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1

Electronic Resource

Modeling of occurrence frequencies of ion conics as a function of altitude and conic angle (1999)

Miyake, W. ; Mukai, T. ; Kaya, N.

Springer

Annales geophysicae 18 (1999), S. 47-55

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ISSN: 0992-7689

Keywords: Ionosphere (particle acceleration) ; Magnetospheric physics (auroral phenomena; magnetopause, cusp, and boundary layers)

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract The occurrence frequencies of dayside ion conics with various conic angles are obtained as a function of altitude from Exos-D (Akebono) observations. We made a model calculation of ion conic evolution to match the observation results. The observed occurrence frequencies of ion conics with 80° to 90° conic angle are used as an input to the model and the occurrence frequencies of ion conics with smaller conic angles are numerically calculated at higher altitudes. The calculated occurrence frequencies are compared with the observed ones of ion conics with smaller conic angles. We take into account conic angle variation with altitude in both adiabatic and non-adiabatic cases, horizontal extension of ion conics due to E × B drift, and evolution to elevated conics and ion beams in the model. In the adiabatic case, the conic angle decreases with increasing altitude much faster than was observed. The occurrence frequency of small-angle conics is much larger than the observed value without E × B drift and evolution to the other UFIs. An agreement is obtained by assuming non-adiabatic variation of conic angles with altitude and an ion E × B drift to gyro velocity ratio of 0.08 to 0.6, depending on geomagnetic activities.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s00585-000-0047-5

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2

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A statistical study of field-aligned electron beams associated with ion conies events (1998)

Miyake, W. ; Mukai, T. ; Kaya, N.

Springer

Annales geophysicae 16 (1998), S. 940-947

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ISSN: 0992-7689

Keywords: Ionosphere-magnetosphere interactions ; Particle acceleration ; Auroral phenomena

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract A statistical study of field-aligned electron beams associated with upflowing ion conics is presented from Exos-D (Akebono) observations below 10 000 km. The electron beams are narrowly collimated along the field line and generally have energies of several tens of eV. They are divided in the analysis into three types: upflowing, downflowing, and counterstreaming. All the types of electron beams are almost equivalent in their energy and pitch angle characteristics and their association rate with upflowing ion events. About 50% of ion conies are found to be coincident with field-aligned electron beams. There is also a correlation in energy between the field-aligned electrons and ion conics. These show that the association is not a mere coincidence but rather that the field-aligned acceleration of electrons is related to the perpendicular energization of ions. The association rate of upflowing electrons is high on the nightside, while that of downflowing electrons is high on the dayside. The association rate of downflowing electrons is high at low altitudes, and the rates of the three types of electron beams become equivalent at high altitudes. Data indicate that the height of the electron acceleration region is lower on the nightside. It is suggested that the average height of the electron acceleration region is around the satellite apogee (–10000 km), and the average thickness of the region is about thousands km.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s00585-998-0940-x

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3

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Potential Interference of Copper in Estimations Using Ngo-Lenhoff System

Baker, W.L. ; Karkaloutsos, J. ; Kaya, N.

Amsterdam : Elsevier

Analytical Biochemistry 219 (1994), S. 386-388

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ISSN: 0003-2697

Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Topics: Biology , Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1006/abio.1994.1286

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4

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EXOS-C (OHZORA) observations of polar cap precipitations and inverted V events

Mukai, T. ; Kaya, N. ; Obara, T. ; [et al.]

Amsterdam : Elsevier

Advances in Space Research 8 (1988), S. 363-372

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ISSN: 0273-1177

Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Type of Medium: Electronic Resource

URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(88)90151-2

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5

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Plasma wave excitation by intense microwave transmission from a space vehicle

Kimura, I. ; Matsumoto, H. ; Kaya, N. ; [et al.]

Amsterdam : Elsevier

Advances in Space Research 8 (1988), S. 291-294

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ISSN: 0273-1177

Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Type of Medium: Electronic Resource

URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(88)90374-2

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6

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An Integrated Genetic Linkage Map of the Soybean Genome (1999)

Cregan, P. B. ; Jarvik, T. ; Bush, A. L. ; [et al.]

Springer

Crop science 39 (1999), S. 1464-1490

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ISSN: 1435-0653

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Glycine max (L.) Merr.] have been developed over the past 10 yr. These maps are primarily based on restriction fragment length polymorphism (RFLP) markers. Parental surveys have shown that most RFLP loci have only two known alleles. However, because the soybean is an ancient polyploid, RFLP probes typically hybridize and map to more than one position in the genome. Thus, the polymorphic potential of an RFLP probe is primarily a function of the frequency of the two alleles at each locus the probe detects. In contrast, simple sequence repeat (SSR) markers are single locus markers with multiple alleles. The polymorphic potential of an SSR marker is dependent on the number of alleles and their frequencies. Single locus markers provide an unambiguous means of defining linkage group homology across mapping populations. The objective of the work reported here was to develop and map a large set of SSR markers. A total of 606 SSR loci were mapped in one or more of three populations: the USDA/Iowa State G. max × G. soja F2 population, the Univ. of Utah Minsoy × Noir 1 recombinant inbred population, and the Univ. of Nebraska Clark × Harosoy F2 population. Each SSR mapped to a single locus in the genome, with a map order that was essentially identical in all three populations. Many SSR loci were segregating in two or all three populations. Thus, it was relatively simple to align the 20+ linkage groups derived from each of the three populations into a consensus set of 20 homologous linkage groups presumed to correspond to the 20 pairs of soybean chromosomes. On the basis of in situ segregation or linkage reports in the literature all but one of the classical linkage groups can now be assigned to a corresponding molecular linkage group.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/

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The Variation of Geomagnetic Field Intensity in Central Anatolia During the Neogene-Quaternary Period (2023)

Kaya, N. ; Hisarlı, Z. ; Nowaczyk, N. ; [et al.]

In: Geophysical Journal International

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Publication Date: 2023-02-20

Description: A detailed palaeointensity study was performed using the modified Thellier method on eighteen Quaternary and Neogene volcanic units, ages ranging from 0.08 to 5.98 Ma, in Central Anatolia, Turkey. Robust data, which were estimated from twelve lava units in the study area, significantly increase the database of palaeomagnetic data, directions, and absolute palaeointensity for the Anatolian region covering the time window back to ∼6 Ma. Previous studies sensitively dated the samples, except for one site dated in this study. The palaeointensity (VDM) value from the upper Miocene site estimated as 48.6 ± 9.2 μT (10.1×1022 ± 1.9 Am2) fits well into the Neogene VDM range in the data archives. For Pliocene samples with an age of 4.7 Ma, the palaeointensity was calculated to be 21.0 ± 4.7 μT. For these samples, an inclination of +42.9° was determined, and together with the results of low palaeointensity and normal polarity, this corresponds to the Nunivak or Sidufjall subchrons. These are normal polarity chrons within the Gilbert Chron which predominantly has reversed polarity. Palaeodirectional data and field strength with age between 0.08-2.57 Ma clearly showed the Brunhes and Matuyama Chrons in the Pleistocene. Three new data with 25.0 ± 7.9 μT (age 1.84 Ma), 59.7 ± 8.2 μT (age 2.15 Ma), and 79.6 ± 19.3 μT (age 2.57 Ma) from the early Pleistocene period significantly contribute to global data archives, which lack palaeointensity data from similar latitude range. The average palaeointensity (VDM) values for nine Pleistocene sites were calculated to be 51.5 ± 16.4 μT (10.3×1022 ± 3.7 Am2). According to the comparison of our data with the palaeointensity database, field model record, and previous studies of the Pleistocene, significantly high field strength obtained from Central Anatolia, located in the northern hemisphere, could have occurred due to asymmetry between the northern and southern hemispheres during the Pleistocene.

Type: info:eu-repo/semantics/article

Format: application/pdf

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Aeolian imprints of multiple Mediterranean invasions of the Black Sea during Pleistocene (2022)

Erginal, A. ; Kıyak, N. ; Makaroğlu, Ö. ; [et al.]

In: Palaeogeography Palaeoclimatology Palaeoecology

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Publication Date: 2023-02-01

Description: Climate changes determined the repeated connections between the Black Sea, Caspian Sea and Mediterranean Sea. The landlocked anoxic Black Sea basin was exposed to several transgressions throughout Quaternary by the Mediterranean Sea through the Straits of Istanbul (Bosphorus) and by the Caspian Sea through the Manych-Kerch spillway. Sedimentological records of these connections are limited mostly to the marine terrace deposits of Marine Isotope Stage (MIS) 5e while the pre-MIS 5e period remains uncertain due to a lack of robust facies and chronological data from deep-sea sedimentary sequences. Here we discuss the imprints of multiple Mediterranean transgressions during Middle Pleistocene in the Black Sea based on facies analysis and the optical age of coastal carbonate aeolianites. Contrary to today's hydro-climate of the Black Sea, the aeolianites bear witness to the transformation of the Black Sea into a warm inland sea during successive Mediterranean invasions. Prior to the onset of aeolian deposition, paleosols were formed on the Eocene-aged hardened sandy silts, suggesting strongly washed soil. This is evidenced by no calcium carbonate and a high Rb/Sr ratio, with quartz amounting to of 99.8%. According to our OSL ages, carbonates deposited on the shelf plain under higher temperature and increased evaporation conditions in MIS 15 and the later interglacial phases were transported to the coastal sand dunes during the transitional phases of MIS 15–14, MIS 13–12, MIS 11–10 and MIS 9–8. We suggest that the carbonate-rich and ooid-containing aeolianites were repeatedly formed in the multiple Mediterranean transgression stages, beginning with an increasingly severe dry phase following the Brunhes-Matuyama magnetic reversal.

Type: info:eu-repo/semantics/article

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