SciVerse Home ScienceDirect® Home * Hub * ScienceDirect * Scopus * Applications * Register * Login * Go to SciVal Suite Username: Password: Remember me | Not Registered? Forgotten your username or password? Go to Athens / Institution login You have guest access to ScienceDirect. Find out more. * Home * Browse * Search * My settings * My alerts * Help All fields Author Advanced search Journal/Book title Volume Issue Page Search tips Advertisement Font Size: Decrease Font Size Increase Font Size Related Articles Kelvin-Helmholtz instabilities in cometary ion tails /Planetary and Space Science/ Close You are not entitled to access the full text of this document *Kelvin-Helmholtz instabilities in cometary ion tails Original Research Article* /Planetary and Space Science/, /Volume 30, Issue 3/, /March 1982/, /Pages 245-250/ T. Ray *Abstract* We interpret observations of wave-like phenomena in cometary ion tails in terms of the interaction of the tails with the solar wind through Kelvin-Helmholtz helical instabilities. The calculations are applied to three comets, Comet Kohoutek (1973f), Comet Arend Roland (1957 III) and Comet Morehouse (1908c). Whilst some disagreement is found with earlier work, it is nevertheless shown that, assuming typical parameters, the growth rate of the K-H helical mode should be significant for wavelengths approximately equal to the tail radius. Purchase PDF (573 K) Structures far from the head of comet Kohoutek : II. A ... /Icarus/ Close You are not entitled to access the full text of this document *Structures far from the head of comet Kohoutek : II. A discussion of the swan cloud of January 11 and of the general morphology of cometary plasma tails Original Research Article* /Icarus/, /Volume 42, Issue 2/, /May 1980/, /Pages 257-270/ Malcolm B. Niedner Jr., John C. Brandt *Abstract* Photographs taken in New Mexico and in Japan during 1974 January 9–11 show that the “Swan Cloud” observed in comet Kohoutek on January 11 ([Hyder et al., 1974], Icarus23, 601–610: Paper I) was an advanced stage of a plasma tail disconnection event (DE). The event commenced and evolved with the development of strong tail ray activity, the actual tail disconnection, the merging of the disconnected tail with the new tail to form the Swan, and a new feature not discussed in recent disconnection models—the formation of arcade loops in the space between closing tail rays. An unusual aspect of the event was the deceleration of the rejected tail as it receded from the head. The observed morphological sequence is easily understood in the sector boundary model ([Niedner and Brandt, 1978], Astrophys. J.223, 655–670; 1979, Astrophys. J.234 723–732), in which dayside reconnection of captured interplanetary fields at sector boundary crossings strips away the existing tail, and field capture in the new sector builds a new tail. The associated sector boundary for the event passed Earth of 1974 January 14. The arcade loops are proposed to be reconnected flux tubes between oppositely polarized tail rays in the incipient new tail which followed the disconnection. This interpretation is not only consistent with the magnetic field topology advocated in Alfvén's original model (H. Alfvén, 1957 Tellus9 92–96), but it may also provide a physical model for some of the features known historically as “condensation,” at least some of which appear to have formed in the same manner. Purchase PDF (8578 K) Solar wind interaction with the tail of Comet Kohoutek /Planetary and Space Science/ Close You are not entitled to access the full text of this document *Solar wind interaction with the tail of Comet Kohoutek Original Research Article* /Planetary and Space Science/, /Volume 24, Issue 3/, /March 1976/, /Pages 287-291/ A.I. Ershkovich *Abstract* Helical waves of large amplitude observed recently in the tail of Comet Kohoutek are interpreted as stable waves arising due to non-linear evolution of Kelvin-Helmholtz instability. The dispersion equation for waves of a finite amplitude shows that the phase velocity of these waves should approximately coincide with the velocity of the plasma outflow in the tail rather than with the Alfvén velocity. This fact is shown to be in agreement with observations. One may estimate the magnetic field in the Comet Kohoutek tail from both the amplitude of observed helical waves and the pressure balance at the tail boundary. The field turns out to be of the order of the interplanetary magnetic field or less, i.e. less, approximate25 γ near not, vert, similar0.5 AU. Purchase PDF (519 K) The cometary magnetic field and its associated electric... /Icarus/ Close You are not entitled to access the full text of this document *The cometary magnetic field and its associated electric currents Original Research Article* /Icarus/, /Volume 26, Issue 4/, /December 1975/, /Pages 457-461/ W-H. Ip, D. A. Mendis *Abstract* Two different observations of Comet Kohoutek (1973f) seem to suggest the existence of substantial magnetic fields (greater-than or equivalent to 100 γ) in its coma and tail. The effects of the currents and hydromagnetic waves associated with these magnetic fields are considered and it is shown that while the currents closing through the inner coma may represent an important source of ionization in that region, the dissipation of hydromagnetic waves may also be a significant, if not dominant, source of heating there. Purchase PDF (456 K) Plasma dynamics in the tail of Comet Kohoutek 1973 XII /Icarus/ Close You are not entitled to access the full text of this document *Plasma dynamics in the tail of Comet Kohoutek 1973 XII Original Research Article* /Icarus/, /Volume 47, Issue 3/, /September 1981/, /Pages 397-411/ Klaus Jockers *Abstract* Photographs of Comet Kohoutek 1973 XII from the period 1974, Jan. 19, 0 UT to Jan. 21, 3 UT, collected from many different observatories and assembled in a unified format, are studied. During this time a large-scale tail disturbance was observed which coincides with the passage of a high-speed solar wind stream and an interplanetary sector boundary. Superimposed on a regular outward motion of tail condensations of a speed less than or about 100 km/sec, a kink moves down the tail with almost solar wind velocity. From the shape of the kink the direction of the solar wind adjacent to the tail is deduced. Of particular interest are tail segments where the solar wind flows across the tail. A waviness on the windward side of the tail is explained by differential acceleration, i.e., dense tail clouds are more massive and therefore less accelerated by the solar wind. On the leeward side tail rays point into the down-wind direction. During the large-scale disturbance the overall plasma density seems to be enhanced. While a tail disconnection does not occur in the event studied it is proposed that the tail disconnection observed in other, more dramatic events is caused by the differential acceleration mechanism combined with changes in the ion source. These are possibly due to enhanced charge exchange of cometary neutrals in the compression region in front of the high speed stream. The problem of tail ray formation near tail condensations is discussed but no solution is offered. Purchase PDF (4461 K) View more related articles Related reference work articles e.g. encyclopedias Solar System, Magnetic and Electric Fields /Encyclopedia of Physical Science and Technology/ Close You are not entitled to access the full text of this document *Solar System, Magnetic and Electric Fields * /Encyclopedia of Physical Science and Technology/, /2004/, /Pages 189-209/ C. T. Russell Click here for a PDF excerpt Purchase PDF (1222 K) Primitive Solar System Objects: Asteroids and Comets /Encyclopedia of Physical Science and Technology/ Close You are not entitled to access the full text of this document *Primitive Solar System Objects: Asteroids and Comets * /Encyclopedia of Physical Science and Technology/, /2004/, /Pages 73-85/ Lucy-Ann McFadden, Daniel T. Britt Click here for a PDF excerpt Purchase PDF (3233 K) Cometary Physics /Encyclopedia of Physical Science and Technology/ Close You are not entitled to access the full text of this document *Cometary Physics * /Encyclopedia of Physical Science and Technology/, /2004/, /Pages 339-374/ W. -H. Ip Click here for a PDF excerpt Purchase PDF (9914 K) Instrumentation for Planetary Exploration Missions /Treatise on Geophysics/ Close You are not entitled to access the full text of this document *Instrumentation for Planetary Exploration Missions * /Treatise on Geophysics/, /2007/, Chapter 10.18, /Pages 595-641/ P. Falkner, A. Peacock, R. Schulz *Abstract* This chapter outlines the exploration strategies and associated techniques for the solar system in both the short and longer terms. Current spaceborne instrumentation based on various measurement principles is explained, ranging from imagers, spectrometers, altimeters to particle and plasma instruments for both, remote-sensing and in situ investigations. The benefits of instrument combinations and integration into instrument suites are discussed and examples of potential exploration suites are given for the investigation of planetary shape, size and mass, their surface and subsurface properties, moons and rings and the analyzing of planetary atmospheres, exospheres, ionospheres, and magnetospheres. Dedicated instrumentation suites for asteroids and comets are also outlined, as well as for the wide field of exobiology. A sample return approach is discussed. A summary of engineering and operational constraints is given, to illustrate the difficulty of final instrument selection for a particular mission. The chapter is concluded with an outlook. Purchase PDF (842 K) Cosmochemical Applications Using Mass Spectrometry /Encyclopedia of Spectroscopy and Spectrometry/ Close You are not entitled to access the full text of this document *Cosmochemical Applications Using Mass Spectrometry * /Encyclopedia of Spectroscopy and Spectrometry/, /2009/, /Pages 414-421/ J.R. De Laeter *Abstract* The use of mass spectrometry to study samples from extra-terrestrial origin is described. Such earth-bound material can arise from meteorites or materials recovered from the moon. In addition, mass spectrometers have been carried on various space probes to investigate the material in Halley’s comet, the solar wind, interplanetary dust particles and the Martian atmosphere. Investigations include not only compositional studies but isotopic anomalies and time scales of cosmological events as well. Purchase PDF (313 K) More related reference work articles Advertisement PANGAEA Supplementary Data View Record in Scopus * Purchase PDF (8307 K) * Export citation Abstract Abstract - selected References References - selected Return your view to full page Focus your view on this article *Icarus* Volume 23, Issue 4 , December 1974, Pages 601-610 ------------------------------------------------------------------------ doi:10.1016/0019-1035(74)90028-1 | How to Cite or Link Using DOI Copyright © 1974 Published by Elsevier Science (USA). Cited By in Scopus (1) Permissions & Reprints Tail structure farr from the head of Comet Kohoutek. I Purchase the full-text article References and further reading may be available for this article. To view references and further reading you must purchase this article. *Charles L. Hyder^1 <#fn1>, John C.Brandt and Robert G. Roosen^1 <#fn1>* Laboratory for Solar Physics and Astrophysics, NASA-Goddard Space Flight Center, Greenbelt, Maryland 20771, USA Received 4 June 1974; revised 15 July 1974. Available online 26 October 2002. Abstract Two tail structures 0.1AU from the head of Comet Kohoutek were photographed during January 1974. One was a wavy structure resembling a helix while the other was an irregular Swan-like cloud. Both features were propagating down the tail at approximately 250km/sec, and the observed speed is probably the phase speed. We discuss the physical origin of these structures and interpret the helix as a kink instability resulting from currents flowing along the tail axis. Article Outline • References ^1 <#bfnfn1> NASA-GSFC-New Mexico Station, 800 Yale Boulevard, N.E., Albuquerque, New Mexico 87131. ------------------------------------------------------------------------ *Icarus* Volume 23, Issue 4 , December 1974, Pages 601-610 Sponsored Links Full-Text Online Journals Full-text journals for academic research at Questia Online Library. www.Questia.com/Journals What is Quantum Jumping? Discover Why Thousands of People are "Jumping" to Change Their Life www.QuantumJumping.com Top Telescopes On Sale 20-70% Off Celestron, Meade, Bushnell and More | Fast/Free S&H www.OpticsPlanet.net/Telescopes * Home * Browse * Search * My settings * My alerts * Help Elsevier homepage (opens in a new window) * *About ScienceDirect* * o What is ScienceDirect o Content details o Set up o How to use o Subscriptions o Developers * *Contact and Support* * o Contact and Support * *About Elsevier* * o About Elsevier o About SciVerse o About SciVal o Terms and Conditions o Privacy policy o Information for advertisers Copyright © 2011 Elsevier B.V. All rights reserved. SciVerse® is a registered trademark of Elsevier Properties S.A., used under license. ScienceDirect® is a registered trademark of Elsevier B.V.