Solar activity often occurs near sunspots, dark regions on the sun caused by concentrated magnetic fields the solar irradiance measurement is much higher during solar maximum, when sunspot cycle and solar activity is high, versus solar minimum, when the sun is quiet and there are usually no sunspots. A new report issued by the national research council (nrc), the effects of solar variability on earth's climate, lays out some of the surprisingly complex ways that solar activity can make itself felt on our planet. Earth planets space, 52, 121-132, 2000 long term variability in solar wind velocity and imf intensity and the relationship between solar wind parameters & geomagnetic activity.
The solar activity can be expressed through many indices eg the sunspot numbers (ssn), 107-cm solar flux and various other solar indices covering practically the whole range of electromagnetic spectrum  the cosmic ray flux is also used to express the variational characteristics of solar activity. The aim of this work is to study the possible role of some solar variability parameters such as the geomagnetic activity, aa , the sunspot number, rz , and the dynamic pressure, nv 2 , through a period of 39 years, (468 months from.
Abstract: this paper presents an analysis of the f-region variability of the ionospheric parameters [fof2and m(3000)f2] at three low latitude stations during low solar activity periods from january 2006 to december 2010. Researchers recorded the effects of geomagnetic and solar activity by monitoring study participants' heart rate variability (hrv) - the beat-to-beat changes in their heart rates the participants comprised 16 healthy females ranging in age from 24 to 49 who worked at the prince sultan cardiac center in hofuf, saudi arabia, where the study. 211 variation of the solar structuresmany different indicators have been employed as measures of solar activity the basic indicator and also the most commonly used parameter in many correlation studies for sun-weather relationships is the number of sunspots visible on the solar disk at any given time.
The upper atmospheric parameters variation have been studied under the effect of solar activity at altitude of low artificial satellites 500km the atmospheric parameters have been determined for three days. Understanding the role of variability in solar activity is essen- surements of both solar and climate parameters, evidence of a solar signal in the climate of the. Published: mon, 12 mar 2018 chapter 7: overall conclusion and future prospect of research in the present work, efforts have been given to get an idea of variability of solar activity parameters during the recent solar minimum period and also to understand the effect of the solar activity parameters at the f 2 region of the ionosphere. Variability of rainfall and temperature (1912-2008) parameters measured from santa maria (29°41's, 53°48'w) and their connections with enso and solar activity. Extensive observations of the solar wind spanning several solar cycles allow the use of statistical methods to quantify the evolution of solar wind variability with solar cycle phase and between different cycles (dmitriev et al, 2009 veselovsky et al, 2010.
From the statistical relation of several other solar wind/imf parameters, their variability and combinations with ap, one sees linear relation for solar wind electric field, n/s component of imf and variability in the components of b an estimate is made of the base level of the magnetosphere, corresponding to quiet levels of geomagnetic activity. The ionospheric parameters (electron and ion plasma temperatures (te and ti) and total ion density, ni) as obtained by the indian sross-c2 satellite (altitude ∼500 km) have been investigated during low (year 1995, f 107 ∼ 77 sfu) and high (year 2000, f 107 ∼ 177 sfu) solar activity periods. The term the solar-stellar connection has been coined to describe the solar-stellar synergisms in the investigation of the generation, emergence and coupling of magnetic fields with the outer solar-stellar atmosphere to produce what we broadly refer to as magnetic activity.
Any solar model constructed to try and model the solar activity cycle must explain all these changes- the changes in the global parameters ie, irradiance, temperature, and radius, as well as changes in the oscillation. Parameters of solar activity and the interplanetary medium between 1965 and 2015 are studied by means of spectral analysis the data are analyzed separately accord ing to cycles of solar activity. Variability of ionospheric parameters during solar minimum and maximum activity and assessment of iri model d k sharma a , malini aggarwal b , ananna bardhan a.