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Today's Meteor Activity
The 'Today's Meteor Activity' graphic shows the averaged daily Meteor Activity provided by the Radio Meteor Observing Bulletin (RMOB). It's updated every hour. This graphic is free for linking to from your own website by using this link https://mmmonvhf.de/ms/ms.png
UPCOMING METEOR SHOWERS: AUGUST 2018
Now it's the time for one of the most popular meteor showers: the Perseids. Although this shower has proven to be very dynamic in recent years, (especially in the 1990s, due to the perihelion passage of their parent comet, 109P/Swift-Tuttle in 1992, having orbital period of about 130 years) more recently the meteor activity was mostly concentrated around the "normal" peak, with ZHR around 100 hr-1. However, the crossing of some dense streams has led to enhanced activity in several years (like 2016 for example). Such peaks are not to be expected for 2018 return.
Recent IMO observations found that timing of "traditional" broad maximum varied between λsol=139.8 deg to 140.3 deg, equivalent to 2018 August 12, 20h UT to August 13, 08h UT. Node is at λsol=140.0-140.1 degs.
According to IMO, then the maximum in 2018 is expected to occur on August 13, most likely around 02 UT, with ZHR = 110 hr-1.
A possible encounter with a Perseid filament is announced for August 12 around 20h UT (λsol=139.79 degs) by Peter Jenniskens; this filament is thought to be an accumulation of meteoroids in a mean-motion resonance.
An additional potential enhancement, due to a very old dust trail, on August 13 at 01h37m UT, is suggested by Jeremie Vaubaillon, but may give only negligible rates and thus pass unnoticed within the normal maximum period.
Of course, some minor showers will also be active in August, κ-Cygnids, daylight γ-Leonids and Aurigids being the most significant.
Last but not least, don't forget the great help given by Sporadic Meteors: their rates are very close to annual maximum in August.
For Radio Observers, the (Theoretical) UT peaks for upcoming showers in August 2018 are as follows:
Active: July 17 - August 24
Maximum: August 12, 20h UT to August 13, 08h UT (node at λsol= 140.0 - 140.1 deg)
ZHR: HIGH (110 hr-1)
Active: August 03 - August 25
Maximum: August 18 (λsol= 145 deg)
γ-Leonids (Daytime shower)
Active: August 14 - September 12
Maximum: August 25 (λsol= 152.2 deg)
Some tips about Perseids:
The Perseids Radiant is circumpolar (that means, is above horizon the entire day) for every observer northern of about 32 degs N latitude during shower activity.
For a Central Europe observer (say, in JN59 square and surroundings) the radiant is relatively low above horizon in late afternoon/early evening (15-18 UT) and rather high above horizon in early morning (03-06 UT). Optimal height of radiant above horizon for best radio efficiency can be found between 21 UT and 01 UT, and between 08 UT and 12 UT.
For the Central Europe observer mentioned above, the relative radiant position favors the radio paths in NE/SW direction in morning and early afternoon hours, and NW/SE direction during night hours. Best geometric efficiency direction Vs. Time around Perseids maximum can thus be summarized as follows:
Direction of radio path vs. Time for best efficiency (UT)
N/S: 8 - 11 and 23 - 02
NE/SW: 8 - 13
E/W: 10 - 13 and 20 - 23
NW/SE: 20 - 02
This calculation is valid for the center Europe observer as mentioned. Moving significantly away from that area will somewhat change the times for best efficiency, so this table should be used only for an approximate evaluation (although somehow valid for most Europe). Check your actual directions for best efficiency Vs. Time for your area, using tools like Virgo, OH5IY soft and so on. Please note that the above calculated efficiency applies better on Underdense trails ( that produce Pings), while Overdense trails ( that produce longer Bursts) are somewhat less dependent by geometry (radiant position with respect to direction of radio path).