiation away from the spacecraft. We’re just about to build real deflectors, and our teachers are the magnetic fields we find ........ Read more »
Bamford, R., Kellett, B., Bradford, J., Todd, T., Benton, M., Stafford-Allen, R., Alves, E., Silva, L., Collingwood, C., Crawford, I.... (2014) An exploration of the effectiveness of artificial mini-magnetospheres as a potential solar storm shelter for long term human space missions. Acta Astronautica, 105(2), 385-394. DOI: 10.1016/j.actaastro.2014.10.012
Bamford, R., Gibson, K., Thornton, A., Bradford, J., Bingham, R., Gargate, L., Silva, L., Fonseca, R., Hapgood, M., Norberg, C.... (2008) The interaction of a flowing plasma with a dipole magnetic field: measurements and modelling of a diamagnetic cavity relevant to spacecraft protection. Plasma Physics and Controlled Fusion, 50(12), 124025. DOI: 10.1088/0741-3335/50/12/124025
Walsh, B., Foster, J., Erickson, P., & Sibeck, D. (2014) Simultaneous Ground- and Space-Based Observations of the Plasmaspheric Plume and Reconnection. Science, 343(6175), 1122-1125. DOI: 10.1126/science.1247212
- Astronomy
- Medicine
- Computer Science / Engineering
- Geosciences
- Physics
- High-Energy Physics
- Plasma Physics
- Pathology
- Aerospace Engineering
- Electrical Engineering
- Mechanical Engineering
- Materials
- Earth and Planetary Astrophysics
- Applied Physics
- Instrumentation and Methods for Astrophysics
- Astrophysics
- Atmosphere Science
- Atomic Physics
- April 13, 2014
- 01:56 PM
- 1,560 views
Intro to External Pulsed Plasma Propulsion (EPPP)
by Jason Carr in Wired Cosmos
External Pulsed Plasma Propulsion (EPPP) is something that’s been discussed for some time. In fact, it was originally proposed by Stanislaw Ulam way back in 1947. Unfortunately the public perception of atomic technology as well as pieces of otherwise well meaning legislation have called into question the feasibility of spacecraft that operate using this advanced … Read More →... Read more »
J.A. Bonometti, & P. Jeff Morton. (2012) External pulsed plasma propulsion (EPPP) analysis maturation. 36th AIAA Joint Propulsion Conference. DOI: 10.2514/6.2000-3610
- February 5, 2014
- 11:43 AM
- 1,313 views
Solving a 30-Year-Old Problem in High Mass Star Formation
by Jason Carr in Wired Cosmos
Some 30 years ago, astronomers found that regions of ionized gas around young high mass stars remain small (under a third of a light-year) for ten times longer than they should if they were to expand as expected in simple models. Recent supercomputer simulations predicted that these regions actually flicker in brightness over this period … Read More →... Read more »
C. G. De Pree, T. Peters, M.-M. Mac Low, D. J. Wilner, W. M. Goss, R. Galván-Madrid, E. R. Keto, R. S. Klessen, & A. Monsrud. (2014) Flickering of 1.3 cm Sources in Sgr B2: Toward a Solution to the Ultracompact H II Region Lifetime Problem. The Astrophysical Journal Letters, 781(L36). DOI: 10.1088/2041-8205/781/2/L36
- November 5, 2013
- 07:43 AM
- 1,335 views
What White Dwarfs Can Tell Us About the Universe
by Jason Carr in Wired Cosmos
Researchers from Europe and the U.S. have ruled out a multitude of possible parameters for dark photons - a type of dark matter and energy - with the help of white dwarfs. In some aspects, the shining of these dying stars gives more information on dark forces than is provided by earth-based laboratories. The journal … Read More →... Read more »
Herbert K. Dreiner, Jean-François Fortin, Jordi Isern, & Lorenzo Ubaldi. (2013) White Dwarfs constrain Dark Forces. Phys. Rev. D, 88(4). DOI: 10.1103/PhysRevD.88.043517
- October 25, 2013
- 11:40 AM
- 2,073 views
What Aliens From Another World Will Look Like
by Jason Carr in Wired Cosmos
Invading aliens from outer space won’t look like a Lady Gaga zombie or creatures with serious nasal drip problems. Top planetary scientists have now come up with different sketches of how aliens might appear. Here, then, are what real aliens will most likely look like if they drop on your house. First, the alien won’t … Read More →... Read more »
Ricardo Cavicchioli. (2004) Extremophiles and the Search for Extraterrestrial Life. Astrobiology, 2(3), 281-292. DOI: 10.1089/153110702762027862
Cosmovici, C., Pluchino, S., Salerno, E., Montebugnoli, S., Zoni, L., & Bartolini, M. (2007) Radio Search for Water in Exo-Planetary Systems. Extreme Solar Systems, 33. info:/
Ziurys LM. (2006) The chemistry in circumstellar envelopes of evolved stars: following the origin of the elements to the origin of life. Proceedings of the National Academy of Sciences of the United States of America, 103(33), 12274-9. PMID: 16894164
- October 16, 2013
- 10:45 AM
- 1,389 views
How the Largest Known Star is Tearing Itself Apart
by Jason Carr in Wired Cosmos
An international team of astronomers has observed part of the final death throes of the largest known star in the Universe as it throws off its outer layers. The discovery, by a collaboration of scientists from the UK, Chile, Germany and the USA, is a vital step in understanding how massive stars return enriched material … Read More →... Read more »
Nicholas J. Wright, Roger Wesson, Janet E. Drew, Geert Barentsen, Michael J. Barlow, Jeremy R. Walsh, Albert Zijlstra, Jeremy J. Drake, Jochen Eisloffel, & Hywel J. Farnhill. (2013) The Ionized Nebula surrounding the Red Supergiant W26 in Westerlund 1. Monthly Notices of the Royal Astronomical Society. arXiv: 1309.4086v1
- October 1, 2013
- 09:32 AM
- 1,316 views
New Estimate of Amount of Water on Surface of Mars
by Jason Carr in Wired Cosmos
NASA’s rover Curiosity, which landed on the surface of Mars on 6 August 2012, has led to more detailed estimates of the amount of water on the Martian surface. The Finnish Meteorological Institute is part of the NASA research team. A study published in the magazine Science on 27 September reveals that according to observations made by … Read More →... Read more »
Meslin PY, et. al. (2013) Soil Diversity and Hydration as Observed by ChemCam at Gale Crater, Mars. Science (New York, N.Y.), 341(6153), 1238670. PMID: 24072924
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