Spelling suggestions: "subject:"solar flares"" "subject:"polar flares""
1 |
Enhanced black body radiation as a generating mechanism for white light solar flares / White light solar flaresNajita, Kazutoshi January 1969 (has links)
Typescript. / Bibliography: leaves [144]-149. / xi, 149 l illus
|
2 |
Five minute brightness fluctuations in the solar atmosphereBrailey, Allen Charles, 1948- January 1974 (has links)
No description available.
|
3 |
Ionospheric signatures of solar flares.Koen, Etienne Johannes. January 2009 (has links)
VLF waves propagate in the Earth-ionosphere waveguide (EIW). The EIW is bounded
below by the surface of the Earth and above by the ionospheric D-region (50–90 km
altitude). The conditions for wave propagation in the EIW are studied and derived
specifically for VLF propagation. The D-region is maintained by shortwave solar
radiation that ionises the neutral atmosphere. The Wait parameters, H′ (reflection
height) and (sharpness), describe the lower boundary of the D-region. Any
enhancement in solar X-rays modifies these parameters, leading to a change in the
propagation conditions for VLF signals. The effect of the terminator is presented where,
it is found to narrow the depression of the monthly averaged diurnal amplitude profile
from summer to winter. A series of solar flares were identified of which two case studies
are presented. H′ and are calculated from the VLF signals by the Long Wave
Propagation Code (LWPC). It is found that H′ decreased and increased at the time of
flare. Once H′ and are obtained, the electron density profile can be constructed which
is of crucial importance for VLF waves propagating in the EIW. The gradient of the
electron density profile is found to increase as increases. It’s found that all the modal
interference minima are moved towards the transmitter at the time of the flare. For
flares of great magnitude, extrapolation is required to classify the flare in a magnitude
class using VLF data. The change in the phase of the VLF signal is found to be linearly
proportional to the change in the X-ray flux. / Thesis (M.Sc.)-University of KwaZulu-Natal, Westville, 2009.
|
4 |
Numerical simulations of radiation and heating from non-thermal electrons in solar flaresPollock, Jennifer A. January 2008 (has links)
Thesis (Ph.D.) - University of Glasgow, 2008. / Ph.D. thesis submitted to the Department of Physics and Astronomy, Faculty of Physical Sciences, University of Glasgow, 2008. Includes bibliographical references.
|
5 |
Aspects of the relationship between active regions and Coronal Mass EjectionsGreen, Lucinda May January 2002 (has links)
No description available.
|
6 |
Photoelectric solar limb scans for determining mean chromospheric structure /Barnhart, Philip Everett January 1974 (has links)
No description available.
|
7 |
The evolution of solar active regions /Moses, Ray N. January 1973 (has links)
No description available.
|
8 |
Studies of soft x-ray emission during solar flaresAnandaram, Mandayam Nayaka 27 June 2016 (has links)
Solar flare soft x-ray emission from 0.5 Å to 8.5 Å was observed during 1967-68 by U.S. Naval Research Laboratory Bragg crystal (LiF and EDDT) spectrometers aboard the OS0-4 satellite and also by NRL broad band ionization detectors aboard the OG0-4 satellite. In this work, instrumental parameters for the LiF crystal spectrometer based on experimental values have been determined and used in the data analysis. The source continuum spectra between 1 Å and 3.8 Å have been obtained for selected flares from OS0-4 spectrometer scans. As these spectra are each affected by time variations over 14 minutes, they are compared with the thermal continuum (free-free and free-bound) spectra predicted in the following manner. The instantaneous electron kinetic temperature and emission measure (equal to the product of the square of the electron number density and the total volume) of the flare plasma are determined from the available OG0-4 broad band data. The expected continuum flux is calculated by using these parameters. The comparison shows that there is good agreement between 2 Å and 3.8 Å. Thus it has been concluded that reliable values of the average electron temperature can be determined from the OG0-4 flare data. The earlier wavelength assigrunent and line identification list published by Meekins et al (1970, Solar Physics 13, 198) has been substantially improved in this work by separately summing a large number of OS0-4 spectrometer scans of the flaring and active sun. All identified wavelengths are found to agree with the more accurate theoretical valuesto within + 0.01 Å. Identifications of several weak lines as due to hydrogen-like and helium-like ions of chlorine and phosphorus have also been suggested. The temporal behaviour of selected ion line intensities (due to Fe, Ca, Si, S, Al, and Mg) indicates that they follow the expected temperature variations during the flare. The total continuum emission in the 0.5 to 3 Å and the 1 to 8 Å broad band segments has been determined from OG0-4 data for 21 flares. In doing this, a simple and approximate method of converting the total emission based on the gray body approximation (in which the OG0-4 data are reported) to one based on the thermal continuum spectrum has been developed. This study shows that the total energy lost in the 0.5 to 8 Å soft x-ray channel is of the order of 10²⁸ to 10³⁰ ergs depending on the Hα importance of the flare (from sub- to class 2); it is also shown that this energy is comparable with that emitted in higher wave length segments estimated by other authors. / Graduate
|
9 |
Observations and analysis of solar flares using Hd spectral profiles /Gunkler, Todd Alan, January 1984 (has links)
Thesis (Ph. D.)--University of California, San Diego, 1984. / Vita. Includes bibliographical references (leaves 141-142).
|
10 |
Observations and analysis of solar flares using Hd spectral profilesGunkler, Todd Alan, January 1984 (has links)
Thesis (Ph. D.)--University of California, San Diego, 1984. / Vita. Includes bibliographical references (leaves 141-142).
|
Page generated in 0.0581 seconds