Abstract
The plasma tails of comets clearly show the demarcation of the solar wind into distinct equatorial and polar regions (Brandt and Snow (2000), Icarus 148, 52–64). The boundary is determined by the maximum extent in latitude of the heliospheric current sheet (HCS). The observational record contains many well-observed equatorial comets, but observations of comets in the polar region are relatively rare.
In addition to its size and brightness, comet Hale-Bopp had an orbital inclination of 89.4° and was well observed for months in the polar region. We document the comet’s large-scale appearance throughout the apparition, including the polar region and its transition into the equatorial region. The bright dust tail hampered observations of the plasma tail, particularly near the head, but images taken with a CO+ filter show a very large disconnection event (DE) on May 7 and May 8, 1997. The time of disconnection is estimated at approximately May 4.0. This DE is associated with a crossing of the HCS. The model calculations of the HCS indicate that other crossings might have occurred in late April, but given the uncertainty in the calculation, the comet might have missed the HCS. Sparse observational coverage and the bright dust tail prevent further investigation of the potential earlier HCS crossings. The plasma tail shows anomalous orientations at the highest latitudes and possible explanations are discussed.
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References
Bagdonat, T. and Motschmann, U.: 2002, `From a Weak to a Strong Comet - 3D Global Hybrid Simulation Studies’, these proceedings.
Belton, M. J. S. and Brandt, J. C.: 1966, `Interplanetary Gas. XII. A Catalog of Comet-Tail Orientations’, ApJS 13, 125–332.
Biermann, L.: 1951, `Kometenschweife and Solar Korpuskularstrahlung’, Z. Astrophys. 29 279–286. Brandt, J. C. and Snow, M.: 2000, `Heliospheric Latitude Variations of Properties of Cometary Plasma Tails: A Test of the Ulyesses Comet Watch Paradigm’, Icarus 148 52–64.
Brandt, J. C., Caputo, F. M., Hoeksema, J. T., Niedner, Jr. M. B., Yi, Y., and Snow, M.: 1999, `Disconnection Events (DEs) in Halley’s Comet 1985–1986: The Correlation with Crossings of the Heliospheric Current Sheet (HCS)’, Icarus 137, 69–83.
Brandt, J. C., Roosen, R. G., and Harrington, R. S.: 1972, `Interplanetary Gas. XVII. An Astrometric Determination of Solar-Wind Velocities from Orientations of Ionic Comet Tails’, ApJ 177, 277284.
Brandt, J. C., Yi, Y., Petersen, C. C., and Snow, M.: 1997, `Comet de Vico (122P) and Latitude Variations of Plasma Phenomena’, Planet. Space Sci. 45, 813–819.
Cremonese, G. and Fulle, M.: 1989, `Photometrical Analysis of the Neck-Line Structure of Comet Halley’, Icarus 80, 267–279.
Delva, M., Schwingenshuh, K., Niedner, Jr. M. B., and Gringauz, K. I.: 1991, `Comet Halley Remote Plasma Tail Observations and In Situ Solar Wind Properties: VEGA-l/2 IMF Plasma Observations from 1 December 1995 to 1 May 1996’, Planet. Space Sci. 39 697–708.
Fischer, C. T., Haerendel, G., and Bogdanov, A. T.: 1997, `Dynamics of Structures in the Plasma Tail of Comet Hale-Bopp’, Earth Moon Planets 77, 279.
Fulle, M.: 1987, `A Possible Neck-Line Structure in the Dust Tail of Comet Halley’, Astron. Astrophys. 181, L 13-L 14.
Gombosi, T. I., DeZeeuw, D. L. Häberli, R. M., and Powell, K. G.: 1996, `Three-Dimensional Multiscale MHD Model of Cometary Plasma Environments’, J. Geophys. Res. 101 15,23315,253.
Gombosi, T. I., Hansen, K. C., DeZeeuw, D. L., Combi, M. R., and Powell, K. G.: 1997, `MHD Simulation of Comets: The Plasma Environment of Comet Hale-Bopp’, Earth Moon Planets 79, 179–207.
Hansen, K. C., Combi, M. R., Crary, F. J., De Zeeuw, D. L., Gombosi, T. I., and Young, D. T.: 2001, F. J., De Zeeuw, D. L., Gombosi, T. I., and Young, D. T.: 2001, `Global MHD Simulations of Comet Borrelly’s Plasma Environment: Effects of a Strong Neutral Jet’, BAAS 33, 1075.
Jockers, K., Credner, T., Karpov, N., and Sergeev, A.: 1996, `Comet C/1995 01 (Hale-Bopp)’, IAUC 6468.
Jones, G.: 1997, `The Interaction of C/1995 01 Hale-Bopp with the Solar Wind as Recorded in CoCam Images: A Progress Report’, Earth Moon Planets 77, 281.
Kimura, H. and Liu, C. P.: 1977, `On the Structure of Cometary Dust Tails’, Chinese Astr. 1, 235–264.
Kinoshita, D., Watanabe, J., Fukushima, H., Sekiguchi, T., Yamamoto, N., and Abe, S.: 1997, `Wide Field Imaging of Ion Tail of Comet C/Hale-Bopp’, Earth Moon Planets 77, 265–269.
McComas, D. J., Bame, S. J., Barraclough, B. L., Feldman, W. C., Funsten, H. 0., Gosling, J. T., Riley, P., Skoug, R., Balogh, A., Forsyth, R., Goldstein, B. E., and Neugebauer, M.: 1998, `Ulysses Return to the Slow Solar Wind’, Geophys. Res. Lett. 25, 1–4.
Niedner, Jr. M. B.: 1981, `Interplanetary Gas. XXVII. A Catalogue of Disconnection Events in Cometary Plasma Tails’, ApJS 46, 141–157.
Nordholt, J. E., Reisenfeld, D. B., Wiens, R. C., Crary, F., Delapp, D. M., Elphic, R. C., Funsten, H. 0., Gary, S. P., Hanley, J. J., Lawrence, D. J., McComas, D. J., Shappirio, M., Steinberg, J. T., Wang, J., and Young, D. T.: 2002, `Deep Space 1 Encounter with Comet l9PBorrelly: Ion Composition Measurements by the PEPE Mass Spectrometer’, Geophys. Res. Lett.,in press.
Pansecchi, L., Fulle, M., and Sedmak, G.: 1987, `The Nature of Two Anomalous Structures Observed in the Dust Tail of Comet Bennett 1970 III: A Possible Neck-Line Structure’, Astron. Astrophys. 176, 358–366.
Phillips, J. L., Bame, S. J., Goldstein, F. W. C., B. E., Gosling, J. T., Hammond, C. M., McComas, D. J., Neugebauer, M., Scime, E. E., and Suess, S. T.: 1995, `Ulysses Solar Wind Plasma Observations at High Southerly Latitudes’, Science 268, 1030–1033.
Rauer, H.: 1997, `Ion Composition and Solar Wind Interaction: Observations of Comet C/1995 01 (Hale-Bopp)’, Earth Moon Planets 79, 161–178.
Smith, E. J., Balogh, A., Forsyth, R. J., and McComas, D. J.: 2001, `Ulysses in the South Polar Cap at Solar Maximum: Heliospheric Magnetic Field’, Geophys. Res. Lett. 28, 4159–4162.
Suess, S. T. and Smith, E. J.: 1996, `Latitudinal Dependence of the Radial IMF Component: Coronal Imprint’, Geophys. Res. Lett. 23, 3267–3270.
Voelzke, M. R.: 2002, `Disconnection Events in Comets’, these proceedings.
Voelzke, M. R. and Matsuura, 0. T.: 1998, `Morphological Analysis of the Plasma Structures of Comet P/Halley’, Planet. Space Sci. 46, 835–841.
Wegmann, R.: 1995, `MHD Model Calculations for the Effects of Interplanetary Shocks on the Plasma Tail of a Comet’, A and A 294, 601–614.
Wegmann, R.: 2000, `The Effect of Some Solar Wind Disturbances on the Plasma Tail of a Comet: Models and Observations’, A and A 358, 759–775.
Yi, Y., Brandt, J. C., Randall, C. E., and Snow, M.: 1994, `The Disconnection Event of Comet Halley on 1986 March 16.0’, AJ 107, 1591–1596.
Yi, Y., Walker, R. J. Ogino, T., and Brandt, J. C.: 1996, `Global Magnetohydrodynamic Simulation of a Comet Crossing the Heliospheric Current Sheet’, J. Geophys. Res. 101 27,585–27,601.
Young, D. T., Crary, F. J., Nordholt, J. E., Hanley, J. J., Burch, J. L., McComas, D. J., Goldstein, R., Boice, D., Wiens, R. C., Lawrence, D. R., Eviatar, A., Sauer, K., and Meier, R.: 2001, F.J., Nordholt, J. E., Hanley, J. J., Burch, J. L., McComas, D. J., Goldstein, R., Boice, D., Wiens, R. C., Lawrence, D. R., Eviatar, A., Sauer, K., and Meier, R.: 2001, `Solar Wind Interaction with the Coma of Comet 19P/Borrelly’, BAAS 33, 1087.
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Brandt, J.C. et al. (2002). Large-Scale Structures in Comet Hale-Bopp. In: Boehnhardt, H., Combi, M., Kidger, M.R., Schulz, R. (eds) Cometary Science after Hale-Bopp. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1088-6_2
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DOI: https://doi.org/10.1007/978-94-017-1088-6_2
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