NOPR Collection:

Validation of the riometer antenna with position of the sun as a point source

2016-10-24T10:04:19Z

Title: Validation of the riometer antenna with position of the sun as a point source Authors: Sarma, S B S S Abstract: Antenna validation in general, is a cumbersome process involving flights over the antenna site using an airborne transmitter. The sun's (point source at meter wavelengths) enhanced radiation during the disturbed periods has successfully been made use of to validate the riometer antenna power pattern to make it simpler. Page(s): 415-416

Cosmic ray response to CMEs related with solar flares and coronal holes

2016-10-24T10:02:57Z

Title: Cosmic ray response to CMEs related with solar flares and coronal holes Authors: Sharma, N K; Yadav, R S; Agrawal, S P Abstract: The results of an analysis of the associations of coronal mass ejections (CMEs) with solar flares and coronal holes are presented. The above associations are examined by assuming that the cosmic ray response to the CMEs related with solar flares and coronal holes should be different, and found that the association of CMEs and solar flare is insignificant. Page(s): 413-414

Fluctuations in the IMF and related changes in the low latitude horizontal component of geomagnetic field

2016-10-24T10:01:07Z

Title: Fluctuations in the IMF and related changes in the low latitude horizontal component of geomagnetic field Authors: Varma, V K Meena; Nayar, S R Prabhakaran; Somayajulu, V V Abstract: The behaviour of the fluctuations in the horizontal component of geomagnetic field (H) during two magnetic storms has been studied by selecting stations in different latitudes around the globe. The fluctuating component in the dawn-dusk electric field and D_st are also compared with the H component fluctuation during these events. A strong fluctuating component with a period of about 3-4 h is discernible the interplanetary magnetlc field and the geomagnetic field variations. Page(s): 409-412

Study of ionospheric E- and F-region drifts over Patiala

2016-10-24T09:58:57Z

Title: Study of ionospheric E- and F-region drifts over Patiala Authors: Singh, Darshan; Gurm, H S; Singh, Manjit Abstract: Results of the daytime E-region and nighttime F-region drifts obtained by similar fade method over Patiala are presented for the period 1987-90. The E-region drift speed is highest (77 ms^-1) during spring and lowest (59 ms^-1) in summer, while the F-region drift speed is highest (82 ms^-1) during summer and minimum (61 ms^-1) in winter. Drift speed is slightly lower during 1989-90 in comparison to the year 1987-88 for all seasons. Significant diurnal variations of the E- and F-region drifts speed and direction are also observed. Drift speed and direction observed over Patiala are comparable to the observations at low and midlatitude stations, but not consistent with the observations at stations situated within the equatorial electrojet region and at high latitudes. Page(s): 401-408