... The Sun of our solar system is a typical star of intermediate size and luminosity. ... The Sun has a very complex surface magnetic field created by convective flow of the electrically conducting solar material. ... The escaping hot coronal plasma is called the solar wind . ... See the table below for the observed features above the Sun's surface. ... Chromospheric features . Coronal features . ... dense clouds of material suspended above the surface of the Sun by magnetic field line loops . ...

The figure below shows what stellar spectra are like in this wavelength range. All stars hotter than about 3000 K effective temperature radiate like a hot blackbody at these long wavelengths, possibly with a very few atomic lines (of Hydrogen, in the A-type stars) or molecular bands (the CO band overtone near 2.25 microns for example, in K-type stars and G-type stars). ... unusual features: mixed chemistry sources, Wolf-Rayet stars, ice bands, featureless carbon-star spectra ...

Next: C.S. Jeffery, Research Astronomer Up: Research Previous: J.E. Chambers, Research Astronomer Contents . ... We examine spectral time-series of two lower-chromospheric lines observed with SUMER/SOHO (N I and C II ). ... Two examples of explosive events observed with SUMER/SOHO in transition region spectral lines are reported here; one detected in C IV 1548?, in a region within the northern polar coronal hole, and the other in O VI 1032?, in an active region. ...

... Science . ... Science Users Information > Science Activities > APEX Science Verification > SHFI . ... Observing Facilities . ... Observing with ESO Telescopes . ... Telescope Time Allocation . ... ESO Data . ... The Science Verification (SV) observations of the APEX Swedish Heterodyne Facility Instrument were observed in March 2008. ... A selection of the APEX-1 proposals listed below have been observed during the week of joint SV observations in March 2008, and later during the ESO time of period...

... We will consider the rms, (K), for observations with a receiver of system temperature, T , frequency resolution, per polarization, and total integration time per observing cycle, . ... For ``in-band'' frequency switching, the line under investigation is always in the observing band. ... Position Switching or ``Out-of-Band'' Frequency Switching: Here the line is only observed for one half of the time, with noise being present all of the time. ...

... Fitting the observed dependence includes calculations of the polarization cross-sections averaged over particles orientation and size distribution, their normalization and the comparison of obtained dependencies with Serkowski's curve representing observational data for a chosen star. ... Variations of the polarization factors with wavelength are shown in Fig. 16 for homogeneous spheroidal particles with PF orientation. ... The distinction between prolate and oblate spheroids is also clearly seen. ...

... The Sun has come all of one day away from breaking its record for the longest period of inactivity for the last decade - reaching a mid-summer low and falling into yet another state of "hibernation". Yesterday, on the first day of autumn, new sunspots appeared on the surface of the Sun following an absence of almost 50 days. ... The first low lasted 51 days, from 21 July until 11 September last year. ... Now, almost a year later, it seems the Sun has hit a new low almost as "deep" as the first. ...

The CHIANTI database consists of 4 primary ASCII files for each ion in the database. contains the energy levels in cm^(-1) It includes both experimental data and theoretical values of the levels energies. References: %Observed energy levels (2): Feldman, U., Curdt, W., Landi, E., Wilhelm, K., 2000, ApJ, 544, 508 %Observed energy levels (3,4,5): Sandlin, G.D., Bruekner, G.E., Scherrer, V.E., Tousey, R., 1976, ApJ, 205, L47 %Observed energy levels (6 to 15): Fuhr, J.R., et al., ...

... Sun as a Source of Perturbation of Near-Earth Medium and Solar System Bodies. ... Tidal Influence of the Sun on the Earth. ... Structure of Solar Atmosphere. ... Observing Manifestations of Solar Activity. ... Forecasting of Solar Activity. ... Influence of Solar Activity on the Structure and Dynamics of Terrestrial Atmosphere. ... Problem of Mechanism of Solar-Troposphere Connections. ... Phenomenons in Auroral Zones of the Earth as a Result of the Sun Influence on the Terrestrial Atmosphere. ...

Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 17 - 23.02.2014, Forecast on 24.02 - 02.02.2014 , Carrington Rotation 2147 (11,73.02.2014) SUNSPOT-FORMING ACTIVITY REMINDER AT MEDIUM AND HIGH LEVELS, GRA- DUALLY INCREASING TOWARDS THE END OF PERIOD. ... NEXT WEEK IS EXPECTED THE HIGH AND THE MODERATE LEVELS OF SUNSPOT- FORMING ACTIVITY. ... FLARE ACTIVITY WAS AT THE MODERATE LEVEL 20 AND 23.02, AND THE LOW LEVEL IN OTHER DAYS. ... G - geoeffectivity in last solar rotation; A - active. ...

... Spacecraft . 29b. Satellites looking down . ... 29e. Explorers of distant space . ... The Hubble orbiting telescope. ... The Hubble telescope , in low Earth orbit, overcomes such limitations, in the visible range and in part of the UV. ... So fruitful was this observation that a second "deep field" exposure of such length, near the southern pole of the heavens, was recently conducted. ... Some satellites specialize in observing the Sun, such as the Japanese Yohkoh and NASA's SOHO . ...

Statistics of sunspot activity . The sunspot indices . ... Visual indices of solar activity . ... n - number of spot groups . A - Waldmeier class of unipolar spot groups without penumbra . B - class of bipolar spot groups without penumbra . C - class of bipolar spot groups with one penumbra pole . D - class of small bipolar spot groups with two penumbra poles . E - class of middle bipolar spot groups with two penumbra poles . ... H - class of unipolar penumbrated spot groups . ...

home education > activities . ... Astronomy . ... This calculational activity by Evan Manning helps familiarize students with the Gregorian calendar, and then asks them to come up with a calendar system for another planet where the year is also not an integer multiple of days. [m,h] . ... Offers a spreadsheet to make a scale model of the solar system and beyond. ... Very basic activity, building a scale model of the Earth-Moon system; also teaches the simple math of ratios and scaling. [e, m] . ...

Next: TESTD/CCD Up: Test Commands Previous: TESTF/CCD . ... Two linearity curves, expressed as count rate versus true exposure time. The mechanical shutter delay is determined either by linear extrapolation of the normal linearity curve (observed counts versus exposure time), thus assuming the response of the CCD is linear, or by adjusting the exposure times such that the count rate curve is closest to a straight line, thus allowing for a first-order nonlinearity in the response of the CCD. ...

... The schedule assigned id (example: AS05) for your observing program. ... Use the time you started using the telescope including when you started taking calibrations. The time you opened for on sky observations can be entered later in the activity log. UTC End Time: . ... Focus Log: . ... The focus position can be obtained under the Telescope column of the System Status in ACP or from the run log. ... When all fields are filled out press this button to email the log to the ARCSAT and community. ...

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Mopra radio telescope . ... Information & tools for observers . Applying for observing time . ... Observing schedules . ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... Try and find the Moon in the sky once a day over a month*. ... Lunar observations . ... Wildflowers Home . Activities . ...

Supercurrents through the superconductor­ferromagnet­superconductor (SFS) junctions Alexander V. Veretennikov a,1 , Valery V. Ryazanov a , Vladimir A. Oboznov a , Alexander Yu. ... The idea of a #­ contact was first proposed for the superconductor­ ferromagnet­superconductor (SFS) Josephson junctions [2], where exchange ferromagnetic field was responsible for spatial oscillations of the in­ duced superconducting order parameter in the F­layer. ... Ni film with thickness of 19 nm. ...

... Galaxies 99 Cosmic background with model of cloudy interstellar medium Yu. ... Figure 1: Averaged spectrum of the cosmic background I f in frequency range 0.25 200 MHz for the Galactic poles. ... First interpretation of the cosmic noise background spectrum at broad band frequency range 0.25 200 MHz with a model of the cloudy interstellar medium ISM is presented here. ... Synthesized background spectra I f for regions of the Galactic poles at the frequency range 0.25 200 MHz is presented in Fig. ...

... Basic Research results General information Main characteristics of the Radio telescope Observing programs General view of the antenna array Main research areas Principle of generation of radio images Radio telescope's beam Receiving systems Main characteristics of the base receiving-recording complex Calibrations Data archive and databases Publication of data Possibilities of observing the structure and dynamics of microwave activity SSRT - Research results . ...