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  • January 17, 2017
  • 07:03 AM
  • 94 views

Simultaneous near-Sun observations of a moving type IV radio burst and the associated white-light CME by K. Hariharan et al.*

by CESRA in Solar Radio Science

Quasi-continuum radio emissions of duration ~10-60 min that occur along with flares and coronal mass ejections (CMEs) in the solar atmosphere are termed as type IV bursts. The bursts are non-thermal in nature and can be classified into two categories, i.e. moving type IV (type IVm) bursts and stationary type [...]... Read more »

  • January 3, 2017
  • 07:01 AM
  • 155 views

Observation of quasi-periodic solar radio bursts associated with propagating fast-mode waves by C. R. Goddard et al.*

by CESRA in Solar Radio Science

Flaring activity on the Sun triggers waves and oscillations in the solar corona. The study of these waves and oscillations allows comparisons to magnetohydrodynamic (MHD) theory and modelling to be made, and seismological inversions based on this comparison allow local plasma parameters to be measured indirectly (e.g. De Moortel & [...]... Read more »

  • December 27, 2016
  • 02:04 PM
  • 256 views

Why we have not met Aliens yet?

by Usman Paracha in SayPeople

A huge of number of people keeps on thinking about the existence of some other intelligent beings in the universe but still we have not met any aliens. Why?

Earth is rare

Earth is special planet

One of the reasons that we have not met aliens is that Earth is rare and there is nothing just like Earth in the universe. In this regard, Paleontologist Peter Ward and astronomer Donald Brownlee presented the Rare Earth Hypothesis about 17 years ago.

According to the Rare Earth Hypothesis, t........ Read more »

Heller, R., & Armstrong, J. (2014) Superhabitable Worlds. Astrobiology, 14(1), 50-66. DOI: 10.1089/ast.2013.1088  

  • December 20, 2016
  • 07:02 AM
  • 230 views

Diagnosing the Source Region of a Solar Burst on 26 September 2011 by Using Microwave Type-III Pairs by Tan B. L. et al.*

by CESRA in Solar Radio Science

Accelerated electron beams are believed to be responsible for both hard X-ray (HXR) and strong coherent radio emission during solar flares. However, so far the location of the electron acceleration and its physical parameters are poorly known. The solar microwave Type-III pair burst is possibly the most sensitive signature of [...]... Read more »

  • December 13, 2016
  • 08:23 AM
  • 255 views

Acceleration of electrons in the solar wind by Langmuir waves produced by a decay cascade by Catherine Krafft and Alexander Volokitin

by CESRA in Solar Radio Science

It was recently reported that a significant part of the Langmuir waveforms observed by the STEREO satellite (Graham and Cairns, 2013) during type III solar radio bursts are likely consistent with the occurrence of electrostatic decay instabilities, when a Langmuir wave \(\mathcal{L}\) resonantly interacts with another Langmuir wave \(\mathcal{L}^{\prime}\) and [...]... Read more »

  • December 9, 2016
  • 07:18 PM
  • 275 views

The Most Interesting Stellar System Of All?

by Jeffrey Daniels in United Academics

Researchers at the Carnegie Institution of Washington re-examined the Kepler data and determined that it had also been steadily dimming over the course of those four years, on top of its sporadic dips in brightness. For 1,000 days, the rate of dimming observed was constant; then, for 200 days after, its dimming rate suddenly increased by some order of magnitude; finally, for the remaining 200 days, its brightness had remained largely unchanged.... Read more »

Boyajian, T., LaCourse, D., Rappaport, S., & et al. (2016) Planet Hunters IX. KIC 8462852 – where's the flux?. Monthly Notices of the Royal Astronomical Society, 457(4), 3988-4004. DOI: 10.1093/mnras/stw218  

Montet, B., & Simon, J. (2016) KIC 8462852 FADED THROUGHOUT THE MISSION . The Astrophysical Journal, 830(2). DOI: 10.3847/2041-8205/830/2/L39  

  • December 6, 2016
  • 07:08 AM
  • 199 views

Source regions of the type II radio burst observed during a CME–CME interaction on 2013 May 22 by P. Mäkelä et al.*

by CESRA in Solar Radio Science

Occasionally the Sun ejects a pair of magnetized plasma clouds, called coronal mass ejections (CMEs), roughly into the same propagation direction in closely timed sequence. If the second CME is faster than the first one, the CMEs could either just slip through each other or they could collide and interact, [...]... Read more »

  • November 29, 2016
  • 07:02 AM
  • 244 views

Simultaneous Submillimeter and Hard X-Ray Intermittent Processes during Flares by Guillermo Giménez de Castro et al.*

by CESRA in Solar Radio Science

Intermittency is a disruptive characteristic of a process, which can be associated, in many cases, with a sudden energy release. Intermittency is a key characteristic of flares that should become evident in the flux time evolution at many different wavelengths. We investigate the similarities and differences of the intermittency during [...]... Read more »

  • November 22, 2016
  • 07:03 AM
  • 271 views

Energetic electrons generated during solar flares by Gottfried Mann

by CESRA in Solar Radio Science

The Sun is an active star. It manifests not only in everybody’s well-known Sun spots with the related 11-year cycle. This activity manifests not only as the well-known sun spot phenomenon with a related 11-year cycle, but also in flares, coronal mass ejections (CMEs), and solar energetic particle (SEP) events. Thus, [...]... Read more »

Gottfried Mann. (2016) Energetic electrons generated during solar flares. Journal of Plasma Physics. info:/

  • November 18, 2016
  • 08:31 AM
  • 347 views

Is anybody out there? Talking to the Galactic Zookeepers

by gdw in FictionalFieldwork

The Zoo Hypothesis Hello? Anybody out there in the starry skies? If there are extra-terrestrial civilizations, why haven’t we heard from them yet? The sheer magnitude of the universe with its billions upon billions of stars has led many to suggest that life must have arisen more than once in the cosmos. Some have gone […]... Read more »

  • November 15, 2016
  • 07:05 AM
  • 263 views

Solar Type III Radio Bursts: Directivity Characteristics by G. Thejappa and R. J. MacDowall

by CESRA in Solar Radio Science

Type III radio bursts are a group of fast drifting radio emissions associated with solar flares [see also previous CESRA highlights on type III bursts here and here]. These radio emissions are believed to be excited at the fundamental and second harmonic of the electron plasma frequency, by the electron beam excited Langmuir waves [...]... Read more »

G. Thejappa and R. J. MacDowall. (2015) Solar Type III Radio Bursts: Directivity Characteristics . Journal of Physics: Conference Series. info:/

  • November 1, 2016
  • 09:01 AM
  • 335 views

Multiwavelength study of 20 jets that emanate from the periphery of active regions by Sargam M. Mulay et al.*

by CESRA in Solar Radio Science

Solar jets are transient phenomena observed in the solar atmosphere. They appear as sharp-edged, impulsive, and collimated flows of plasma that move outwards with a bright spot at the footpoint, which forms an ‘inverted-Y’ topology of magnetic field lines. They are observed throughout the atmosphere i.e. in the photosphere (Hα, Ca II K [...]... Read more »

Mulay et al. (2006) Multiwavelength study of 20 jets that emanate from the periphery of active regions. Astronomy . info:/

  • October 18, 2016
  • 09:02 AM
  • 382 views

Decameter type III bursts with changing frequency drift-rate signs by V. Melnik et al.*

by CESRA in Solar Radio Science

We discuss properties of type III bursts that change the sign of their drift rate from negative to positive and vice versa. Moreover, these bursts may change the sign of their drift rates more than once. These particular type III bursts were observed simultaneously by the radio telescopes UTR-2, URAN-2, [...]... Read more »

V. Melnik et al. (2015) Decameter type III bursts with changing frequency drift-rate signs . Solar Physics. info:/

  • October 14, 2016
  • 06:20 AM
  • 346 views

Forgetting Earth, forgetting Mars: Dementia, pollution, and space travel

by gdw in FictionalFieldwork

Forgetting Earth Dementia. Few words inspire greater fear in those of us who value (quasi-?) independent thought. The term ‘dementia’ encompasses various brain disorders that all share some scary traits: general decline in cognitive function, decreased ability to speak, and in later stages, being unable to take care of oneself. Unfortunately, as human lifespan increases […]... Read more »

Killin LO, Starr JM, Shiue IJ, & Russ TC. (2016) Environmental risk factors for dementia: a systematic review. BMC geriatrics, 16(1), 175. PMID: 27729011  

Parihar VK, Allen BD, Caressi C, Kwok S, Chu E, Tran KK, Chmielewski NN, Giedzinski E, Acharya MM, Britten RA.... (2016) Cosmic radiation exposure and persistent cognitive dysfunction. Scientific reports, 34774. PMID: 27721383  

  • October 4, 2016
  • 09:05 AM
  • 394 views

Propagation of Coronal Mass Ejections: Aerodynamic Drag by Nishtha Sachdeva and Prasad Subramanian

by CESRA in Solar Radio Science

Coronal Mass Ejections (CMEs) are hot, massive blobs of plasma and magnetic fields that erupt from the Sun, and are sometimes Earth-directed. Depending on their speed and mass these transients can strongly effect the space weather, causing geomagnetic storms and damage to space bound technologies. It is therefore imperative to [...]... Read more »

Sachdeva, N., Subramanian, P., Colaninno, R., et al.,. (2015) Propagation of Coronal Mass Ejections: Aerodynamic Drag. Astrophysical Journal, 158. info:/

  • October 3, 2016
  • 12:08 PM
  • 414 views

The 7 Most Interesting Extrasolar Systems.

by Jeffrey Daniels in United Academics

Beyond the well-known Solar System, there is an immensity of other unique systems... Read more »

Johanna K. Teske, Stephen A. Shectman, Steve S. Vogt, Matías Díaz, R. Paul Butler, Jeffrey D. Crane, Ian B. Thompson, & Pamela Arriagada. (2016) The Magellan PFS Planet Search Program: Radial Velocity and Stellar Abundance Analyses of the 360 AU, Metal-Poor Binary "Twins" HD 133131A . Astronomical Journal,. arXiv: 1608.06216v2

Orosz, J., Welsh, W., Carter, J., Fabrycky, D., Cochran, W., Endl, M., Ford, E., Haghighipour, N., MacQueen, P., Mazeh, T.... (2012) Kepler-47: A Transiting Circumbinary Multiplanet System. Science, 337(6101), 1511-1514. DOI: 10.1126/science.1228380  

R. Di Stefano, & A. Ray. (2016) Globular Clusters as Cradles of Life and Advanced Civilizations. ASTROPHYSICAL JOURNAL , 827(1). arXiv: 1601.03455v1

Marcelo Tucci Maia, Jorge Melendez, & Ivan Ramirez. (2014) High precision abundances in the 16 Cyg binary system: a signature of the rocky core in the giant planet. ASTROPHYSICAL JOURNAL LETTERS , 790(2). arXiv: 1407.4132v1

Anglada-Escudé, G., Amado, P., Barnes, J., Berdiñas, Z., Butler, R., Coleman, G., de la Cueva, I., Dreizler, S., Endl, M., Giesers, B.... (2016) A terrestrial planet candidate in a temperate orbit around Proxima Centauri. Nature, 536(7617), 437-440. DOI: 10.1038/nature19106  

Borucki, W., Agol, E., Fressin, F., Kaltenegger, L., Rowe, J., Isaacson, H., Fischer, D., Batalha, N., Lissauer, J., Marcy, G.... (2013) Kepler-62: A Five-Planet System with Planets of 1.4 and 1.6 Earth Radii in the Habitable Zone. Science, 340(6132), 587-590. DOI: 10.1126/science.1234702  

Stephen R. Kane, & Dawn M. Gelino. (2014) On the Inclination and Habitability of the HD 10180 System. ASTROPHYSICAL JOURNAL, 792(2). arXiv: 1408.4150v1

  • September 27, 2016
  • 09:01 AM
  • 203 views

Diagnostics of the acceleration modulation process based on quasi-periodic variations of flare emission by Kupriyanova et al.*

by CESRA in Solar Radio Science

Quasi-periodic pulsations (QPPs) with the characteristic time scales from a few seconds up to tens of minutes are frequently seen in the time profiles of solar and stellar flare emission (Nakariakov et al., 2016 ). Among all the possibilities of QPPs explanation, two reasons are discussed more actively: magnetohydrodynamic (MHD) [...]... Read more »

Kupriyanova et al. (2016) Diagnostics of the acceleration modulation process based on quasi-periodic variations of flare emission. Solar Physics. info:/

  • September 13, 2016
  • 09:02 AM
  • 356 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:/

  • September 6, 2016
  • 01:00 PM
  • 304 views

High resolution observations of radio noise storms in the solar corona

by Prasad Subramanian and Claude Mercier in Solar Radio Science

The solar corona is a well known site for particle acceleration – examples range from spectacular large flares to the hard-to-observe nanoflares that are now a leading candidate for coronal heating.... Read more »

Prasad Subramanian and Claude Mercier. (2016) High resolution observations of radio noise storms in the solar corona . Astronomy . info:/

  • September 3, 2016
  • 03:04 PM
  • 451 views

The Genesis Project: New life on exoplanets

by Dr. Jekyll in Lunatic Laboratories

Can life be brought to celestial bodies outside our solar system, which are not permanently inhabitable? A new essay that has been published is trying to deal with this question. Over the last several years, the search for exoplanets has shown that very different types exist leading to new questions and a variety of possible answers.

... Read more »

Claudius Gros. (2016) Developing Ecospheres on Transiently Habitable Planets: The Genesis Project. Astrophysics and Space Science. arXiv: 1608.06087v2

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